diff --git a/.eslintrc b/.eslintrc
index 24f9ab5..6ec6205 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -47,6 +47,7 @@
     "no-var": "error",
     "prefer-const": "error",
     "no-trailing-spaces": "error",
-    "react/prop-types": 0
+    "react/prop-types": 0,
+    "max-len": [1, {"ignoreStrings": true}]
   }
 }
\ No newline at end of file
diff --git a/components/chart/chart.js b/components/chart/chart.js
index 32983c1..30ed5d7 100644
--- a/components/chart/chart.js
+++ b/components/chart/chart.js
@@ -11,11 +11,12 @@ import Svg,{
 } from 'react-native-svg'
 import { LocalDate } from 'js-joda'
 import { getCycleDay, getOrCreateCycleDay, cycleDaysSortedByDate } from '../../db'
-import getCycleDayNumberModule from '../../lib/get-cycle-day-number'
+import cycleModule from '../../lib/cycle'
 import styles from './styles'
 import config from './config'
+import { getCycleStatusForDay } from '../../lib/sympto-adapter'
 
-const getCycleDayNumber = getCycleDayNumberModule()
+const getCycleDayNumber = cycleModule().getCycleDayNumber
 
 const yAxis = makeYAxis(config)
 
@@ -63,13 +64,29 @@ export default class CycleChart extends Component {
     const cycleDayNumber = getCycleDayNumber(dateString)
     const label = styles.column.label
     const dateLabel = dateString.split('-').slice(1).join('-')
+    const getFhmAndLtlInfo = setUpFertilityStatusFunc()
+    const nfpLineInfo = getFhmAndLtlInfo(dateString, cycleDay)
 
     return (
       <G onPress={() => this.passDateToDayView(dateString)}>
         <Rect {...styles.column.rect} />
+        {nfpLineInfo.drawFhmLine ?
+          <Line
+            x1={0 + styles.nfpLine.strokeWidth / 2}
+            y1="20"
+            x2={0 + styles.nfpLine.strokeWidth / 2}
+            y2={config.chartHeight - 20}
+            {...styles.nfpLine}
+          /> : null}
+
         {this.placeHorizontalGrid()}
-        <Text {...label.number} y={config.cycleDayNumberRowY}>{cycleDayNumber}</Text>
-        <Text {...label.date} y={config.dateRowY}>{dateLabel}</Text>
+
+        <Text {...label.number} y={config.cycleDayNumberRowY}>
+          {cycleDayNumber}
+        </Text>
+        <Text {...label.date} y={config.dateRowY}>
+          {dateLabel}
+        </Text>
 
         {cycleDay && cycleDay.bleeding ?
           <Path {...styles.bleedingIcon}
@@ -79,10 +96,23 @@ export default class CycleChart extends Component {
               Q13.5 6.8 15 3z" />
           : null}
 
+        {nfpLineInfo.drawLtlAt ?
+          <Line
+            x1="0"
+            y1={nfpLineInfo.drawLtlAt}
+            x2={config.columnWidth}
+            y2={nfpLineInfo.drawLtlAt}
+            {...styles.nfpLine}
+          /> : null}
+
+        {y ?
+          this.drawDotAndLines(y, cycleDay.temperature.exclude, index)
+          : null
+        }
         {cycleDay && cycleDay.mucus ?
           <Circle
             {...styles.mucusIcon}
-            fill={styles.mucusIconShades[cycleDay.mucus.computedNfp]}
+            fill={styles.mucusIconShades[cycleDay.mucus.value]}
           /> : null}
 
         {y ? this.drawDotAndLines(y, cycleDay.temperature.exclude, index) : null}
@@ -181,15 +211,18 @@ function makeColumnInfo(n) {
 
 function getPreviousDays(n) {
   const today = new Date()
-  today.setHours(0); today.setMinutes(0); today.setSeconds(0); today.setMilliseconds(0)
+  today.setHours(0)
+  today.setMinutes(0)
+  today.setSeconds(0)
+  today.setMilliseconds(0)
   const earlierDate = new Date(today - (range.DAY * n))
 
   return range(earlierDate, today).reverse()
 }
 
 function normalizeToScale(temp) {
-  const temperatureScale = config.temperatureScale
-  const valueRelativeToScale = (temperatureScale.high - temp) / (temperatureScale.high - temperatureScale.low)
+  const scale = config.temperatureScale
+  const valueRelativeToScale = (scale.high - temp) / (scale.high - scale.low)
   const scaleHeight = config.chartHeight
   return scaleHeight * valueRelativeToScale
 }
@@ -202,7 +235,6 @@ function makeYAxis() {
 
   const tickPositions = []
   const labels = []
-
   // for style reasons, we don't want the first and last tick
   for (let i = 1; i < numberOfTicks - 1; i++) {
     const y = tickDistance * i
@@ -223,3 +255,79 @@ function makeYAxis() {
 
   return {labels, tickPositions}
 }
+
+function setUpFertilityStatusFunc() {
+  let cycleStatus
+  let cycleStartDate
+  let noMoreCycles = false
+
+  function updateCurrentCycle(dateString) {
+    cycleStatus = getCycleStatusForDay(dateString)
+    if(!cycleStatus) {
+      noMoreCycles = true
+      return
+    }
+    if (cycleStatus.phases.preOvulatory) {
+      cycleStartDate = cycleStatus.phases.preOvulatory.start.date
+    } else {
+      cycleStartDate = cycleStatus.phases.periOvulatory.start.date
+    }
+  }
+
+  function dateIsInPeriOrPostPhase(dateString) {
+    return (
+      dateString >= cycleStatus.phases.periOvulatory.start.date
+    )
+  }
+
+  function precededByAnotherTempValue(dateString) {
+    return (
+      // we are only interested in days that have a preceding
+      // temp
+      Object.keys(cycleStatus.phases).some(phaseName => {
+        return cycleStatus.phases[phaseName].cycleDays.some(day => {
+          return day.temperature && day.date < dateString
+        })
+      })
+      // and also a following temp, so we don't draw the line
+      // longer than necessary
+      &&
+      cycleStatus.phases.postOvulatory.cycleDays.some(day => {
+        return day.temperature && day.date > dateString
+      })
+    )
+  }
+
+  function isInTempMeasuringPhase(cycleDay, dateString) {
+    return (
+      cycleDay && cycleDay.temperature
+      || precededByAnotherTempValue(dateString)
+    )
+  }
+
+  return function(dateString, cycleDay) {
+    const ret = {}
+    if (!cycleStatus && !noMoreCycles) updateCurrentCycle(dateString)
+    if (noMoreCycles) return ret
+
+    if (dateString < cycleStartDate) updateCurrentCycle(dateString)
+    if (noMoreCycles) return ret
+
+    const tempShift = cycleStatus.temperatureShift
+
+    if (tempShift) {
+      if (tempShift.firstHighMeasurementDay.date === dateString) {
+        ret.drawFhmLine = true
+      }
+
+      if (
+        dateIsInPeriOrPostPhase(dateString) &&
+        isInTempMeasuringPhase(cycleDay, dateString)
+      ) {
+        ret.drawLtlAt = normalizeToScale(tempShift.ltl)
+      }
+    }
+
+    return ret
+  }
+}
\ No newline at end of file
diff --git a/components/chart/styles.js b/components/chart/styles.js
index 4e06b73..8c2ab2e 100644
--- a/components/chart/styles.js
+++ b/components/chart/styles.js
@@ -74,6 +74,10 @@ const styles = {
   horizontalGrid: {
     stroke: 'lightgrey',
     strokeWidth: 1
+  },
+  nfpLine: {
+    stroke: '#00b159',
+    strokeWidth: 3
   }
 }
 
diff --git a/components/cycle-day/cycle-day-overview.js b/components/cycle-day/cycle-day-overview.js
index c2730d1..094bc65 100644
--- a/components/cycle-day/cycle-day-overview.js
+++ b/components/cycle-day/cycle-day-overview.js
@@ -14,10 +14,10 @@ import {
   cervixFirmness as firmnessLabels,
   cervixPosition as positionLabels
 } from './labels/labels'
-import cycleDayModule from '../../lib/get-cycle-day-number'
+import cycleDayModule from '../../lib/cycle'
 import { bleedingDaysSortedByDate } from '../../db'
 
-const getCycleDayNumber = cycleDayModule()
+const getCycleDayNumber = cycleDayModule().getCycleDayNumber
 
 export default class DayView extends Component {
   constructor(props) {
@@ -72,7 +72,7 @@ export default class DayView extends Component {
     if (this.cycleDay.mucus) {
       const mucus = this.cycleDay.mucus
       if (typeof mucus.feeling === 'number' && typeof mucus.texture === 'number') {
-        mucusLabel = `${feelingLabels[mucus.feeling]} + ${textureLabels[mucus.texture]} ( ${computeSensiplanMucusLabels[mucus.computedNfp]} )`
+        mucusLabel = `${feelingLabels[mucus.feeling]} + ${textureLabels[mucus.texture]} ( ${computeSensiplanMucusLabels[mucus.value]} )`
         if (mucus.exclude) mucusLabel = "( " + mucusLabel + " )"
       }
     } else {
diff --git a/components/cycle-day/index.js b/components/cycle-day/index.js
index 3d2ffde..e0eb666 100644
--- a/components/cycle-day/index.js
+++ b/components/cycle-day/index.js
@@ -4,7 +4,8 @@ import {
   Text,
   ScrollView
 } from 'react-native'
-import cycleDayModule from '../../lib/get-cycle-day-number'
+import cycleModule from '../../lib/cycle'
+import { getFertilityStatusStringForDay } from '../../lib/sympto-adapter'
 import DayView from './cycle-day-overview'
 import BleedingEditView from './symptoms/bleeding'
 import TemperatureEditView from './symptoms/temperature'
@@ -14,7 +15,7 @@ import CervixEditView from './symptoms/cervix'
 import styles from '../../styles'
 import actionButtonModule from './action-buttons'
 
-const getCycleDayNumber = cycleDayModule()
+const getCycleDayNumber = cycleModule().getCycleDayNumber
 
 export default class Day extends Component {
   constructor(props) {
@@ -34,6 +35,7 @@ export default class Day extends Component {
 
   render() {
     const cycleDayNumber = getCycleDayNumber(this.cycleDay.date)
+    const fertilityStatus = getFertilityStatusStringForDay(this.cycleDay.date)
     return (
       <ScrollView>
         <View style={ styles.cycleDayDateView }>
@@ -42,7 +44,14 @@ export default class Day extends Component {
           </Text>
         </View >
         <View style={ styles.cycleDayNumberView }>
-          { cycleDayNumber && <Text style={styles.cycleDayNumber} >Cycle day {cycleDayNumber}</Text> }
+          { cycleDayNumber &&
+            <Text style={styles.cycleDayNumber} >
+              Cycle day {cycleDayNumber}
+            </Text> }
+
+          <Text style={styles.cycleDayNumber} >
+            {fertilityStatus}
+          </Text>
         </View >
         <View>
           {
diff --git a/components/cycle-day/labels/labels.js b/components/cycle-day/labels/labels.js
index 25909df..6e294ef 100644
--- a/components/cycle-day/labels/labels.js
+++ b/components/cycle-day/labels/labels.js
@@ -1,17 +1,14 @@
-const bleeding = ['spotting', 'light', 'medium', 'heavy']
-const mucusFeeling = ['dry', 'nothing', 'wet', 'slippery']
-const mucusTexture = ['nothing', 'creamy', 'egg white']
-const mucusNFP = ['t', 'Ø', 'f', 'S', '+S']
-const cervixOpening = ['closed', 'medium', 'open']
-const cervixFirmness = ['hard', 'soft']
-const cervixPosition = ['low', 'medium', 'high']
+export const bleeding = ['spotting', 'light', 'medium', 'heavy']
+export const mucusFeeling = ['dry', 'nothing', 'wet', 'slippery']
+export const mucusTexture = ['nothing', 'creamy', 'egg white']
+export const mucusNFP = ['t', 'Ø', 'f', 'S', '+S']
+export const cervixOpening = ['closed', 'medium', 'open']
+export const cervixFirmness = ['hard', 'soft']
+export const cervixPosition = ['low', 'medium', 'high']
 
-export {
-  bleeding,
-  mucusFeeling,
-  mucusTexture,
-  mucusNFP,
-  cervixOpening,
-  cervixFirmness,
-  cervixPosition
-}
+export const fertilityStatus = {
+  fertile: 'fertile',
+  infertile: 'infertile',
+  fertileUntilEvening: 'Fertile phase ends in the evening',
+  unknown: 'We cannot show any cycle information because no menses has been entered'
+}
\ No newline at end of file
diff --git a/components/cycle-day/symptoms/mucus.js b/components/cycle-day/symptoms/mucus.js
index 4a090d2..abafe56 100644
--- a/components/cycle-day/symptoms/mucus.js
+++ b/components/cycle-day/symptoms/mucus.js
@@ -94,7 +94,7 @@ export default class Mucus extends Component {
                 saveSymptom('mucus', this.cycleDay, {
                   feeling: this.state.feeling,
                   texture: this.state.texture,
-                  computedNfp: computeSensiplanValue(this.state.feeling, this.state.texture),
+                  value: computeSensiplanValue(this.state.feeling, this.state.texture),
                   exclude: this.state.exclude
                 })
               },
diff --git a/components/home.js b/components/home.js
index fa62ad7..48af5f5 100644
--- a/components/home.js
+++ b/components/home.js
@@ -6,11 +6,11 @@ import {
   ScrollView
 } from 'react-native'
 import { LocalDate } from 'js-joda'
-import styles from '../styles'
-import cycleDayModule from '../lib/get-cycle-day-number'
-import { getOrCreateCycleDay, bleedingDaysSortedByDate, deleteAll } from '../db'
+import styles from '../styles/index'
+import cycleModule from '../lib/cycle'
+import { getOrCreateCycleDay, bleedingDaysSortedByDate, fillWithDummyData, deleteAll } from '../db'
 
