Chore/retire dirty chai

test/get-cycle-by-start-day.spec.js

@@ -1,17 +1,9 @@
-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 cycleStartDay = { date: '2018-05-03' }
 
-const cycle = [
-  { date: '2018-05-05' },
-  { date: '2018-05-04' },
-  cycleStartDay,
-]
+const cycle = [{ date: '2018-05-05' }, { date: '2018-05-04' }, cycleStartDay]
 
 const cycleDaysSortedByDate = [
   { date: '2018-07-05' },
@@ -32,7 +24,6 @@ const cycleStartsSortedByDate = [
 
 describe('getCycleByStartDay', () => {
   it('gets cycle by cycle start day', () => {
-
     const { getCycleByStartDay } = cycleModule({
       cycleDaysSortedByDate,
       cycleStartsSortedByDate,