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diff --git a/date-fns/src/eachDayOfInterval/test.ts b/date-fns/src/eachDayOfInterval/test.ts
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+++ b/date-fns/src/eachDayOfInterval/test.ts
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'assert'
+import eachDayOfInterval from '.'
+
+describe('eachDayOfInterval', () => {
+  it('returns an array with starts of days from the day of the start date to the day of the end date', () => {
+    const result = eachDayOfInterval({
+      start: new Date(2014, 9 /* Oct */, 6),
+      end: new Date(2014, 9 /* Oct */, 12)
+    })
+    assert.deepStrictEqual(result, [
+      new Date(2014, 9 /* Oct */, 6),
+      new Date(2014, 9 /* Oct */, 7),
+      new Date(2014, 9 /* Oct */, 8),
+      new Date(2014, 9 /* Oct */, 9),
+      new Date(2014, 9 /* Oct */, 10),
+      new Date(2014, 9 /* Oct */, 11),
+      new Date(2014, 9 /* Oct */, 12)
+    ])
+  })
+
+  it('accepts timestamps', () => {
+    const result = eachDayOfInterval({
+      start: new Date(2014, 9 /* Oct */, 6).getTime(),
+      end: new Date(2014, 9 /* Oct */, 12).getTime()
+    })
+    assert.deepStrictEqual(result, [
+      new Date(2014, 9 /* Oct */, 6),
+      new Date(2014, 9 /* Oct */, 7),
+      new Date(2014, 9 /* Oct */, 8),
+      new Date(2014, 9 /* Oct */, 9),
+      new Date(2014, 9 /* Oct */, 10),
+      new Date(2014, 9 /* Oct */, 11),
+      new Date(2014, 9 /* Oct */, 12)
+    ])
+  })
+
+  it('handles the dates that are not starts of days', () => {
+    const result = eachDayOfInterval({
+      start: new Date(2014, 9 /* Oct */, 6, 6, 35),
+      end: new Date(2014, 9 /* Oct */, 12, 22, 15)
+    })
+    assert.deepStrictEqual(result, [
+      new Date(2014, 9 /* Oct */, 6),
+      new Date(2014, 9 /* Oct */, 7),
+      new Date(2014, 9 /* Oct */, 8),
+      new Date(2014, 9 /* Oct */, 9),
+      new Date(2014, 9 /* Oct */, 10),
+      new Date(2014, 9 /* Oct */, 11),
+      new Date(2014, 9 /* Oct */, 12)
+    ])
+  })
+
+  it('returns one day if the both arguments are on the same day', () => {
+    const result = eachDayOfInterval({
+      start: new Date(2014, 9 /* Oct */, 6, 14),
+      end: new Date(2014, 9 /* Oct */, 6, 15)
+    })
+    assert.deepStrictEqual(result, [new Date(2014, 9 /* Oct */, 6)])
+  })
+
+  it('returns one day if the both arguments are the same', () => {
+    const result = eachDayOfInterval({
+      start: new Date(2014, 9 /* Oct */, 6, 14),
+      end: new Date(2014, 9 /* Oct */, 6, 14)
+    })
+    assert.deepStrictEqual(result, [new Date(2014, 9 /* Oct */, 6)])
+  })
+
+  it('throws an exception if the start date is after the end date', () => {
+    const block = eachDayOfInterval.bind(null, {
+      start: new Date(2014, 9 /* Oct */, 12),
+      end: new Date(2014, 9 /* Oct */, 6)
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws an exception if the start date is `Invalid Date`', () => {
+    var block = eachDayOfInterval.bind(null, {
+      start: new Date(NaN),
+      end: new Date(2014, 9 /* Oct */, 6)
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws an exception if the end date is `Invalid Date`', () => {
+    var block = eachDayOfInterval.bind(null, {
+      start: new Date(2014, 9 /* Oct */, 12),
+      end: new Date(NaN)
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws an exception if the interval is undefined', () => {
+    var block = eachDayOfInterval.bind(
+      null,
+      //@ts-expect-error
+      undefined
+    )
+    assert.throws(block, RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', () => {
+    assert.throws(eachDayOfInterval.bind(null), TypeError)
+  })
+
+  describe('options.step', () => {
+    const interval = {
+      start: new Date(2014, 9 /* Oct */, 6),
+      end: new Date(2014, 9 /* Oct */, 13)
+    }
+
+    const stepError = /^RangeError: `options.step` must be a number greater than 1$/
+
+    it('returns an array with starts of days from the day of the start date to the day of the end date with the given step', () => {
+      const result = eachDayOfInterval(interval, { step: 3 })
+      assert.deepStrictEqual(result, [
+        new Date(2014, 9 /* Oct */, 6),
+        new Date(2014, 9 /* Oct */, 9),
+        new Date(2014, 9 /* Oct */, 12)
+      ])
+    })
+
+    it('throws TypeError error if `options.step` is less than 1', () => {
+      assert.throws(() => eachDayOfInterval(interval, { step: 0 }), stepError)
+      assert.throws(() => eachDayOfInterval(interval, { step: -3 }), stepError)
+    })
+
+    it('throws TypeError error if `options.step` is NaN', () => {
+      //@ts-expect-error
+      assert.throws(() => eachDayOfInterval(interval, { step: 'w' }), stepError)
+      assert.throws(() => eachDayOfInterval(interval, { step: NaN }), stepError)
+    })
+  })
+})