-const getCycleDayNumber = cycleDayModule()
+const getCycleDayNumber = cycleModule().getCycleDayNumber
 
 export default class Home extends Component {
   constructor(props) {
@@ -68,6 +68,12 @@ export default class Home extends Component {
               title="Go to chart">
             </Button>
           </View>
+          <View style={styles.homeButton}>
+            <Button
+              onPress={() => fillWithDummyData()}
+              title="fill with example data">
+            </Button>
+          </View>
           <View style={styles.homeButton}>
             <Button
               onPress={() => deleteAll()}
diff --git a/db/fixtures.js b/db/fixtures.js
new file mode 100644
index 0000000..a9075f7
--- /dev/null
+++ b/db/fixtures.js
@@ -0,0 +1,73 @@
+function convertToSymptoFormat(val) {
+  const sympto = { date: val.date }
+  if (val.temperature) sympto.temperature = { value: val.temperature, exclude: false }
+  if (val.mucus) sympto.mucus = {
+    value: val.mucus,
+    exclude: false,
+    feeling: val.mucus,
+    texture: val.mucus
+  }
+  if (val.bleeding) sympto.bleeding = { value: val.bleeding, exclude: false }
+  return sympto
+}
+
+export const cycleWithFhm = [
+  { date: '2018-07-01', bleeding: 2 },
+  { date: '2018-07-02', bleeding: 1 },
+  { date: '2018-07-06', temperature: 36.2},
+  { date: '2018-07-07', temperature: 36.35 },
+  { date: '2018-07-09', temperature: 36.6 },
+  { date: '2018-07-10', temperature: 36.45 },
+  { date: '2018-07-12', temperature: 36.7, mucus: 0 },
+  { date: '2018-07-13', temperature: 36.8, mucus: 4 },
+  { date: '2018-07-15', temperature: 36.9, mucus: 2 },
+  { date: '2018-07-16', temperature: 36.95, mucus: 2 },
+  { date: '2018-07-17', temperature: 36.9, mucus: 2 },
+  { date: '2018-07-18', temperature: 36.9, mucus: 2 }
+].map(convertToSymptoFormat).reverse()
+
+export const longAndComplicatedCycle = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65 },
+  { date: '2018-06-04', temperature: 36.6 },
+  { date: '2018-06-05', temperature: 36.55 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-09', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-10', temperature: 36.4, mucus: 2 },
+  { date: '2018-06-13', temperature: 36.45, mucus: 3 },
+  { date: '2018-06-14', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-15', temperature: 36.55, mucus: 4 },
+  { date: '2018-06-16', temperature: 36.7, mucus: 3 },
+  { date: '2018-06-17', temperature: 36.65, mucus: 3 },
+  { date: '2018-06-18', temperature: 36.75, mucus: 4 },
+  { date: '2018-06-19', temperature: 36.8, mucus: 1 },
+  { date: '2018-06-20', temperature: 36.85, mucus: 2 },
+  { date: '2018-06-21', temperature: 36.8, mucus: 2 },
+  { date: '2018-06-22', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-25', temperature: 36.9, mucus: 1 },
+  { date: '2018-06-26', temperature: 36.8, mucus: 1 },
+  { date: '2018-06-27', temperature: 36.9, mucus: 1 }
+].map(convertToSymptoFormat).reverse()
+
+export const cycleWithTempAndNoMucusShift = [
+  { date: '2018-05-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-05-02', temperature: 36.65 },
+  { date: '2018-05-05', temperature: 36.55 },
+  { date: '2018-05-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-05-08', temperature: 36.45, mucus: 1 },
+  { date: '2018-05-09', temperature: 36.5, mucus: 4 },
+  { date: '2018-05-10', temperature: 36.4, mucus: 2 },
+  { date: '2018-05-11', temperature: 36.5, mucus: 3 },
+  { date: '2018-05-13', temperature: 36.45, mucus: 3 },
+  { date: '2018-05-14', temperature: 36.5, mucus: 4 },
+  { date: '2018-05-15', temperature: 36.55, mucus: 4 },
+  { date: '2018-05-16', temperature: 36.7, mucus: 3 },
+  { date: '2018-05-17', temperature: 36.65, mucus: 3 },
+  { date: '2018-05-18', temperature: 36.75, mucus: 4 },
+  { date: '2018-05-19', temperature: 36.8, mucus: 4 },
+  { date: '2018-05-20', temperature: 36.85, mucus: 4 },
+  { date: '2018-05-23', temperature: 36.9, mucus: 3 },
+  { date: '2018-05-24', temperature: 36.85, mucus: 4 },
+  { date: '2018-05-26', temperature: 36.8, mucus: 4 },
+  { date: '2018-05-27', temperature: 36.9, mucus: 4 }
+].map(convertToSymptoFormat).reverse()
\ No newline at end of file
diff --git a/db.js b/db/index.js
similarity index 77%
rename from db.js
rename to db/index.js
index 6fb743d..ed3e275 100644
--- a/db.js
+++ b/db/index.js
@@ -1,6 +1,10 @@
 import Realm from 'realm'
 import { LocalDate } from 'js-joda'
-
+import {
+  cycleWithTempAndNoMucusShift,
+  cycleWithFhm,
+  longAndComplicatedCycle
+} from './fixtures'
 
 const TemperatureSchema = {
   name: 'Temperature',
@@ -27,7 +31,7 @@ const MucusSchema = {
   properties: {
     feeling: 'int',
     texture: 'int',
-    computedNfp: 'int',
+    value: 'int',
     exclude: 'bool'
   }
 }
@@ -66,7 +70,7 @@ const CycleDaySchema = {
   }
 }
 
-const db = new Realm({
+const realmConfig = {
   schema: [
     CycleDaySchema,
     TemperatureSchema,
@@ -76,7 +80,9 @@ const db = new Realm({
   ],
   // we only want this in dev mode
   deleteRealmIfMigrationNeeded: true
-})
+}
+
+const db = new Realm(realmConfig)
 
 const bleedingDaysSortedByDate = db.objects('CycleDay').filtered('bleeding != null').sorted('date', true)
 const temperatureDaysSortedByDate = db.objects('CycleDay').filtered('temperature != null').sorted('date', true)
@@ -105,6 +111,31 @@ function getCycleDay(localDate) {
   return db.objectForPrimaryKey('CycleDay', localDate)
 }
 
