Moves out the test for getCyclesBefore method of cycle module

test/get-cycles-before.spec.js

@@ -0,0 +1,61 @@
+import chai from 'chai'
+import dirtyChai from 'dirty-chai'
+import cycleModule from '../lib/cycle'
+
+const { expect } = chai
+chai.use(dirtyChai)
+
+const julyCycle = [{ date: '2018-07-05' }]
+const juneCycle = [{ date: '2018-06-05' }]
+const mayCycle = [
+  { date: '2018-05-05' },
+  { date: '2018-05-04' },
+  { date: '2018-05-03' },
+]
+const aprilCycle = [
+  { date: '2018-04-05' },
+  { date: '2018-04-04' },
+  { date: '2018-04-03' },
+  { date: '2018-04-02' },
+]
+
+const cycleDaysSortedByDate = [
+  ...julyCycle,
+  ...juneCycle,
+  ...mayCycle,
+  ...aprilCycle,
+]
+
+const cycleStartsSortedByDate = [
+  { date: '2018-07-05' },
+  { date: '2018-06-05' },
+  { date: '2018-05-03' },
+  { date: '2018-04-02' },
+]
+
+describe('getCyclesBefore', () => {
+  it('gets previous cycles', () => {
+
+    const { getCyclesBefore } = cycleModule({
+      cycleDaysSortedByDate,
+      cycleStartsSortedByDate,
+    })
+    const cyclesBeforeJuly = getCyclesBefore(...julyCycle)
+
+    expect(cyclesBeforeJuly.length).to.eql(3)
+    expect(cyclesBeforeJuly).to.eql([ juneCycle, mayCycle, aprilCycle ])
+  })
+
+  it('skips cycles that are longer than max', () => {
+
+    const { getCyclesBefore } = cycleModule({
+      cycleDaysSortedByDate,
+      cycleStartsSortedByDate,
+      maxCycleLength: 30
+    })
+    const cyclesBeforeJuly = getCyclesBefore(...julyCycle)
+
+    expect(cyclesBeforeJuly.length).to.eql(1)
+    expect(cyclesBeforeJuly).to.eql([ juneCycle ])
+  })
+})