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diff --git a/date-fns/src/eachHourOfInterval/test.ts b/date-fns/src/eachHourOfInterval/test.ts
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+++ b/date-fns/src/eachHourOfInterval/test.ts
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'assert'
+import eachHourOfInterval from '.'
+
+describe('eachHourOfInterval', () => {
+  it('returns an array with starts of hours from the hour of the start date to the hour of the end date', () => {
+    const result = eachHourOfInterval({
+      start: new Date(2014, 9 /* Oct */, 6, 12),
+      end: new Date(2014, 9 /* Oct */, 6, 15)
+    })
+    assert.deepEqual(result, [
+      new Date(2014, 9 /* Oct */, 6, 12),
+      new Date(2014, 9 /* Oct */, 6, 13),
+      new Date(2014, 9 /* Oct */, 6, 14),
+      new Date(2014, 9 /* Oct */, 6, 15)
+    ])
+  })
+
+  it('accepts timestamps', () => {
+    const result = eachHourOfInterval({
+      start: new Date(2014, 9 /* Oct */, 6, 12).getTime(),
+      end: new Date(2014, 9 /* Oct */, 6, 15).getTime()
+    })
+    assert.deepEqual(result, [
+      new Date(2014, 9 /* Oct */, 6, 12),
+      new Date(2014, 9 /* Oct */, 6, 13),
+      new Date(2014, 9 /* Oct */, 6, 14),
+      new Date(2014, 9 /* Oct */, 6, 15)
+    ])
+  })
+
+  it('handles the hours that are not starts of hours', () => {
+    const result = eachHourOfInterval({
+      start: new Date(2014, 9 /* Oct */, 6, 12, 59, 59, 999),
+      end: new Date(2014, 9 /* Oct */, 6, 15, 59, 59, 999)
+    })
+    assert.deepEqual(result, [
+      new Date(2014, 9 /* Oct */, 6, 12),
+      new Date(2014, 9 /* Oct */, 6, 13),
+      new Date(2014, 9 /* Oct */, 6, 14),
+      new Date(2014, 9 /* Oct */, 6, 15)
+    ])
+  })
+
+  it('returns one hour if the both arguments are on the same hour', () => {
+    const result = eachHourOfInterval({
+      start: new Date(2014, 9 /* Oct */, 6, 12, 35),
+      end: new Date(2014, 9 /* Oct */, 6, 12, 47)
+    })
+    assert.deepEqual(result, [new Date(2014, 9 /* Oct */, 6, 12)])
+  })
+
+  it('returns one hour if the both arguments are the same', () => {
+    const result = eachHourOfInterval({
+      start: new Date(2014, 9 /* Oct */, 6, 12, 35),
+      end: new Date(2014, 9 /* Oct */, 6, 12, 35)
+    })
+    assert.deepEqual(result, [new Date(2014, 9 /* Oct */, 6, 12)])
+  })
+
+  it('throws an exception if the start date is after the end date', () => {
+    const block = eachHourOfInterval.bind(null, {
+      start: new Date(2014, 9 /* Oct */, 12, 35, 0, 0, 1),
+      end: new Date(2014, 9 /* Oct */, 12, 35, 0, 0, 0)
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws an exception if the start date is `Invalid Date`', () => {
+    const block = eachHourOfInterval.bind(null, {
+      start: new Date(NaN),
+      end: new Date(2014, 9 /* Oct */, 6, 12)
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws an exception if the end date is `Invalid Date`', () => {
+    const block = eachHourOfInterval.bind(null, {
+      start: new Date(2014, 9 /* Oct */, 12, 12),
+      end: new Date(NaN)
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws an exception if the interval is undefined', () => {
+    const block = eachHourOfInterval.bind(
+      null,
+      // $ExpectedMistake
+      undefined
+    )
+    assert.throws(block, RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', () => {
+    assert.throws(eachHourOfInterval.bind(null), TypeError)
+  })
+
+  describe('options.step', () => {
+    const interval = {
+      start: new Date(2014, 9 /* Oct */, 6, 12),
+      end: new Date(2014, 9 /* Oct */, 6, 18)
+    }
+
+    const stepError = /^RangeError: `options.step` must be a number greater than 1$/
+
+    it('returns an array with starts of hours from the hour of the start date to the hour of the end date with the given step', () => {
+      const result = eachHourOfInterval(interval, { step: 3 })
+      assert.deepEqual(result, [
+        new Date(2014, 9 /* Oct */, 6, 12),
+        new Date(2014, 9 /* Oct */, 6, 15),
+        new Date(2014, 9 /* Oct */, 6, 18)
+      ])
+    })
+
+    it('throws TypeError error if `options.step` is less than 1', () => {
+      assert.throws(() => eachHourOfInterval(interval, { step: 0 }), stepError)
+      assert.throws(() => eachHourOfInterval(interval, { step: -3 }), stepError)
+    })
+
+    it('throws TypeError error if `options.step` is NaN', () => {
+      // $ExpectedMistake
+      assert.throws(
+        () => eachHourOfInterval(interval, { step: 'w' }),
+        stepError
+      )
+      assert.throws(
+        () => eachHourOfInterval(interval, { step: NaN }),
+        stepError
+      )
+    })
+  })
+})