+function fillWithDummyData() {
+  const dummyCycles = [
+    cycleWithFhm,
+    longAndComplicatedCycle,
+    cycleWithTempAndNoMucusShift
+  ]
+
+  db.write(() => {
+    db.deleteAll()
+    dummyCycles.forEach(cycle => {
+      cycle.forEach(day => {
+        const existing = getCycleDay(day.date)
+        if (existing) {
+          Object.keys(day).forEach(key => {
+            if (key === 'date') return
+            existing[key] = day[key]
+          })
+        } else {
+          db.create('CycleDay', day)
+        }
+      })
+    })
+  })
+}
+
 function deleteAll() {
   db.write(() => {
     db.deleteAll()
@@ -127,6 +158,7 @@ export {
   bleedingDaysSortedByDate,
   temperatureDaysSortedByDate,
   cycleDaysSortedByDate,
+  fillWithDummyData,
   deleteAll,
   getPreviousTemperature,
   getCycleDay
diff --git a/lib/cycle.js b/lib/cycle.js
new file mode 100644
index 0000000..f60a74f
--- /dev/null
+++ b/lib/cycle.js
@@ -0,0 +1,129 @@
+import * as joda from 'js-joda'
+const LocalDate = joda.LocalDate
+
+
+export default function config(opts) {
+  let bleedingDaysSortedByDate
+  let cycleDaysSortedByDate
+  let maxBreakInBleeding
+
+  if (!opts) {
+    // we only want to require (and run) the db module
+    // when not running the tests
+    bleedingDaysSortedByDate = require('../db').bleedingDaysSortedByDate
+    cycleDaysSortedByDate = require('../db').cycleDaysSortedByDate
+    maxBreakInBleeding = 1
+  } else {
+    bleedingDaysSortedByDate = opts.bleedingDaysSortedByDate || []
+    cycleDaysSortedByDate = opts.cycleDaysSortedByDate || []
+    maxBreakInBleeding = opts.maxBreakInBleeding || 1
+  }
+
+  function getLastMensesStart(targetDateString) {
+    const targetDate = LocalDate.parse(targetDateString)
+    const withWrappedDates = bleedingDaysSortedByDate
+      .filter(day => !day.bleeding.exclude)
+      .map(day => {
+        day.wrappedDate = LocalDate.parse(day.date)
+        return day
+      })
+
+    const firstBleedingDayBeforeTargetDayIndex = withWrappedDates.findIndex(day => {
+      return (
+        day.wrappedDate.isEqual(targetDate) ||
+        day.wrappedDate.isBefore(targetDate)
+      )
+    })
+
+    if (firstBleedingDayBeforeTargetDayIndex < 0) {
+      withWrappedDates.forEach(day => delete day.wrappedDate)
+      return null
+    }
+
+    const previousBleedingDays = withWrappedDates.slice(firstBleedingDayBeforeTargetDayIndex)
+
+    const lastMensesStart = previousBleedingDays.find((day, i) => {
+      return thereIsNoPreviousBleedingDayWithinTheThreshold(day, previousBleedingDays.slice(i + 1))
+    })
+
+    function thereIsNoPreviousBleedingDayWithinTheThreshold(bleedingDay, previousBleedingDays) {
+      const periodThreshold = bleedingDay.wrappedDate.minusDays(maxBreakInBleeding + 1)
+      return !previousBleedingDays.some(({ wrappedDate }) => {
+        return wrappedDate.equals(periodThreshold) || wrappedDate.isAfter(periodThreshold)
+      })
+    }
+
+    withWrappedDates.forEach(day => delete day.wrappedDate)
+    return lastMensesStart
+  }
+
+  function getFollowingMensesStart(targetDateString) {
+    const targetDate = LocalDate.parse(targetDateString)
+    const withWrappedDates = bleedingDaysSortedByDate
+      .filter(day => !day.bleeding.exclude)
+      .map(day => {
+        day.wrappedDate = LocalDate.parse(day.date)
+        return day
+      })
+
+    const firstBleedingDayAfterTargetDay = withWrappedDates.reverse().find(day => {
+      return day.wrappedDate.isAfter(targetDate)
+    })
+
+    withWrappedDates.forEach(day => delete day.wrappedDate)
+
+    return firstBleedingDayAfterTargetDay
+  }
+
+  function getCycleDayNumber(targetDateString) {
+    const lastMensesStart = getLastMensesStart(targetDateString)
+    if (!lastMensesStart) return null
+    const targetDate = LocalDate.parse(targetDateString)
+    const lastMensesLocalDate = LocalDate.parse(lastMensesStart.date)
+    const diffInDays = lastMensesLocalDate.until(targetDate, joda.ChronoUnit.DAYS)
+
+    // cycle starts at day 1
+    return diffInDays + 1
+  }
+
+  function getCyclesBefore(targetCycleStartDay) {
+    return collectPreviousCycles([], targetCycleStartDay.date)
+  }
+
+  function collectPreviousCycles(acc, startOfFollowingCycle) {
+    const cycle = getPreviousCycle(startOfFollowingCycle)
+    if (!cycle || !cycle.length) return acc
+    acc.push(cycle)
+    return collectPreviousCycles(acc, cycle[cycle.length - 1].date)
+  }
+
+  function getPreviousCycle(dateString) {
+    const startOfCycle = getLastMensesStart(dateString)
+    if (!startOfCycle) return null
+    const dateBeforeStartOfCycle = LocalDate.parse(startOfCycle.date).minusDays(1).toString()
+    return getCycleForDay(dateBeforeStartOfCycle)
+  }
+
+  function getCycleForDay(dayOrDate) {
+    const dateString = typeof dayOrDate === 'string' ? dayOrDate : dayOrDate.date
+    const cycleStart = getLastMensesStart(dateString)
+    if (!cycleStart) return null
+    const cycleStartIndex = cycleDaysSortedByDate.indexOf(cycleStart)
+    const nextMensesStart = getFollowingMensesStart(dateString)
+    if (nextMensesStart) {
+      return cycleDaysSortedByDate.slice(
+        cycleDaysSortedByDate.indexOf(nextMensesStart) + 1,
+        cycleStartIndex + 1
+      )
+    } else {
+      return cycleDaysSortedByDate.slice(0, cycleStartIndex + 1)
+    }
+  }
+
+  return {
+    getCycleDayNumber,
+    getCycleForDay,
+    getPreviousCycle,
+    getCyclesBefore
+  }
+}
\ No newline at end of file
diff --git a/lib/get-cycle-day-number.js b/lib/get-cycle-day-number.js
deleted file mode 100644
index d1b056a..0000000
--- a/lib/get-cycle-day-number.js
+++ /dev/null
@@ -1,48 +0,0 @@
-import * as joda from 'js-joda'
-
-const LocalDate = joda.LocalDate
-
-export default function config(opts = {}) {
-  let bleedingDaysSortedByDate
-  if (!opts.bleedingDaysSortedByDate) {
-    // we only want to require (and run) the db module when not running the tests
-    bleedingDaysSortedByDate = require('../db').bleedingDaysSortedByDate
-  } else {
-    bleedingDaysSortedByDate = opts.bleedingDaysSortedByDate
-  }
-  const maxBreakInBleeding = opts.maxBreakInBleeding || 1
-
-  return function getCycleDayNumber(targetDateString) {
-    const targetDate = LocalDate.parse(targetDateString)
-    const withWrappedDates = bleedingDaysSortedByDate
-      .filter(day => !day.bleeding.exclude)
-      .map(day => {
-        day.wrappedDate = LocalDate.parse(day.date)
-        return day
-      })
-
-    const firstBleedingDayBeforeTargetDayIndex = withWrappedDates.findIndex(day => {
-      return (
-        day.wrappedDate.isEqual(targetDate) ||
-        day.wrappedDate.isBefore(targetDate)
-      )
-    })
-
-    if (firstBleedingDayBeforeTargetDayIndex < 0) return null
-    const previousBleedingDays = withWrappedDates.slice(firstBleedingDayBeforeTargetDayIndex)
-
-    const lastPeriodStart = previousBleedingDays.find((day, i) => {
-      return thereIsNoPreviousBleedingDayWithinTheThreshold(day, previousBleedingDays.slice(i + 1), maxBreakInBleeding)
-    })
-
-    const diffInDays = lastPeriodStart.wrappedDate.until(targetDate, joda.ChronoUnit.DAYS)
-
-    // cycle starts at day 1
-    return diffInDays + 1
-  }
-}
-
-function thereIsNoPreviousBleedingDayWithinTheThreshold(bleedingDay, earlierCycleDays, allowedBleedingBreak) {
-  const periodThreshold = bleedingDay.wrappedDate.minusDays(allowedBleedingBreak + 1)
-  return !earlierCycleDays.some(({ wrappedDate }) => wrappedDate.equals(periodThreshold) || wrappedDate.isAfter(periodThreshold))
-}
\ No newline at end of file
diff --git a/lib/sympto-adapter.js b/lib/sympto-adapter.js
new file mode 100644
index 0000000..b6ab217
--- /dev/null
+++ b/lib/sympto-adapter.js
@@ -0,0 +1,69 @@
+import getFertilityStatus from './sympto'
+import cycleModule from './cycle'
+import { fertilityStatus } from '../components/cycle-day/labels/labels'
+
+const {
+  getCycleForDay,
+  getCyclesBefore,
+  getPreviousCycle
+} = cycleModule()
+
+export function getFertilityStatusStringForDay(dateString) {
+  const status = getCycleStatusForDay(dateString)
+  if (!status) return fertilityStatus.unknown
+
+  const phaseNameForDay = Object.keys(status.phases).find(phaseName => {
+    const phase = status.phases[phaseName]
+    const dayIsAfterPhaseStart = dateString >= phase.start.date
+    let dayIsBeforePhaseEnd
+    if (phase.end) {
+      dayIsBeforePhaseEnd = dateString <= phase.end.date
+    } else {
+      dayIsBeforePhaseEnd = true
+    }
+    return dayIsAfterPhaseStart && dayIsBeforePhaseEnd
+  })
+
+  return mapToString(phaseNameForDay, dateString, status)
+}
+
+export function getCycleStatusForDay(dateString) {
+  const cycle = getCycleForDay(dateString)
+  if (!cycle) return null
+
+  const cycleInfo = {cycle: formatCycleForSympto(cycle)}
+
+  const previousCycle = getPreviousCycle(dateString)
+
+  if (previousCycle) {
+    cycleInfo.previousCycle = formatCycleForSympto(previousCycle)
+    const earlierCycles = getCyclesBefore(previousCycle[0])
+    if (earlierCycles) {
+      cycleInfo.earlierCycles = earlierCycles.map(formatCycleForSympto)
+    }
+  }
+
+  return getFertilityStatus(cycleInfo)
+}
+
+function mapToString(phaseNameForDay, dateString, status) {
+  const mapping = {
+    preOvulatory: () => fertilityStatus.infertile,
+    periOvulatory: (dateString, status) => {
+      const phaseEnd = status.phases.periOvulatory.end
+      if (phaseEnd && phaseEnd.date === dateString) {
+        return fertilityStatus.fertileUntilEvening
+      }
+      return fertilityStatus.fertile
+    },
+    postOvulatory: () => fertilityStatus.infertile
+  }
+
+  return mapping[phaseNameForDay](dateString, status)
+}
+
+function formatCycleForSympto(cycle) {
+  // we get earliest last, but sympto wants earliest first
+  cycle.reverse()
+  return cycle
+}
\ No newline at end of file
diff --git a/lib/sympto/index.js b/lib/sympto/index.js
new file mode 100644
index 0000000..b930638
--- /dev/null
+++ b/lib/sympto/index.js
@@ -0,0 +1,102 @@
+import getTemperatureShift from './temperature'
+import getMucusShift from './mucus'
+import getPreOvulatoryPhase from './pre-ovulatory'
+import { LocalDate } from 'js-joda'
+import assert from 'assert'
+
+export default function getSymptoThermalStatus({ cycle, previousCycle, earlierCycles = [] }) {
+  throwIfArgsAreNotInRequiredFormat([cycle, ...earlierCycles])
+
+  const status = {
+    phases: {}
+  }
+
+  // if there was no first higher measurement in the previous cycle,
+  // no infertile pre-ovulatory phase may be assumed
+  if (previousCycle) {
+    const statusForLast = getSymptoThermalStatus({ cycle: previousCycle })
+    if (statusForLast.temperatureShift) {
+      const preOvuPhase = getPreOvulatoryPhase(
+        cycle,
+        [previousCycle, ...earlierCycles]
+      )
+      if (preOvuPhase) {
+        status.phases.preOvulatory = preOvuPhase
+        if (status.phases.preOvulatory.cycleDays.length === cycle.length) {
+          return status
+        }
+      }
+    }
+  }
+
+  status.phases.periOvulatory = {
+    start: { date: null },
+    cycleDays: []
+  }
+  const periPhase = status.phases.periOvulatory
+
+  if (status.phases.preOvulatory) {
+    const prePhase = status.phases.preOvulatory
+    const startDate = LocalDate.parse(prePhase.end.date).plusDays(1).toString()
+    periPhase.start.date = startDate
+    const lastPreDay = prePhase.cycleDays[prePhase.cycleDays.length - 1]
+    periPhase.cycleDays = cycle.slice(cycle.indexOf(lastPreDay) + 1)
+  } else {
+    periPhase.start.date = cycle[0].date
+    periPhase.cycleDays = [...cycle]
+  }
+
+  const temperatureShift = getTemperatureShift(cycle)
+  if (!temperatureShift.detected) return status
+
+  const tempEvalEndIndex = cycle.indexOf(temperatureShift.evaluationCompleteDay)
+  const mucusShift = getMucusShift(cycle, tempEvalEndIndex)
+  if (!mucusShift.detected) return status
+
+  let periOvulatoryEnd
+  const tempOver = temperatureShift.evaluationCompleteDay.date
