Chore/retire dirty chai

test/get-cycle-day-number.spec.js

@@ -1,14 +1,7 @@
-import chai from 'chai'
-import dirtyChai from 'dirty-chai'
+import { expect } from 'chai'
 import cycleModule from '../lib/cycle'
 
-const { expect } = chai
-chai.use(dirtyChai)
-
-const simpleCycleStarts = [
-  { date: '2018-05-09' },
-  { date: '2018-05-03'},
-]
+const simpleCycleStarts = [{ date: '2018-05-09' }, { date: '2018-05-03' }]
 
 describe('getCycleDayNumber', () => {
   it('works for a date in the current cycle', () => {
@@ -22,7 +15,7 @@ describe('getCycleDayNumber', () => {
   it('works for a date which is not in the current cycle', () => {
     const cycleStartsSortedByDate = [
       { date: '2018-05-13' },
-      { date: '2018-04-10'}
+      { date: '2018-04-10' },
     ]
     const date = '2018-04-27'
     const { getCycleDayNumber } = cycleModule({ cycleStartsSortedByDate })
@@ -31,9 +24,7 @@ describe('getCycleDayNumber', () => {
   })
 
   it('works for a date which is the first and only day in cycle', () => {
-    const cycleStartsSortedByDate = [
-      { date: '2018-05-13' }
-    ]
+    const cycleStartsSortedByDate = [{ date: '2018-05-13' }]
     const date = '2018-05-13'
     const { getCycleDayNumber } = cycleModule({ cycleStartsSortedByDate })
 
@@ -45,7 +36,7 @@ describe('getCycleDayNumber', () => {
     const date = '2018-05-17'
     const { getCycleDayNumber } = cycleModule({ cycleStartsSortedByDate })
 
-    expect(getCycleDayNumber(date)).to.be.null()
+    expect(getCycleDayNumber(date)).to.be.null
   })
 
   it('returns null if the cycle is longer than the max', function () {
@@ -54,6 +45,6 @@ describe('getCycleDayNumber', () => {
     const date = '2018-08-16'
     const { getCycleDayNumber } = cycleModule({ cycleStartsSortedByDate })
 
-    expect(getCycleDayNumber(date)).to.be.null()
+    expect(getCycleDayNumber(date)).to.be.null
   })
 })