Shorten pre-ovu phase when early mucus

lib/sympto/pre-ovulatory.js

@@ -5,13 +5,20 @@ export default function(cycle) {
   const fiveDayEndDate = startDate.plusDays(4).toString()
   const fiveDayRuleDays = cycle.slice(0, 5).filter(d => d.date <= fiveDayEndDate)
   const preOvulatoryDays = getDaysUntilFertileMucus(fiveDayRuleDays)
+  let endDate
+  if (preOvulatoryDays.length === fiveDayRuleDays.length) {
+    endDate = fiveDayEndDate
+  } else {
+    endDate = preOvulatoryDays[preOvulatoryDays.length - 1].date
+  }
+
   return {
     cycleDays: preOvulatoryDays,
     start: {
       date: preOvulatoryDays[0].date
     },
     end: {
-      date: fiveDayEndDate
+      date: endDate
     }
   }
 }

test/sympto/fixtures.js

@@ -63,6 +63,29 @@ const cycleWithTempAndNoMucusShift = [
   { date: '2018-06-27', temperature: 36.9, mucus: 4 }
 ].map(convertToSymptoFormat)
 
+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)
+
 const cycleWithoutAnyShifts = [
   { date: '2018-06-01', temperature: 36.6, bleeding: 2 },
   { date: '2018-06-02', temperature: 36.65 },
@@ -84,5 +107,6 @@ export {
   cycleWithTempAndNoMucusShift,
   cycleWithTempShift,
   cycleWithoutAnyShifts,
-  fiveDayCycle
+  fiveDayCycle,
+  cycleWithEarlyMucus
 }

test/sympto/index.spec.js

@@ -1,7 +1,13 @@
 import chai from 'chai'
 import getSensiplanStatus from '../../lib/sympto'
 import {
-  cycleWithoutTempShift, cycleWithTempAndMucusShift, cycleWithTempAndNoMucusShift, cycleWithTempShift, cycleWithoutAnyShifts, fiveDayCycle
+  cycleWithoutTempShift,
+  cycleWithTempAndMucusShift,
+  cycleWithTempAndNoMucusShift,
+  cycleWithTempShift,
+  cycleWithoutAnyShifts,
+  fiveDayCycle,
+  cycleWithEarlyMucus
 } from './fixtures'
 
 const expect = chai.expect
@@ -86,7 +92,24 @@ describe('sympto', () => {
           start: { date: '2018-06-06' }
         })
       })
+      it('according to 5-day-rule with shortened pre-phase', function () {
+        const status = getSensiplanStatus({
+          cycle: cycleWithEarlyMucus,
+          previousCycle: cycleWithTempShift
+        })
 
+        expect(Object.keys(status.phases).length).to.eql(2)
+        expect(status.assumeFertility).to.be.true()
+        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 () {