+  const mucusOver = mucusShift.evaluationCompleteDay.date
+
+  if (tempOver > mucusOver) {
+    periOvulatoryEnd = temperatureShift.evaluationCompleteDay
+  } else {
+    periOvulatoryEnd = mucusShift.evaluationCompleteDay
+  }
+
+  const previousPeriDays = periPhase.cycleDays
+  const previousPeriEndIndex = previousPeriDays.indexOf(periOvulatoryEnd)
+
+  status.phases.postOvulatory = {
+    start: {
+      date: periOvulatoryEnd.date,
+      time: '18:00'
+    },
+    cycleDays: previousPeriDays.slice(previousPeriEndIndex)
+  }
+
+  periPhase.cycleDays = previousPeriDays.slice(0, previousPeriEndIndex + 1)
+  periPhase.end = status.phases.postOvulatory.start
+
+  status.mucusShift = mucusShift
+  status.temperatureShift = temperatureShift
+
+  return status
+}
+
+function throwIfArgsAreNotInRequiredFormat(cycles) {
+  cycles.forEach(cycle => {
+    assert.ok(Array.isArray(cycle))
+    assert.ok(cycle.length > 0)
+    assert.ok(cycle[0].bleeding !== null)
+    assert.equal(typeof cycle[0].bleeding, 'object')
+    assert.equal(typeof cycle[0].bleeding.value, 'number')
+    cycle.forEach(day => {
+      assert.equal(typeof day.date, 'string')
+      assert.doesNotThrow(() => LocalDate.parse(day.date))
+      if (day.temperature) assert.equal(typeof day.temperature.value, 'number')
+      if (day.mucus) assert.equal(typeof day.mucus.value, 'number')
+      if (day.mucus) assert.ok(day.mucus.value >= 0)
+      if (day.mucus) assert.ok(day.mucus.value < 5)
+    })
+  })
+}
\ No newline at end of file
diff --git a/lib/sympto/minus-8-day-rule.js b/lib/sympto/minus-8-day-rule.js
new file mode 100644
index 0000000..2964b37
--- /dev/null
+++ b/lib/sympto/minus-8-day-rule.js
@@ -0,0 +1,26 @@
+import { LocalDate } from 'js-joda'
+import getNfpStatus from './index'
+
+export default function (previousCycles) {
+  const fhms = previousCycles
+    .map(cycle => {
+      const status = getNfpStatus({ cycle })
+      if (status.temperatureShift) {
+        const day = status.temperatureShift.firstHighMeasurementDay
+        const firstCycleDayDate = LocalDate.parse(cycle[0].date)
+        const fhmDate = LocalDate.parse(day.date)
+        return fhmDate.compareTo(firstCycleDayDate) + 1
+      }
+      return null
+    })
+    .filter(val => typeof val === 'number')
+
+  const preOvuLength = Math.min(...fhms) - 8
+
+  // pre ovu length may only be lengthened if we have more than 12 previous fhms
+  // if pre ovu length is less than 5, it shortened even with fewer prev fhms
+  if (preOvuLength < 5) return preOvuLength
+  if (fhms.length >= 12) return preOvuLength
+
+  return null
+}
\ No newline at end of file
diff --git a/lib/sympto/mucus.js b/lib/sympto/mucus.js
new file mode 100644
index 0000000..9eb37ef
--- /dev/null
+++ b/lib/sympto/mucus.js
@@ -0,0 +1,40 @@
+export default function (cycleDays, tempEvalEndIndex) {
+  const mucusDays = cycleDays.filter(day => day.mucus && !day.mucus.exclude)
+  const bestQuality = Math.max(...mucusDays.map(day => day.mucus.value))
+
+  for (let i = 0; i < mucusDays.length; i++) {
+    const day = mucusDays[i]
+    if (day.mucus.value !== bestQuality) continue
+
+    // the three following days must be of lower quality
+    // AND no best quality day may occur until temperature evaluation has
+    // been completed
+    const threeFollowingDays = mucusDays.slice(i + 1, i + 4)
+    if (threeFollowingDays.length < 3) continue
+
+    const bestQualityOccursIn3FollowingDays = threeFollowingDays.some(day => {
+      return day.mucus.value >= bestQuality
+    })
+    if (bestQualityOccursIn3FollowingDays) continue
+
+    const cycleDayIndex = cycleDays.indexOf(day)
+    const relevantDays = cycleDays
+      .slice(cycleDayIndex + 1, tempEvalEndIndex + 1)
+      .filter(day => day.mucus && !day.mucus.exclude)
+
+    const noBestQualityUntilEndOfTempEval = relevantDays.every(day => {
+      return day.mucus.value < bestQuality
+    })
+
+    if (noBestQualityUntilEndOfTempEval) {
+      return {
+        detected: true,
+        mucusPeak: day,
+        evaluationCompleteDay: threeFollowingDays[threeFollowingDays.length - 1]
+      }
+    }
+  }
+
+  return { detected: false }
+}
+
diff --git a/lib/sympto/pre-ovulatory.js b/lib/sympto/pre-ovulatory.js
new file mode 100644
index 0000000..b1e7698
--- /dev/null
+++ b/lib/sympto/pre-ovulatory.js
@@ -0,0 +1,46 @@
+import { LocalDate } from "js-joda"
+import apply8DayRule from './minus-8-day-rule'
+
+export default function(cycle, previousCycles) {
+  let preOvuPhaseLength = 5
+
+  const minus8DayRuleResult = apply8DayRule(previousCycles)
+  if (minus8DayRuleResult) preOvuPhaseLength = minus8DayRuleResult
+
+  const startDate = LocalDate.parse(cycle[0].date)
+  const preOvuEndDate = startDate.plusDays(preOvuPhaseLength - 1).toString()
+  const maybePreOvuDays = cycle.slice(0, preOvuPhaseLength).filter(d => {
+    return d.date <= preOvuEndDate
+  })
+  const preOvulatoryDays = getDaysUntilFertileMucus(maybePreOvuDays)
+  // if mucus occurs on the 1st cycle day, there is no pre-ovu phase
+  if (!preOvulatoryDays.length) return null
+
+  let endDate
+  if (preOvulatoryDays.length === maybePreOvuDays.length) {
+    endDate = preOvuEndDate
+  } else {
+    endDate = preOvulatoryDays[preOvulatoryDays.length - 1].date
+  }
+
+  return {
+    cycleDays: preOvulatoryDays,
+    start: {
+      date: preOvulatoryDays[0].date
+    },
+    end: {
+      date: endDate
+    }
+  }
+}
+
+function getDaysUntilFertileMucus(days) {
+  const firstFertileMucusDayIndex = days.findIndex(day => {
+    return day.mucus && day.mucus.value > 1
+  })
+
+  if (firstFertileMucusDayIndex > -1) {
+    return days.slice(0, firstFertileMucusDayIndex)
+  }
+  return days
+}
\ No newline at end of file
diff --git a/lib/sympto/temperature.js b/lib/sympto/temperature.js
new file mode 100644
index 0000000..387cd63
--- /dev/null
+++ b/lib/sympto/temperature.js
@@ -0,0 +1,106 @@
+export default function (cycleDays) {
+  const temperatureDays = cycleDays
+    .filter(day => day.temperature && !day.temperature.exclude)
+    .map(day => {
+      return {
+        originalCycleDay: day,
+        temp: rounded(day.temperature.value, 0.05)
+      }
+    })
+
+  function getLtl(i) {
+    const daysBefore = temperatureDays.slice(0, i).slice(-6)
+    const temps = daysBefore.map(day => day.temp)
+    return Math.max(...temps)
+  }
+
+  for (let i = 0; i < temperatureDays.length; i++) {
+    // need at least 6 low temps before we can detect a first high measurement
+    if (i < 6) continue
+
+    // is the temp a candidate for a first high measurement?
+    const ltl = getLtl(i)
+    const temp = temperatureDays[i].temp
+    if (temp <= ltl) continue
+
+    const shift = checkIfFirstHighMeasurement(temp, i, temperatureDays, ltl)
+
+    if (shift.detected) {
+      shift.firstHighMeasurementDay = temperatureDays[i].originalCycleDay
+      return shift
+    }
+  }
+
+  return { detected: false }
+}
+
+function checkIfFirstHighMeasurement(temp, i, temperatureDays, ltl) {
+  // need at least 3 high temps to form a high temperature level
+  if (i > temperatureDays.length - 3) {
+    return { detected: false }
+  }
+  const nextDays = temperatureDays.slice(i + 1, i + 4)
+
+  return (
+    getResultForRegularRule(nextDays, ltl)) ||
+    getResultForFirstExceptionRule(nextDays, ltl) ||
+    getResultForSecondExceptionRule(nextDays, ltl) ||
+    { detected: false }
+}
+
+function getResultForRegularRule(nextDays, ltl) {
+  if (!nextDays.every(day => day.temp > ltl)) return false
+  const thirdDay = nextDays[1]
+  if (rounded(thirdDay.temp - ltl, 0.1) < 0.2) return false
+  return {
+    detected: true,
+    rule: 0,
+    ltl,
+    evaluationCompleteDay: thirdDay.originalCycleDay
+  }
+}
+
+function getResultForFirstExceptionRule(nextDays, ltl) {
+  if (nextDays.length < 3) return false
+  if (!nextDays.every(day => day.temp > ltl)) return false
+  const fourthDay = nextDays[2]
+  if (fourthDay.temp <= ltl) return false
+  return {
+    detected: true,
+    rule: 1,
+    ltl,
+    evaluationCompleteDay: fourthDay.originalCycleDay
+  }
+}
+
+function getResultForSecondExceptionRule(nextDays, ltl) {
+  if (nextDays.length < 3) return false
+  if (secondOrThirdTempIsAtOrBelowLtl(nextDays, ltl)) {
+    const fourthDay = nextDays[2]
+    if (rounded(fourthDay.temp - ltl, 0.1) >= 0.2) {
+      return {
+        detected: true,
+        rule: 2,
+        ltl,
+        evaluationCompleteDay: fourthDay.originalCycleDay
+      }
+    }
+  }
+  return false
+}
+
+function secondOrThirdTempIsAtOrBelowLtl(nextDays, ltl) {
+  const secondIsLow = nextDays[0].temp <= ltl
+  const thirdIsLow = nextDays[1].temp <= ltl
+  if ((secondIsLow || thirdIsLow) && !(secondIsLow && thirdIsLow)) {
+    return true
+  } else {
+    return false
+  }
+}
+
+function rounded(val, step) {
+  const inverted = 1 / step
+  // we round the difference because of JS decimal weirdness
+  return Math.round(val * inverted) / inverted
+}
diff --git a/package-lock.json b/package-lock.json
index 763d5ec..995d84f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1149,6 +1149,14 @@
       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
       "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y="
     },
+    "assert": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/assert/-/assert-1.4.1.tgz",
+      "integrity": "sha1-mZEtWRg2tab1s0XA8H7vwI/GXZE=",
+      "requires": {
+        "util": "0.10.3"
+      }
+    },
     "assert-plus": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.2.0.tgz",
@@ -8169,6 +8177,21 @@
         }
       }
     },
+    "util": {
+      "version": "0.10.3",
+      "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz",
+      "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
+      "requires": {
+        "inherits": "2.0.1"
+      },
+      "dependencies": {
+        "inherits": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.1.tgz",
+          "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE="
+        }
+      }
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
diff --git a/package.json b/package.json
index 1849fda..10fa366 100644
--- a/package.json
+++ b/package.json
@@ -12,9 +12,10 @@
     "log": "./node_modules/.bin/react-native log-android | grep -v 'Warning: isMounted(...) is deprecated'",
     "test": "mocha --recursive --require babel-core/register test && npm run lint",
     "test-watch": "mocha --recursive --require babel-core/register --watch test",
-    "lint": "eslint app test"
+    "lint": "eslint components lib test"
   },
   "dependencies": {
+    "assert": "^1.4.1",
     "date-range": "0.0.2",
     "js-joda": "^1.8.2",
     "moment": "^2.22.1",
diff --git a/styles/index.js b/styles/index.js
index 52fc65d..1b09eb4 100644
--- a/styles/index.js
+++ b/styles/index.js
@@ -21,7 +21,6 @@ export default StyleSheet.create({
   },
   cycleDayNumber: {
     fontSize: 18,
-    margin: 15,
     textAlign: 'center',
     textAlignVertical: 'center'
   },
@@ -57,7 +56,8 @@ export default StyleSheet.create({
   cycleDayNumberView: {
     justifyContent: 'center',
     backgroundColor: 'skyblue',
-    marginBottom: 15
+    marginBottom: 15,
+    paddingVertical: 15
   },
   homeButtons: {
     marginHorizontal: 15
diff --git a/test/cycle.spec.js b/test/cycle.spec.js
new file mode 100644
index 0000000..3b82c40
--- /dev/null
+++ b/test/cycle.spec.js
@@ -0,0 +1,336 @@
+import chai from 'chai'
+import dirtyChai from 'dirty-chai'
+import cycleModule from '../lib/cycle'
+
+const expect = chai.expect
+chai.use(dirtyChai)
+
+describe('getCycleDay', () => {
+  it('works for a simple example', () => {
+    const bleedingDays = [{
+      date: '2018-05-10',
+      bleeding: {
+        value: 2
+      }
+    }, {
+      date: '2018-05-09',
+      bleeding: {
+        value: 2
+      }
+    }, {
+      date: '2018-05-03',
+      bleeding: {
+        value: 2
+      }
+    }]
