Fix bug for just one bleeding day

get-cycle-day-number.js

@@ -16,7 +16,13 @@ export default function config(opts = {}) {
         return day
       })
 
-    const firstBleedingDayBeforeTargetDayIndex = withWrappedDates.findIndex(day => day.wrappedDate.isBefore(targetDate))
+    const firstBleedingDayBeforeTargetDayIndex = withWrappedDates.findIndex(day => {
+      return (
+        day.wrappedDate.isEqual(targetDate) ||
+        day.wrappedDate.isBefore(targetDate)
+      )
+    })
+
     if (firstBleedingDayBeforeTargetDayIndex < 0) return null
     const previousBleedingDays = withWrappedDates.slice(firstBleedingDayBeforeTargetDayIndex)
 

test/get-cycle-day.spec.js

@@ -78,6 +78,20 @@ describe('getCycleDay', () => {
     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', () => {