+    const getCycleDayNumber = cycleModule({ bleedingDaysSortedByDate: bleedingDays }).getCycleDayNumber
+    const targetDate = '2018-05-17'
+    const result = getCycleDayNumber(targetDate)
+    expect(result).to.eql(9)
+  })
+
+  it('works if some bleedings are exluded', function () {
+    const bleedingDays = [{
+      date: '2018-05-10',
+      bleeding: {
+        value: 2,
+        exclude: true
+      }
+    }, {
+      date: '2018-05-09',
+      bleeding: {
+        value: 2,
+        exclude: true
+      }
+    }, {
+      date: '2018-05-03',
+      bleeding: {
+        value: 2
+      }
+    }]
+    const targetDate = '2018-05-17'
+    const getCycleDayNumber = cycleModule({ bleedingDaysSortedByDate: bleedingDays }).getCycleDayNumber
+    const result = getCycleDayNumber(targetDate)
+    expect(result).to.eql(15)
+  })
+
+  it('gets the correct number if the target day is not in the current cycle', () => {
+    const bleedingDays = [{
+      date: '2018-05-13',
+      bleeding: {
+        value: 2
+      }
+    }, {
+      date: '2018-04-11',
+      bleeding: {
+        value: 2
+      }
+    }, {
+      date: '2018-04-10',
+      bleeding: {
+        value: 2
+      }
+    }]
+
+    const targetDate = '2018-04-27'
+    const getCycleDayNumber = cycleModule({ bleedingDaysSortedByDate: bleedingDays }).getCycleDayNumber
+    const result = getCycleDayNumber(targetDate)
+    expect(result).to.eql(18)
+  })
+
+  it('gets the correct number if the target day is the only bleeding day', () => {
+    const bleedingDays = [{
+      date: '2018-05-13',
+      bleeding: {
+        value: 2
+      }
+    }]
+
+    const targetDate = '2018-05-13'
+    const getCycleDayNumber = cycleModule({ bleedingDaysSortedByDate: bleedingDays }).getCycleDayNumber
+    const result = getCycleDayNumber(targetDate)
+    expect(result).to.eql(1)
+  })
+
+  describe('getCycleDay returns null', () => {
+    it('if there are no bleeding days', function () {
+      const bleedingDays = []
+      const targetDate = '2018-05-17'
+      const getCycleDayNumber = cycleModule({ bleedingDaysSortedByDate: bleedingDays }).getCycleDayNumber
+      const result = getCycleDayNumber(targetDate)
+      expect(result).to.be.null()
+    })
+  })
+
+  describe('getCycleDay with cycle thresholds', () => {
+    const maxBreakInBleeding = 3
+
+    it('disregards bleeding breaks shorter than max allowed bleeding break in a bleeding period', () => {
+      const bleedingDays = [{
+        date: '2018-05-14',
+        bleeding: {
+          value: 2
+        }
+      }, {
+        date: '2018-05-10',
+        bleeding: {
+          value: 2
+        }
+      }]
+
+      const targetDate = '2018-05-17'
+      const getCycleDayNumber = cycleModule({ bleedingDaysSortedByDate: bleedingDays, maxBreakInBleeding }).getCycleDayNumber
+      const result = getCycleDayNumber(targetDate)
+      expect(result).to.eql(8)
+    })
+
+    it('counts bleeding breaks longer than maxAllowedBleedingBreak in a bleeding period', () => {
+      const bleedingDays = [{
+        date: '2018-05-14',
+        bleeding: {
+          value: 2
+        }
+      }, {
+        date: '2018-05-09',
+        bleeding: {
+          value: 2
+        }
+      }]
+      const targetDate = '2018-05-17'
+      const getCycleDayNumber = cycleModule({ bleedingDaysSortedByDate: bleedingDays, maxBreakInBleeding }).getCycleDayNumber
+      const result = getCycleDayNumber(targetDate)
+      expect(result).to.eql(4)
+    })
+  })
+})
+
+describe('getCyclesBefore', () => {
+  it('gets previous cycles', () => {
+    const cycleDaysSortedByDate = [
+      {
+        date: '2018-07-05',
+        bleeding: { value: 2 }
+      },
+      {
+        date: '2018-06-05',
+        bleeding: { value: 2 }
+      },
+      {
+        date: '2018-05-05',
+        mucus: { value: 2 }
+      },
+      {
+        date: '2018-05-04',
+        bleeding: { value: 2 }
+      },
+      {
+        date: '2018-05-03',
+        bleeding: { value: 2 }
+      },
+      {
+        date: '2018-04-05',
+        mucus: { value: 2 }
+      },
+      {
+        date: '2018-04-04',
+        mucus: { value: 2 }
+      },
+      {
+        date: '2018-04-03',
+        mucus: { value: 2 }
+      },
+      {
+        date: '2018-04-02',
+        bleeding: { value: 2 }
+      },
+    ]
+
+    const { getCyclesBefore } = cycleModule({
+      cycleDaysSortedByDate,
+      bleedingDaysSortedByDate: cycleDaysSortedByDate.filter(d => d.bleeding)
+    })
+    const result = getCyclesBefore(cycleDaysSortedByDate[0])
+    expect(result.length).to.eql(3)
+    expect(result).to.eql([
+      [
+        {
+          date: '2018-06-05',
+          bleeding: { value: 2 }
+        }
+      ], [
+        {
+          date: '2018-05-05',
+          mucus: { value: 2 }
+        },
+        {
+          date: '2018-05-04',
+          bleeding: { value: 2 }
+        },
+        {
+          date: '2018-05-03',
+          bleeding: { value: 2 }
+        }
+      ], [
+        {
+          date: '2018-04-05',
+          mucus: { value: 2 }
+        },
+        {
+          date: '2018-04-04',
+          mucus: { value: 2 }
+        },
+        {
+          date: '2018-04-03',
+          mucus: { value: 2 }
+        },
+        {
+          date: '2018-04-02',
+          bleeding: { value: 2 }
+        },
+      ]
+    ])
+  })
+})
+
+describe('getCycleForDay', () => {
+  const cycleDaysSortedByDate = [
+    {
+      date: '2018-07-05',
+      bleeding: { value: 2 }
+    },
+    {
+      date: '2018-06-05',
+      bleeding: { value: 2 }
+    },
+    {
+      date: '2018-05-05',
+      mucus: { value: 2 }
+    },
+    {
+      date: '2018-05-04',
+      bleeding: { value: 2 }
+    },
+    {
+      date: '2018-05-03',
+      bleeding: { value: 2 }
+    },
+    {
+      date: '2018-04-05',
+      mucus: { value: 2 }
+    },
+    {
+      date: '2018-04-04',
+      mucus: { value: 2 }
+    },
+    {
+      date: '2018-04-03',
+      mucus: { value: 2 }
+    },
+    {
+      date: '2018-04-02',
+      bleeding: { value: 2 }
+    },
+  ]
+  const { getCycleForDay } = cycleModule({
+    cycleDaysSortedByDate,
+    bleedingDaysSortedByDate: cycleDaysSortedByDate.filter(d => d.bleeding)
+  })
+
+  it('gets cycle that has only one day', () => {
+    const result = getCycleForDay('2018-07-05')
+    expect(result.length).to.eql(1)
+    expect(result).to.eql([
+      {
+        date: '2018-07-05',
+        bleeding: { value: 2 }
+      }
+    ])
+    const result2 = getCycleForDay('2018-06-05')
+    expect(result2.length).to.eql(1)
+    expect(result2).to.eql([
+      {
+        date: '2018-06-05',
+        bleeding: { value: 2 }
+      }
+    ])
+  })
+
+  it('for later date gets cycle that has only one day', () => {
+    const result = getCycleForDay('2018-06-20')
+    expect(result.length).to.eql(1)
+    expect(result).to.eql([
+      {
+        date: '2018-06-05',
+        bleeding: { value: 2 }
+      }
+    ])
+  })
+
+  it('returns null if there is no cycle start for that date', () => {
+    const result = getCycleForDay('2018-04-01')
+    expect(result).to.eql(null)
+  })
+
+  it('gets cycle for day', () => {
+    const result = getCycleForDay('2018-04-04')
+    expect(result.length).to.eql(4)
+    expect(result).to.eql([
+      {
+        date: '2018-04-05',
+        mucus: { value: 2 }
+      },
+      {
+        date: '2018-04-04',
+        mucus: { value: 2 }
+      },
+      {
+        date: '2018-04-03',
+        mucus: { value: 2 }
+      },
+      {
+        date: '2018-04-02',
+        bleeding: { value: 2 }
+      },
+    ])
+  })
+})
\ No newline at end of file
diff --git a/test/get-cycle-day.spec.js b/test/get-cycle-day.spec.js
deleted file mode 100644
index 8aaaddd..0000000
--- a/test/get-cycle-day.spec.js
+++ /dev/null
@@ -1,146 +0,0 @@
-import chai from 'chai'
-import dirtyChai from 'dirty-chai'
-
-const expect = chai.expect
-chai.use(dirtyChai)
-
-import getCycleDayNumberModule from '../lib/get-cycle-day-number'
-
-describe('getCycleDay', () => {
-  it('works for a simple example', function () {
-    const bleedingDays = [{
-      date: '2018-05-10',
-      bleeding: {
-        value: 2
-      }
-    }, {
-      date: '2018-05-09',
-      bleeding: {
-        value: 2
-      }
-    }, {
-      date: '2018-05-03',
-      bleeding: {
-        value: 2
-      }
-    }]
-    const getCycleDayNumber = getCycleDayNumberModule({bleedingDaysSortedByDate: bleedingDays})
-    const targetDate = '2018-05-17'
-    const result = getCycleDayNumber(targetDate)
-    expect(result).to.eql(9)
-  })
-
-  it('works if some bleedings are exluded', function () {
-    const bleedingDays = [{
-      date: '2018-05-10',
-      bleeding: {
-        value: 2,
-        exclude: true
-      }
-    }, {
-      date: '2018-05-09',
-      bleeding: {
-        value: 2,
-        exclude: true
-      }
-    }, {
-      date: '2018-05-03',
-      bleeding: {
-        value: 2
-      }
-    }]
-    const targetDate = '2018-05-17'
-    const getCycleDayNumber = getCycleDayNumberModule({bleedingDaysSortedByDate: bleedingDays})
-    const result = getCycleDayNumber(targetDate)
-    expect(result).to.eql(15)
-  })
-
-  it('gets the correct number if the target day is not in the current cycle', () => {
-    const bleedingDays = [{
-      date: '2018-05-13',
-      bleeding: {
-        value: 2
-      }
-    }, {
-      date: '2018-04-11',
-      bleeding: {
-        value: 2
-      }
-    }, {
-      date: '2018-04-10',
-      bleeding: {
-        value: 2
-      }
-    }]
-
-    const targetDate = '2018-04-27'
-    const getCycleDayNumber = getCycleDayNumberModule({bleedingDaysSortedByDate: bleedingDays})
-    const result = getCycleDayNumber(targetDate)
-    expect(result).to.eql(18)
-  })
-
-  it('gets the correct number if the target day is the only bleeding day', () => {
-    const bleedingDays = [{
-      date: '2018-05-13',
-      bleeding: {
-        value: 2
-      }
-    }]
-
-    const targetDate = '2018-05-13'
-    const getCycleDayNumber = getCycleDayNumberModule({bleedingDaysSortedByDate: bleedingDays})
-    const result = getCycleDayNumber(targetDate)
-    expect(result).to.eql(1)
-  })
-})
-
-describe('getCycleDay returns null', () => {
-  it('if there are no bleeding days', function () {
-    const bleedingDays = []
-    const targetDate = '2018-05-17'
-    const getCycleDayNumber = getCycleDayNumberModule({bleedingDaysSortedByDate: bleedingDays})
-    const result = getCycleDayNumber(targetDate)
-    expect(result).to.be.null()
-  })
-})
-
-describe('getCycleDay with cycle thresholds', () => {
-  const maxBreakInBleeding = 3
-
-  it('disregards bleeding breaks shorter than max allowed bleeding break in a bleeding period', () => {
-    const bleedingDays = [{
-      date: '2018-05-14',
-      bleeding: {
-        value: 2
-      }
-    }, {
-      date: '2018-05-10',
-      bleeding: {
-        value: 2
-      }
-    }]
-
-    const targetDate = '2018-05-17'
-    const getCycleDayNumber = getCycleDayNumberModule({bleedingDaysSortedByDate: bleedingDays, maxBreakInBleeding })
-    const result = getCycleDayNumber(targetDate)
-    expect(result).to.eql(8)
-  })
-
-  it('counts bleeding breaks longer than maxAllowedBleedingBreak in a bleeding period', () => {
-    const bleedingDays = [{
-      date: '2018-05-14',
-      bleeding: {
-        value: 2
-      }
-    }, {
-      date: '2018-05-09',
-      bleeding: {
-        value: 2
-      }
-    }]
-    const targetDate = '2018-05-17'
-    const getCycleDayNumber = getCycleDayNumberModule({bleedingDaysSortedByDate: bleedingDays, maxBreakInBleeding })
-    const result = getCycleDayNumber(targetDate)
-    expect(result).to.eql(4)
-  })
-})
\ No newline at end of file
diff --git a/test/sensiplan-mucus.spec.js b/test/sensiplan-mucus.spec.js
index feb4e93..df1c461 100644
--- a/test/sensiplan-mucus.spec.js
+++ b/test/sensiplan-mucus.spec.js
@@ -6,7 +6,7 @@ chai.use(dirtyChai)
 
 import getSensiplanMucus from '../lib/sensiplan-mucus'
 
-describe.only('getSensiplanMucus', () => {
+describe('getSensiplanMucus', () => {
 
   describe('results in t for:', () => {
     it('dry feeling and no texture', function () {
diff --git a/test/sympto/fixtures.js b/test/sympto/fixtures.js
new file mode 100644
index 0000000..6b61492
--- /dev/null
+++ b/test/sympto/fixtures.js
@@ -0,0 +1,301 @@
+
+function convertToSymptoFormat(val) {
+  const sympto = { date: val.date }
+  if (val.temperature) sympto.temperature = { value: val.temperature }
+  if (val.mucus) sympto.mucus = { value: val.mucus }
+  if (val.bleeding) sympto.bleeding = { value: val.bleeding }
+  return sympto
+}
+
+export const cycleWithFhm = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65 },
+  { date: '2018-06-04', temperature: 36.6 },
+  { date: '2018-06-05', temperature: 36.55 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-13', temperature: 36.8, mucus: 4 },
+  { date: '2018-06-15', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-17', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-17', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-18', temperature: 36.9, mucus: 2 }
+].map(convertToSymptoFormat)
+
+export const cycleWithoutFhm = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65 },
+  { date: '2018-06-04', temperature: 36.6 },
+  { date: '2018-06-05', temperature: 36.55 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-09', temperature: 36.8, mucus: 4 },
+  { date: '2018-06-10', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-13', temperature: 36.9, mucus: 2 }
+].map(convertToSymptoFormat)
+
+export const longAndComplicatedCycle = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65 },
+  { date: '2018-06-04', temperature: 36.6 },
+  { date: '2018-06-05', temperature: 36.55 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-09', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-10', temperature: 36.4, mucus: 2 },
+  { date: '2018-06-13', temperature: 36.45, mucus: 3 },
+  { date: '2018-06-14', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-15', temperature: 36.55, mucus: 4 },
+  { date: '2018-06-16', temperature: 36.7, mucus: 3 },
+  { date: '2018-06-17', temperature: 36.65, mucus: 3 },
+  { date: '2018-06-18', temperature: 36.75, mucus: 4 },
+  { date: '2018-06-19', temperature: 36.8, mucus: 1 },
+  { date: '2018-06-20', temperature: 36.85, mucus: 2 },
+  { date: '2018-06-21', temperature: 36.8, mucus: 2 },
+  { date: '2018-06-22', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-25', temperature: 36.9, mucus: 1 },
+  { date: '2018-06-26', temperature: 36.8, mucus: 1 },
+  { date: '2018-06-27', temperature: 36.9, mucus: 1 }
+].map(convertToSymptoFormat)
+
+export const cycleWithTempAndNoMucusShift = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65 },
+  { date: '2018-06-05', temperature: 36.55 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-08', temperature: 36.45, mucus: 1 },
+  { date: '2018-06-09', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-10', temperature: 36.4, mucus: 2 },
+  { date: '2018-06-11', temperature: 36.5, mucus: 3 },
+  { date: '2018-06-13', temperature: 36.45, mucus: 3 },
+  { date: '2018-06-14', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-15', temperature: 36.55, mucus: 4 },
+  { date: '2018-06-16', temperature: 36.7, mucus: 3 },
+  { date: '2018-06-17', temperature: 36.65, mucus: 3 },
+  { date: '2018-06-18', temperature: 36.75, mucus: 4 },
+  { date: '2018-06-19', temperature: 36.8, mucus: 4 },
+  { date: '2018-06-20', temperature: 36.85, mucus: 4 },
+  { date: '2018-06-23', temperature: 36.9, mucus: 3 },
+  { date: '2018-06-24', temperature: 36.85, mucus: 4 },
+  { date: '2018-06-26', temperature: 36.8, mucus: 4 },
+  { date: '2018-06-27', temperature: 36.9, mucus: 4 }
+].map(convertToSymptoFormat)
+
+export const cycleWithEarlyMucus = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65, mucus: 3 },
+  { date: '2018-06-05', temperature: 36.55 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-08', temperature: 36.45, mucus: 1 },
+  { date: '2018-06-09', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-10', temperature: 36.4, mucus: 2 },
+  { date: '2018-06-11', temperature: 36.5, mucus: 3 },
+  { date: '2018-06-13', temperature: 36.45, mucus: 3 },
+  { date: '2018-06-14', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-15', temperature: 36.55, mucus: 4 },
+  { date: '2018-06-16', temperature: 36.7, mucus: 3 },
+  { date: '2018-06-17', temperature: 36.65, mucus: 3 },
+  { date: '2018-06-18', temperature: 36.75, mucus: 4 },
+  { date: '2018-06-19', temperature: 36.8, mucus: 4 },
+  { date: '2018-06-20', temperature: 36.85, mucus: 4 },
+  { date: '2018-06-23', temperature: 36.9, mucus: 3 },
+  { date: '2018-06-24', temperature: 36.85, mucus: 4 },
+  { date: '2018-06-26', temperature: 36.8, mucus: 4 },
+  { date: '2018-06-27', temperature: 36.9, mucus: 4 }
+].map(convertToSymptoFormat)
+
+export const cycleWithMucusOnFirstDay = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2, mucus: 3},
+  { date: '2018-06-02', temperature: 36.65, mucus: 3 },
+  { date: '2018-06-05', temperature: 36.55 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-08', temperature: 36.45, mucus: 1 },
+  { date: '2018-06-09', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-10', temperature: 36.4, mucus: 2 },
+  { date: '2018-06-11', temperature: 36.5, mucus: 3 },
+  { date: '2018-06-13', temperature: 36.45, mucus: 3 },
+  { date: '2018-06-14', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-15', temperature: 36.55, mucus: 4 },
+  { date: '2018-06-16', temperature: 36.7, mucus: 3 },
+  { date: '2018-06-17', temperature: 36.65, mucus: 3 },
+  { date: '2018-06-18', temperature: 36.75, mucus: 4 },
+  { date: '2018-06-19', temperature: 36.8, mucus: 4 },
+  { date: '2018-06-20', temperature: 36.85, mucus: 4 },
+  { date: '2018-06-23', temperature: 36.9, mucus: 3 },
+  { date: '2018-06-24', temperature: 36.85, mucus: 4 },
+  { date: '2018-06-26', temperature: 36.8, mucus: 4 },
+  { date: '2018-06-27', temperature: 36.9, mucus: 4 }
+].map(convertToSymptoFormat)
+
+export const cycleWithoutAnyShifts = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65 },
+  { date: '2018-06-04', temperature: 36.6 },
+  { date: '2018-06-05', temperature: 36.55 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-07', temperature: 36.75, mucus: 0 },
+  { date: '2018-06-08', temperature: 36.45, mucus: 1 }
+].map(convertToSymptoFormat)
+
+export const fiveDayCycle = [
+  { date: '2018-06-01', bleeding: 2 },
+  { date: '2018-06-03', bleeding: 3 },
+].map(convertToSymptoFormat)
+
+export const mucusPeakAndFhmOnSameDay = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65 },
+  { date: '2018-06-04', temperature: 36.6 },
+  { date: '2018-06-05', temperature: 36.55 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-09', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-10', temperature: 36.4, mucus: 2 },
+  { date: '2018-06-13', temperature: 36.45, mucus: 3 },
+  { date: '2018-06-14', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-15', temperature: 36.55, mucus: 4 },
+  { date: '2018-06-16', temperature: 36.7, mucus: 3 },
+  { date: '2018-06-17', temperature: 36.65, mucus: 3 },
+  { date: '2018-06-18', temperature: 36.75, mucus: 4 },
+  { date: '2018-06-19', temperature: 36.8, mucus: 3 },
+  { date: '2018-06-20', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-21', temperature: 36.8, mucus: 2 },
+  { date: '2018-06-22', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-25', temperature: 36.9, mucus: 1 },
+  { date: '2018-06-26', temperature: 36.8, mucus: 1 },
+  { date: '2018-06-27', temperature: 36.9, mucus: 1 }
+].map(convertToSymptoFormat)
+
+export const fhmTwoDaysBeforeMucusPeak = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65 },
+  { date: '2018-06-04', temperature: 36.6 },
+  { date: '2018-06-05', temperature: 36.55 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-09', temperature: 36.5, mucus: 1 },
+  { date: '2018-06-10', temperature: 36.4, mucus: 2 },
+  { date: '2018-06-13', temperature: 36.45, mucus: 2 },
+  { date: '2018-06-14', temperature: 36.5, mucus: 2 },
+  { date: '2018-06-15', temperature: 36.55, mucus: 1 },
+  { date: '2018-06-16', temperature: 36.7, mucus: 2 },
+  { date: '2018-06-17', temperature: 36.65, mucus: 2 },
+  { date: '2018-06-18', temperature: 36.75, mucus: 2 },
+  { date: '2018-06-19', temperature: 36.8, mucus: 3 },
+  { date: '2018-06-20', temperature: 36.85, mucus: 2 },
+  { date: '2018-06-21', temperature: 36.8, mucus: 4 },
+  { date: '2018-06-22', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-25', temperature: 36.9, mucus: 1 },
+  { date: '2018-06-26', temperature: 36.8, mucus: 1 },
+].map(convertToSymptoFormat)
+
+export const mucusPeakTwoDaysBeforeFhm = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65 },
+  { date: '2018-06-04', temperature: 36.6 },
+  { date: '2018-06-05', temperature: 36.55, mucus: 2 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-09', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-10', temperature: 36.4, mucus: 2 },
+  { date: '2018-06-13', temperature: 36.45, mucus: 3 },
+  { date: '2018-06-14', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-15', temperature: 36.55, mucus: 4 },
+  { date: '2018-06-16', temperature: 36.7, mucus: 4 },
+  { date: '2018-06-17', temperature: 36.65, mucus: 3 },
+  { date: '2018-06-18', temperature: 36.75, mucus: 2 },
+  { date: '2018-07-02', temperature: 36.8, mucus: 3 },
+  { date: '2018-07-03', temperature: 36.9, mucus: 2 },
+  { date: '2018-07-04', temperature: 36.8, mucus: 2 },
+].map(convertToSymptoFormat)
+
+export const mucusPeak5DaysAfterFhm = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65, mucus: 2 },
+  { date: '2018-06-04', temperature: 36.6 },
+  { date: '2018-06-05', temperature: 36.55 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-09', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-10', temperature: 36.4, mucus: 2 },
+  { date: '2018-06-13', temperature: 36.45, mucus: 3 },
+  { date: '2018-06-14', temperature: 36.5, mucus: 3 },
+  { date: '2018-06-15', temperature: 36.55, mucus: 3 },
+  { date: '2018-06-16', temperature: 36.7, mucus: 3 },
+  { date: '2018-06-17', temperature: 36.65, mucus: 3 },
+  { date: '2018-06-18', temperature: 36.60, mucus: 2 },
+  { date: '2018-06-19', temperature: 36.8, mucus: 2 },
+  { date: '2018-06-20', temperature: 36.85, mucus: 2 },
+  { date: '2018-06-21', temperature: 36.8, mucus: 2 },
+  { date: '2018-06-22', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-25', temperature: 36.9, mucus: 1 },
+  { date: '2018-06-26', temperature: 36.8, mucus: 4 },
+  { date: '2018-06-30', temperature: 36.9, mucus: 1 },
+  { date: '2018-07-01', temperature: 36.9, mucus: 1 },
+  { date: '2018-07-02', temperature: 36.9, mucus: 1 }
+].map(convertToSymptoFormat)
+
+export const fhm5DaysAfterMucusPeak = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65 },
+  { date: '2018-06-04', temperature: 36.6 },
+  { date: '2018-06-05', temperature: 36.55 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-09', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-10', temperature: 36.4, mucus: 2 },
+  { date: '2018-06-13', temperature: 36.45, mucus: 3 },
+  { date: '2018-06-14', temperature: 36.5, mucus: 4 },
+  { date: '2018-06-15', temperature: 36.55, mucus: 3 },
+  { date: '2018-06-16', temperature: 36.7, mucus: 3 },
+  { date: '2018-06-17', temperature: 36.65, mucus: 3 },
+  { date: '2018-06-18', temperature: 36.75, mucus: 2 },
+  { date: '2018-06-19', temperature: 36.8, mucus: 2 },
+  { date: '2018-06-20', temperature: 36.85, mucus: 2 },
+  { date: '2018-06-21', temperature: 36.8, mucus: 2 },
+  { date: '2018-06-22', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-25', temperature: 36.9, mucus: 1 },
+  { date: '2018-06-26', temperature: 36.8, mucus: 4 },
+  { date: '2018-06-27', temperature: 36.9, mucus: 1 }
+].map(convertToSymptoFormat)
+
+export const fhmOnDay12 = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65 },
+  { date: '2018-06-04', temperature: 36.6 },
+  { date: '2018-06-05', temperature: 36.55 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-09', temperature: 36.5, mucus: 2 },
+  { date: '2018-06-10', temperature: 36.4, mucus: 3 },
+  { date: '2018-06-12', temperature: 36.8, mucus: 3 },
+  { date: '2018-06-14', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-17', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-18', temperature: 36.9, mucus: 2 },
+].map(convertToSymptoFormat)
+
+export const fhmOnDay15 = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65 },
+  { date: '2018-06-04', temperature: 36.6 },
+  { date: '2018-06-05', temperature: 36.55 },
+  { date: '2018-06-06', temperature: 36.7, mucus: 0 },
+  { date: '2018-06-09', temperature: 36.5, mucus: 2 },
+  { date: '2018-06-10', temperature: 36.4, mucus: 3 },
+  { date: '2018-06-15', temperature: 36.8, mucus: 3 },
+  { date: '2018-06-16', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-17', temperature: 36.9, mucus: 2 },
+  { date: '2018-06-18', temperature: 36.9, mucus: 2 },
+].map(convertToSymptoFormat)
+
+export const mucusPeakSlightlyBeforeTempShift = [
+  { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
+  { date: '2018-06-02', temperature: 36.65 },
+  { date: '2018-06-04', temperature: 36.6 },
+  { date: '2018-06-07', temperature: 36.4, mucus: 1 },
+  { date: '2018-06-08', temperature: 36.35, mucus: 2},
+  { date: '2018-06-09', temperature: 36.4, mucus: 2},
+  { date: '2018-06-10', temperature: 36.45, mucus: 2},
+  { date: '2018-06-11', temperature: 36.4, mucus: 3},
+  { date: '2018-06-12', temperature: 36.45, mucus: 3},
+  { date: '2018-06-13', temperature: 36.45, mucus: 4},
+  { date: '2018-06-14', temperature: 36.55, mucus: 3},
+  { date: '2018-06-15', temperature: 36.6, mucus: 3},
+  { date: '2018-06-16', temperature: 36.6, mucus: 3},
+  { date: '2018-06-17', temperature: 36.55, mucus: 2},
+  { date: '2018-06-18', temperature: 36.6, mucus: 1},
+  { date: '2018-06-19', temperature: 36.7, mucus: 1},
+  { date: '2018-06-20', temperature: 36.75, mucus: 1},
+  { date: '2018-06-21', temperature: 36.8, mucus: 1},
+  { date: '2018-06-22', temperature: 36.8, mucus: 1}
+].map(convertToSymptoFormat)
\ No newline at end of file
diff --git a/test/sympto/index.spec.js b/test/sympto/index.spec.js
new file mode 100644
index 0000000..7f65319
--- /dev/null
+++ b/test/sympto/index.spec.js
@@ -0,0 +1,625 @@
+import chai from 'chai'
+import getSensiplanStatus from '../../lib/sympto'
+import { AssertionError } from 'assert'
+import {
+  cycleWithoutFhm,
+  longAndComplicatedCycle,
+  cycleWithTempAndNoMucusShift,
+  cycleWithFhm,
+  cycleWithoutAnyShifts,
+  fiveDayCycle,
+  cycleWithEarlyMucus,
+  cycleWithMucusOnFirstDay,
+  mucusPeakAndFhmOnSameDay,
+  fhmTwoDaysBeforeMucusPeak,
+  fhm5DaysAfterMucusPeak,
+  mucusPeak5DaysAfterFhm,
+  mucusPeakTwoDaysBeforeFhm,
+  fhmOnDay12,
+  fhmOnDay15,
+  mucusPeakSlightlyBeforeTempShift
+} from './fixtures'
+
+const expect = chai.expect
+
+describe('sympto', () => {
+  describe('with no previous higher measurement', () => {
+    it('with no shifts detects only peri-ovulatory', function () {
+      const status = getSensiplanStatus({
+        cycle: cycleWithoutAnyShifts,
+        previousCycle: cycleWithoutFhm
+      })
+
+      expect(status).to.eql({
+
+        phases: {
+          periOvulatory: {
+            start: { date: '2018-06-01' },
+            cycleDays: cycleWithoutAnyShifts
+          }
+        },
+      })
+    })
+
+    it('with shifts detects only peri-ovulatory and post-ovulatory', () => {
+      const status = getSensiplanStatus({
+        cycle: longAndComplicatedCycle,
+        previousCycle: cycleWithoutFhm
+      })
+
+      expect(status.temperatureShift).to.be.an('object')
+      expect(status.mucusShift).to.be.an('object')
+
+      expect(Object.keys(status.phases).length).to.eql(2)
+      expect(status.phases.periOvulatory).to.eql({
+        start: { date: '2018-06-01' },
+        end: { date: '2018-06-21', time: '18:00' },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => date <= '2018-06-21')
+      })
+      expect(status.phases.postOvulatory).to.eql({
+        start: {
+          date: '2018-06-21',
+          time: '18:00'
+        },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => date >= '2018-06-21')
+      })
+    })
+  })
+  describe('with previous higher measurement', () => {
+    describe('with no shifts detects pre-ovulatory phase', function () {
+      it('according to 5-day-rule', function () {
+        const status = getSensiplanStatus({
+          cycle: fiveDayCycle,
+          previousCycle: cycleWithFhm
+        })
+
+        expect(Object.keys(status.phases).length).to.eql(1)
+
+        expect(status.phases.preOvulatory).to.eql({
+          cycleDays: fiveDayCycle,
+          start: { date: '2018-06-01' },
+          end: { date: '2018-06-05' }
+        })
+      })
+
+    })
+    describe('with no shifts detects pre- and peri-ovulatory phase', () => {
+      it('according to 5-day-rule', function () {
+        const status = getSensiplanStatus({
+          cycle: cycleWithTempAndNoMucusShift,
+          previousCycle: cycleWithFhm
+        })
+
+        expect(Object.keys(status.phases).length).to.eql(2)
+
+        expect(status.phases.preOvulatory).to.eql({
+          cycleDays: cycleWithTempAndNoMucusShift
+            .filter(({date}) => date <= '2018-06-05'),
+          start: { date: '2018-06-01' },
+          end: { date: '2018-06-05' }
+        })
+        expect(status.phases.periOvulatory).to.eql({
+          cycleDays: cycleWithTempAndNoMucusShift
+            .filter(({date}) => date > '2018-06-05'),
+          start: { date: '2018-06-06' }
+        })
+      })
+      it('according to 5-day-rule with shortened pre-phase', function () {
+        const status = getSensiplanStatus({
+          cycle: cycleWithEarlyMucus,
+          previousCycle: cycleWithFhm
+        })
+
+        expect(Object.keys(status.phases).length).to.eql(2)
+
+        expect(status.phases.preOvulatory).to.eql({
+          cycleDays: [cycleWithEarlyMucus[0]],
+          start: { date: '2018-06-01' },
+          end: { date: '2018-06-01' }
+        })
+        expect(status.phases.periOvulatory).to.eql({
+          cycleDays: cycleWithEarlyMucus.slice(1),
+          start: { date: '2018-06-02' }
+        })
+      })
+    })
+    describe('with shifts detects pre- and peri-ovulatory phase', function () {
+      it('according to 5-day-rule', function () {
+        const status = getSensiplanStatus({
+          cycle: longAndComplicatedCycle,
+          previousCycle: cycleWithFhm
+        })
+
+        expect(Object.keys(status.phases).length).to.eql(3)
+
+        expect(status.phases.preOvulatory).to.eql({
+          cycleDays: longAndComplicatedCycle
+            .filter(({date}) => date <= '2018-06-05'),
+          start: { date: '2018-06-01' },
+          end: { date: '2018-06-05' }
+        })
+        expect(status.phases.periOvulatory).to.eql({
+          cycleDays: longAndComplicatedCycle
+            .filter(({date}) => date > '2018-06-05' && date <= '2018-06-21'),
+          start: { date: '2018-06-06' },
+          end: { date: '2018-06-21', time: '18:00'}
+        })
+        expect(status.phases.postOvulatory).to.eql({
+          cycleDays: longAndComplicatedCycle
+            .filter(({date}) => date >= '2018-06-21'),
+          start: { date: '2018-06-21', time: '18:00'}
+        })
+      })
+
+    })
+  })
+
+  describe('combining first higher measurment and mucus peak', () => {
+    it('with fhM + mucus peak on same day finds start of postovu phase', () => {
+      const status = getSensiplanStatus({
+        cycle: mucusPeakAndFhmOnSameDay,
+        previousCycle: cycleWithFhm
+      })
+
+      expect(status.temperatureShift).to.be.an('object')
+      expect(status.mucusShift).to.be.an('object')
+
+      expect(Object.keys(status.phases).length).to.eql(3)
+      expect(status.phases.preOvulatory).to.eql({
+        start: { date: '2018-06-01' },
+        end: { date: '2018-06-05' },
+        cycleDays: mucusPeakAndFhmOnSameDay
+          .filter(({date}) => date <= '2018-06-05')
+      })
+      expect(status.phases.periOvulatory).to.eql({
+        start: { date: '2018-06-06' },
+        end: { date: '2018-06-21', time: '18:00' },
+        cycleDays: mucusPeakAndFhmOnSameDay
+          .filter(({date}) => {
+            return date > '2018-06-05' && date <= '2018-06-21'
+          })
+      })
+      expect(status.phases.postOvulatory).to.eql({
+        start: {
+          date: '2018-06-21',
+          time: '18:00'
+        },
+        cycleDays: mucusPeakAndFhmOnSameDay
+          .filter(({date}) => date >= '2018-06-21')
+      })
+    })
+
+    it('with fhM 2 days before mucus peak waits for end of mucus eval', () => {
+      const status = getSensiplanStatus({
+        cycle: fhmTwoDaysBeforeMucusPeak,
+        previousCycle: cycleWithFhm
+      })
+
+      expect(status.temperatureShift).to.be.an('object')
+      expect(status.mucusShift).to.be.an('object')
+
+      expect(Object.keys(status.phases).length).to.eql(3)
+      expect(status.phases.preOvulatory).to.eql({
+        start: { date: '2018-06-01' },
+        end: { date: '2018-06-05' },
+        cycleDays: fhmTwoDaysBeforeMucusPeak
+          .filter(({date}) => date <= '2018-06-05')
+      })
+      expect(status.phases.periOvulatory).to.eql({
+        start: { date: '2018-06-06' },
+        end: { date: '2018-06-26', time: '18:00' },
+        cycleDays: fhmTwoDaysBeforeMucusPeak
+          .filter(({date}) => {
+            return date > '2018-06-05' && date <= '2018-06-26'
+          })
+      })
+      expect(status.phases.postOvulatory).to.eql({
+        start: {
+          date: '2018-06-26',
+          time: '18:00'
+        },
+        cycleDays: fhmTwoDaysBeforeMucusPeak
+          .filter(({date}) => date >= '2018-06-26')
+      })
+    })
+
+    it('another example for mucus peak before temp shift', () => {
+      const status = getSensiplanStatus({
+        cycle: mucusPeakSlightlyBeforeTempShift,
+        previousCycle: cycleWithFhm
+      })
+
+      expect(status.temperatureShift).to.be.an('object')
+      expect(status.mucusShift).to.be.an('object')
+
+      expect(Object.keys(status.phases).length).to.eql(3)
+      expect(status.phases.preOvulatory).to.eql({
+        start: { date: '2018-06-01' },
+        end: { date: '2018-06-05' },
+        cycleDays: mucusPeakSlightlyBeforeTempShift
+          .filter(({date}) => date <= '2018-06-05')
+      })
+      expect(status.phases.periOvulatory).to.eql({
+        start: { date: '2018-06-06' },
+        end: { date: '2018-06-17', time: '18:00' },
+        cycleDays: mucusPeakSlightlyBeforeTempShift
+          .filter(({date}) => {
+            return date > '2018-06-05' && date <= '2018-06-17'
+          })
+      })
+      expect(status.phases.postOvulatory).to.eql({
+        start: {
+          date: '2018-06-17',
+          time: '18:00'
+        },
+        cycleDays: mucusPeakSlightlyBeforeTempShift
+          .filter(({date}) => date >= '2018-06-17')
+      })
+    })
+
+    it('with another mucus peak 5 days after fHM ignores it', () => {
+      const status = getSensiplanStatus({
+        cycle: mucusPeak5DaysAfterFhm,
+        previousCycle: cycleWithFhm
+      })
+
+      expect(status.temperatureShift).to.be.an('object')
+      expect(status.mucusShift).to.be.an('object')
+
+      expect(Object.keys(status.phases).length).to.eql(3)
+      expect(status.phases.preOvulatory).to.eql({
+        start: { date: '2018-06-01' },
+        end: { date: '2018-06-01' },
+        cycleDays: mucusPeak5DaysAfterFhm
+          .filter(({date}) => date <= '2018-06-01')
+      })
+      expect(status.phases.periOvulatory).to.eql({
+        start: { date: '2018-06-02' },
+        end: { date: '2018-06-22', time: '18:00' },
+        cycleDays: mucusPeak5DaysAfterFhm
+          .filter(({date}) => {
+            return date > '2018-06-01' && date <= '2018-06-22'
+          })
+      })
+      expect(status.phases.postOvulatory).to.eql({
+        start: {
+          date: '2018-06-22',
+          time: '18:00'
+        },
+        cycleDays: mucusPeak5DaysAfterFhm
+          .filter(({date}) => date >= '2018-06-22')
+      })
+    })
+
+    it('with mucus peak 2 days before fhM waits for end of temp eval', () => {
+      const status = getSensiplanStatus({
+        cycle:  mucusPeakTwoDaysBeforeFhm,
+        previousCycle: cycleWithFhm
+      })
+
+      expect(status.temperatureShift).to.be.an('object')
+      expect(status.mucusShift).to.be.an('object')
+
+      expect(Object.keys(status.phases).length).to.eql(3)
+      expect(status.phases.preOvulatory).to.eql({
+        start: { date: '2018-06-01' },
+        end: { date: '2018-06-04' },
+        cycleDays: mucusPeakTwoDaysBeforeFhm
+          .filter(({date}) => date <= '2018-06-04')
+      })
+      expect(status.phases.periOvulatory).to.eql({
+        start: { date: '2018-06-05' },
+        end: { date: '2018-07-03', time: '18:00' },
+        cycleDays: mucusPeakTwoDaysBeforeFhm
+          .filter(({date}) => {
+            return date > '2018-06-04' && date <= '2018-07-03'
+          })
+      })
+      expect(status.phases.postOvulatory).to.eql({
+        start: {
+          date: '2018-07-03',
+          time: '18:00'
+        },
+        cycleDays: mucusPeakTwoDaysBeforeFhm
+          .filter(({date}) => date >= '2018-07-03')
+      })
+    })
+
+    it('with mucus peak 5 days before fhM waits for end of temp eval', () => {
+      const status = getSensiplanStatus({
+        cycle:  fhm5DaysAfterMucusPeak,
+        previousCycle: cycleWithFhm
+      })
+
+      expect(status.temperatureShift).to.be.an('object')
+      expect(status.mucusShift).to.be.an('object')
+
+      expect(Object.keys(status.phases).length).to.eql(3)
+      expect(status.phases.preOvulatory).to.eql({
+        start: { date: '2018-06-01' },
+        end: { date: '2018-06-05' },
+        cycleDays: fhm5DaysAfterMucusPeak
+          .filter(({date}) => date <= '2018-06-05')
+      })
+      expect(status.phases.periOvulatory).to.eql({
+        start: { date: '2018-06-06' },
+        end: { date: '2018-06-21', time: '18:00' },
+        cycleDays: fhm5DaysAfterMucusPeak
+          .filter(({date}) => {
+            return date > '2018-06-05' && date <= '2018-06-21'
+          })
+      })
+      expect(status.phases.postOvulatory).to.eql({
+        start: {
+          date: '2018-06-21',
+          time: '18:00'
+        },
+        cycleDays: fhm5DaysAfterMucusPeak
+          .filter(({date}) => date >= '2018-06-21')
+      })
+    })
+  })
+
+  describe('applying the minus-8 rule', () => {
+    it('shortens the pre-ovu phase if there is a previous <13 fhm', () => {
+      const status = getSensiplanStatus({
+        cycle:  longAndComplicatedCycle,
+        previousCycle: fhmOnDay15,
+        earlierCycles: [fhmOnDay12, ...Array(10).fill(fhmOnDay15)]
+      })
+
+      expect(status.temperatureShift).to.be.an('object')
+      expect(status.mucusShift).to.be.an('object')
+
+      expect(Object.keys(status.phases).length).to.eql(3)
+      expect(status.phases.preOvulatory).to.eql({
+        start: { date: '2018-06-01' },
+        end: { date: '2018-06-04' },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => date <= '2018-06-04')
+      })
+      expect(status.phases.periOvulatory).to.eql({
+        start: { date: '2018-06-05' },
+        end: { date: '2018-06-21', time: '18:00' },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => {
+            return date > '2018-06-04' && date <= '2018-06-21'
+          })
+      })
+      expect(status.phases.postOvulatory).to.eql({
+        start: {
+          date: '2018-06-21',
+          time: '18:00'
+        },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => date >= '2018-06-21')
+      })
+    })
+    it('shortens pre-ovu phase with prev <13 fhm even with <12 cycles', () => {
+      const status = getSensiplanStatus({
+        cycle:  longAndComplicatedCycle,
+        previousCycle: fhmOnDay12,
+        earlierCycles: Array(10).fill(fhmOnDay12)
+      })
+
+      expect(status.temperatureShift).to.be.an('object')
+      expect(status.mucusShift).to.be.an('object')
+
+      expect(Object.keys(status.phases).length).to.eql(3)
+      expect(status.phases.preOvulatory).to.eql({
+        start: { date: '2018-06-01' },
+        end: { date: '2018-06-04' },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => date <= '2018-06-04')
+      })
+      expect(status.phases.periOvulatory).to.eql({
+        start: { date: '2018-06-05' },
+        end: { date: '2018-06-21', time: '18:00' },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => {
+            return date > '2018-06-04' && date <= '2018-06-21'
+          })
+      })
+      expect(status.phases.postOvulatory).to.eql({
+        start: {
+          date: '2018-06-21',
+          time: '18:00'
+        },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => date >= '2018-06-21')
+      })
+    })
+    it('shortens the pre-ovu phase if mucus occurs', () => {
+      const status = getSensiplanStatus({
+        cycle: cycleWithEarlyMucus,
+        previousCycle: fhmOnDay12,
+        earlierCycles: Array(10).fill(fhmOnDay12)
+      })
+
+
+      expect(Object.keys(status.phases).length).to.eql(2)
+      expect(status.phases.preOvulatory).to.eql({
+        start: { date: '2018-06-01' },
+        end: { date: '2018-06-01' },
+        cycleDays: cycleWithEarlyMucus
+          .filter(({date}) => date <= '2018-06-01')
+      })
+      expect(status.phases.periOvulatory).to.eql({
+        start: { date: '2018-06-02' },
+        cycleDays: cycleWithEarlyMucus
+          .filter(({date}) => {
+            return date > '2018-06-01'
+          })
+      })
+    })
+
+    it('shortens the pre-ovu phase if mucus occurs even on the first day', () => {
+      const status = getSensiplanStatus({
+        cycle: cycleWithMucusOnFirstDay,
+        previousCycle: fhmOnDay12,
+        earlierCycles: Array(10).fill(fhmOnDay12)
+      })
+
+
+      expect(Object.keys(status.phases).length).to.eql(1)
+
+      expect(status.phases.periOvulatory).to.eql({
+        start: { date: '2018-06-01' },
+        cycleDays: cycleWithMucusOnFirstDay
+      })
+    })
+
+    it('lengthens the pre-ovu phase if >= 12 cycles with fhm > 13', () => {
+      const status = getSensiplanStatus({
+        cycle: longAndComplicatedCycle,
+        previousCycle: fhmOnDay15,
+        earlierCycles: Array(11).fill(fhmOnDay15)
+      })
+
+
+      expect(Object.keys(status.phases).length).to.eql(3)
+      expect(status.phases.preOvulatory).to.eql({
+        start: { date: '2018-06-01' },
+        end: { date: '2018-06-07' },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => date <= '2018-06-07')
+      })
+      expect(status.phases.periOvulatory).to.eql({
+        start: { date: '2018-06-08' },
+        end: { date: '2018-06-21', time: '18:00' },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => {
+            return date > '2018-06-07' && date <= '2018-06-21'
+          })
+      })
+      expect(status.phases.postOvulatory).to.eql({
+        start: {
+          date: '2018-06-21',
+          time: '18:00'
+        },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => date >= '2018-06-21')
+      })
+    })
+
+    it('does not lengthen the pre-ovu phase if < 12 cycles', () => {
+      const status = getSensiplanStatus({
+        cycle: longAndComplicatedCycle,
+        previousCycle: fhmOnDay15,
+        earlierCycles: Array(10).fill(fhmOnDay15)
+      })
+
+
+      expect(Object.keys(status.phases).length).to.eql(3)
+      expect(status.phases.preOvulatory).to.eql({
+        start: { date: '2018-06-01' },
+        end: { date: '2018-06-05' },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => date <= '2018-06-05')
+      })
+      expect(status.phases.periOvulatory).to.eql({
+        start: { date: '2018-06-06' },
+        end: { date: '2018-06-21', time: '18:00' },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => {
+            return date > '2018-06-05' && date <= '2018-06-21'
+          })
+      })
+      expect(status.phases.postOvulatory).to.eql({
+        start: {
+          date: '2018-06-21',
+          time: '18:00'
+        },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => date >= '2018-06-21')
+      })
+    })
+
+    it('does not detect any pre-ovu phase if prev cycle had no fhm', () => {
+      const status = getSensiplanStatus({
+        cycle: longAndComplicatedCycle,
+        previousCycle: cycleWithoutFhm,
+        earlierCycles: [...Array(12).fill(fhmOnDay15)]
+      })
+
+
+      expect(Object.keys(status.phases).length).to.eql(2)
+      expect(status.phases.periOvulatory).to.eql({
+        start: { date: '2018-06-01' },
+        end: { date: '2018-06-21', time: '18:00' },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => {
+            return date >= '2018-06-01' && date <= '2018-06-21'
+          })
+      })
+      expect(status.phases.postOvulatory).to.eql({
+        start: {
+          date: '2018-06-21',
+          time: '18:00'
+        },
+        cycleDays: longAndComplicatedCycle
+          .filter(({date}) => date >= '2018-06-21')
+      })
+    })
+  })
+
+  describe('when args are wrong', () => {
+    it('throws when arg object is not in right format', () => {
+      const wrongObject = { hello: 'world' }
+      expect(() => getSensiplanStatus(wrongObject)).to.throw(AssertionError)
+    })
+    it('throws if cycle array is empty', () => {
+      expect(() => getSensiplanStatus({cycle: []})).to.throw(AssertionError)
+    })
+    it('throws if cycle days are not in right format', () => {
+      expect(() => getSensiplanStatus({
+        cycle: [{
+          hello: 'world',
+          bleeding: { value: 0 }
+        }],
+        earlierCycles: [[{
+          date: '1992-09-09',
+          bleeding: { value: 0 }
+        }]]
+      })).to.throw(AssertionError)
+      expect(() => getSensiplanStatus({
+        cycle: [{
+          date: '2018-04-13',
+          temperature: {value: '35'},
+          bleeding: { value: 0 }
+        }],
+        earlierCycles: [[{
+          date: '1992-09-09',
+          bleeding: { value: 0 }
+        }]]
+      })).to.throw(AssertionError)
+      expect(() => getSensiplanStatus({
+        cycle: [{
+          date: '09-14-2017',
+          bleeding: { value: 0 }
+        }],
+        earlierCycles: [[{
+          date: '1992-09-09',
+          bleeding: { value: 0 }
+        }]]
+      })).to.throw(AssertionError)
+    })
+    it('throws if first cycle day does not have bleeding value', () => {
+      expect(() => getSensiplanStatus({
+        cycle: [{
+          date: '2017-01-01',
+          bleeding: {
+            value: 'medium'
+          }
+        }],
+        earlierCycles: [[
+          {
+            date: '2017-09-23',
+          }
+        ]]
+      })).to.throw(AssertionError)
+    })
+  })
+})
\ No newline at end of file
diff --git a/test/sympto/mucus.spec.js b/test/sympto/mucus.spec.js
new file mode 100644
index 0000000..f8b83d2
--- /dev/null
+++ b/test/sympto/mucus.spec.js
@@ -0,0 +1,53 @@
+import chai from 'chai'
+import getMucusStatus from '../../lib/sympto/mucus'
+
+const expect = chai.expect
+
+function turnIntoCycleDayObject(value, fakeDate) {
+  return {
+    mucus : { value },
+    date: fakeDate
+  }
+}
+
+describe('sympto', () => {
+  describe('detect mucus shift', () => {
+    describe('regular rule', () => {
+      it('detects mucus shift correctly', function () {
+        const values = [0, 0, 0, 1, 1, 2, 2, 2, 3, 3, 3, 2, 2, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0]
+          .map(turnIntoCycleDayObject)
+        const status = getMucusStatus(values, 12)
+        expect(status).to.eql({
+          detected: true,
+          mucusPeak: {
+            date: 10,
+            mucus: { value: 3 }
+          },
+          evaluationCompleteDay: {
+            date: 13,
+            mucus: { value: 0 }
+          }
+        })
+      })
+
+      it('detects no mucus shift when there are less than 3 days of lower quality', function () {
+        const values = [0, 1, 1, 2, 0, 0, 1, 2, 3, 2, 3, 3, 3, 2, 2]
+          .map(turnIntoCycleDayObject)
+        const status = getMucusStatus(values, 30)
+        expect(status).to.eql({ detected: false })
+      })
+
+      it('detects no mucus shift when there are no mucus values', function () {
+        const status = getMucusStatus(Array(10).fill({date: 1, temperature: { value: 35}}))
+        expect(status).to.eql({ detected: false })
+      })
+
+      it('detects no mucus shift when the mucus values are all the same', function () {
+        const values = [2, 2, 2, 2, 2, 2, 2, 2]
+          .map(turnIntoCycleDayObject)
+        const status = getMucusStatus(values, 30)
+        expect(status).to.eql({ detected: false })
+      })
+    })
+  })
+})
\ No newline at end of file
diff --git a/test/sympto/temperature.spec.js b/test/sympto/temperature.spec.js
new file mode 100644
index 0000000..ce7e6c1
--- /dev/null
+++ b/test/sympto/temperature.spec.js
@@ -0,0 +1,252 @@
+import chai from 'chai'
+import getTemperatureStatus from '../../lib/sympto/temperature'
+
+const expect = chai.expect
+
+function turnIntoCycleDayObject(value, fakeDate) {
+  return {
+    temperature : { value },
+    date: fakeDate
+  }
+}
+
+describe('sympto', () => {
+  describe('detect temperature shift', () => {
+    describe('regular rule', () => {
+      it('reports lower temperature status before shift', () => {
+        const lowerTemps = [36.7, 36.57, 36.47, 36.49, 36.57]
+          .map(turnIntoCycleDayObject)
+        const status = getTemperatureStatus(lowerTemps)
+        expect(status).to.eql({ detected: false })
+      })
+
+      it('detects temperature shift correctly', () => {
+        const tempShift =
+        [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55, 36.8, 36.86, 36.8]
+          .map(turnIntoCycleDayObject)
+        const status = getTemperatureStatus(tempShift)
+        expect(status).to.eql({
+          detected: true,
+          ltl: 36.6,
+          firstHighMeasurementDay: {
+            date: 7,
+            temperature: { value: 36.8 }
+          },
+          evaluationCompleteDay: {
+            date: 9,
+            temperature: { value: 36.8 }
+          },
+          rule: 0
+        })
+      })
+
+      it('detects no temperature shift when there are no 6 low temps', () => {
+        const tempShift = [36.47, 36.49, 36.57, 36.62, 36.55, 36.8, 36.86, 36.8]
+          .map(turnIntoCycleDayObject)
+        const status = getTemperatureStatus(tempShift)
+        expect(status).to.eql({ detected: false })
+      })
+
+      it('detects no temperature shift if the shift is not high enough', () => {
+        const tempShift =
+        [36.57, 36.7, 36.47, 36.49, 36.57, 36.62, 36.55, 36.8, 36.86, 36.8]
+          .map(turnIntoCycleDayObject)
+        const status = getTemperatureStatus(tempShift)
+        expect(status).to.eql({ detected: false })
+      })
+
+      it('detects missing temperature shift correctly', () => {
+        const noTempShift =
+        [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55, 36.8, 36.86, 36.77]
+          .map(turnIntoCycleDayObject)
+        const status = getTemperatureStatus(noTempShift)
+        expect(status).to.eql({ detected: false })
+      })
+
+      it('detects shift after an earlier one was invalid', () => {
+        const temps =
+        [36.4, 36.4, 36.4, 36.4, 36.4, 36.4, 36.6, 36.6, 36.4, 36.4,
+          36.7, 36.8, 36.9]
+          .map(turnIntoCycleDayObject)
+
+        const status = getTemperatureStatus(temps)
+        expect(status).to.eql({
+          ltl: 36.6,
+          firstHighMeasurementDay: {
+            date: 10,
+            temperature: { value: 36.7 }
+          },
+          evaluationCompleteDay: {
+            date: 12,
+            temperature: { value: 36.9 }
+          },
+          detected: true,
+          rule: 0
+        })
+      })
+
+      it('detects 2 consecutive invalid shifts', () => {
+        const temps =
+        [36.4, 36.4, 36.4, 36.4, 36.4, 36.4, 36.6, 36.6, 36.4, 36.4,
+          36.6, 36.6, 36.7]
+          .map(turnIntoCycleDayObject)
+
+        const status = getTemperatureStatus(temps)
+        expect(status).to.eql({ detected: false })
+      })
+    })
+
+    describe('1st exception rule', () => {
+      it('detects temperature shift', () => {
+        const firstException =
+        [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55,
+          36.8, 36.86, 36.77, 36.63]
+          .map(turnIntoCycleDayObject)
+        const status = getTemperatureStatus(firstException)
+        expect(status).to.eql({
+          ltl: 36.6,
+          firstHighMeasurementDay: {
+            date: 7,
+            temperature: { value: 36.8 }
+          },
+
+          evaluationCompleteDay: {
+            date: 10,
+            temperature : { value: 36.63 }
+          },
+          detected: true,
+          rule: 1
+        })
+      })
+
+      it('detects missing temperature shift correctly', () => {
+        const firstExceptionNoShift =
+        [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55,
+          36.8, 36.86, 36.77, 36.57]
+          .map(turnIntoCycleDayObject)
+        const status = getTemperatureStatus(firstExceptionNoShift)
+        expect(status).to.eql({ detected: false })
+      })
+
+      it('detects missing temperature shift with not enough high temps', () => {
+        const temps =
+        [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55, 36.8, 36.86, 36.77]
+          .map(turnIntoCycleDayObject)
+        const status = getTemperatureStatus(temps)
+        expect(status).to.eql({ detected: false })
+
+      })
+
+      it('detects shift after an earlier one was invalid', () => {
+        const temps =
+        [36.4, 36.4, 36.4, 36.4, 36.4, 36.4, 36.6, 36.6, 36.4, 36.4,
+          36.7, 36.7, 36.7, 36.7]
+          .map(turnIntoCycleDayObject)
+
+        const status = getTemperatureStatus(temps)
+        expect(status).to.eql({
+          ltl: 36.6,
+          firstHighMeasurementDay: {
+            date: 10,
+            temperature: { value: 36.7 }
+          },
+
+          evaluationCompleteDay: {
+            date: 13,
+            temperature : { value: 36.7 }
+          },
+          detected: true,
+          rule: 1
+        })
+      })
+
+    })
+
+    describe('2nd exception rule', () => {
+      it('detects temperature shift with exception temp eql ltl', () => {
+        const secondException =
+        [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55,
+          36.8, 36.86, 36.6, 36.8]
+          .map(turnIntoCycleDayObject)
+        const status = getTemperatureStatus(secondException)
+        expect(status).to.eql({
+          ltl: 36.6,
+          firstHighMeasurementDay: {
+            date: 7,
+            temperature: { value: 36.8 }
+          },
+
+          evaluationCompleteDay: {
+            date: 10,
+            temperature : { value: 36.8 }
+          },
+          detected: true,
+          rule: 2
+        })
+      })
+
+      it('detects temperature shift with exception temp lower than ltl', () => {
+        const secondException =
+        [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55,
+          36.8, 36.86, 36.4, 36.8]
+          .map(turnIntoCycleDayObject)
+        const status = getTemperatureStatus(secondException)
+        expect(status).to.eql({
+          ltl: 36.6,
+          firstHighMeasurementDay: {
+            date: 7,
+            temperature: { value: 36.8 }
+          },
+
+          evaluationCompleteDay: {
+            date: 10,
+            temperature : { value: 36.8 }
+          },
+          detected: true,
+          rule: 2
+        })
+      })
+
+
+      it('detects missing temperature shift correctly', () => {
+        const temps =
+        [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55,
+          36.8, 36.86, 36.4, 36.77, 36.77]
+          .map(turnIntoCycleDayObject)
+        const status = getTemperatureStatus(temps)
+        expect(status).to.eql({ detected: false })
+      })
+
+      it('detects missing temperature shift when not enough high temps', () => {
+        const temps =
+        [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55, 36.8, 36.86, 36.4]
+          .map(turnIntoCycleDayObject)
+        const status = getTemperatureStatus(temps)
+        expect(status).to.eql({ detected: false })
+      })
+
+      it('detects shift after an earlier one was invalid', () => {
+        const temps =
+        [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55, 36.8, 36.86, 36.4,
+          36.77, 36.9, 36.9, 36.86, 37.04]
+          .map(turnIntoCycleDayObject)
+        const status = getTemperatureStatus(temps)
+        expect(status).to.eql({
+          ltl: 36.85,
+          firstHighMeasurementDay: {
+            date: 11,
+            temperature: { value: 36.9 }
+          },
+
+          evaluationCompleteDay: {
+            date: 14,
+            temperature : { value: 37.04 }
+          },
+          detected: true,
+          rule: 2
+        })
+      })
+
+    })
+  })
+})
\ No newline at end of file