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diff --git a/date-fns/src/formatDistanceToNow/test.js b/date-fns/src/formatDistanceToNow/test.js
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+++ b/date-fns/src/formatDistanceToNow/test.js
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'assert'
+import sinon from 'sinon'
+import formatDistanceToNow from '.'
+
+describe('formatDistanceToNow', () => {
+  let clock
+  beforeEach(() => {
+    clock = sinon.useFakeTimers(new Date(1986, 3, 4, 10, 32, 0).getTime())
+  })
+
+  afterEach(() => {
+    clock.restore()
+  })
+
+  describe('seconds', () => {
+    describe('when the includeSeconds option is true', () => {
+      it('less than 5 seconds', () => {
+        const result = formatDistanceToNow(new Date(1986, 3, 4, 10, 31, 58), {
+          includeSeconds: true,
+        })
+        assert(result === 'less than 5 seconds')
+      })
+
+      it('less than 10 seconds', () => {
+        const result = formatDistanceToNow(new Date(1986, 3, 4, 10, 31, 52), {
+          includeSeconds: true,
+        })
+        assert(result === 'less than 10 seconds')
+      })
+
+      it('less than 20 seconds', () => {
+        const result = formatDistanceToNow(new Date(1986, 3, 4, 10, 31, 45), {
+          includeSeconds: true,
+        })
+        assert(result === 'less than 20 seconds')
+      })
+
+      it('half a minute', () => {
+        const result = formatDistanceToNow(new Date(1986, 3, 4, 10, 31, 35), {
+          includeSeconds: true,
+        })
+        assert(result === 'half a minute')
+      })
+
+      it('less than a minute', () => {
+        const result = formatDistanceToNow(new Date(1986, 3, 4, 10, 31, 15), {
+          includeSeconds: true,
+        })
+        assert(result === 'less than a minute')
+      })
+
+      it('1 minute', () => {
+        const result = formatDistanceToNow(new Date(1986, 3, 4, 10, 31, 0), {
+          includeSeconds: true,
+        })
+        assert(result === '1 minute')
+      })
+    })
+  })
+
+  describe('minutes', () => {
+    it('less than a minute', () => {
+      const result = formatDistanceToNow(new Date(1986, 3, 4, 10, 31, 40))
+      assert(result === 'less than a minute')
+    })
+
+    it('1 minute', () => {
+      const result = formatDistanceToNow(new Date(1986, 3, 4, 10, 31, 10))
+      assert(result === '1 minute')
+    })
+
+    it('n minutes', () => {
+      const result = formatDistanceToNow(new Date(1986, 3, 4, 10, 29, 10))
+      assert(result === '3 minutes')
+    })
+  })
+
+  describe('hours', () => {
+    it('about 1 hour', () => {
+      const result = formatDistanceToNow(new Date(1986, 3, 4, 9, 32, 0))
+      assert(result === 'about 1 hour')
+    })
+
+    it('about n hours', () => {
+      const result = formatDistanceToNow(new Date(1986, 3, 4, 7, 32, 0))
+      assert(result === 'about 3 hours')
+    })
+  })
+
+  describe('days', () => {
+    it('1 day', () => {
+      const result = formatDistanceToNow(new Date(1986, 3, 3, 10, 32, 0))
+      assert(result === '1 day')
+    })
+
+    it('n days', () => {
+      const result = formatDistanceToNow(new Date(1986, 3, 1, 10, 32, 0))
+      assert(result === '3 days')
+    })
+  })
+
+  describe('months', () => {
+    it('about 1 month', () => {
+      const result = formatDistanceToNow(new Date(1986, 2, 4, 10, 32, 0))
+      assert(result === 'about 1 month')
+    })
+
+    it('n months', () => {
+      const result = formatDistanceToNow(new Date(1986, 0, 4, 10, 32, 0))
+      assert(result === '3 months')
+    })
+  })
+
+  describe('years', () => {
+    it('about 1 year', () => {
+      const result = formatDistanceToNow(new Date(1985, 3, 4, 10, 32, 0))
+      assert(result === 'about 1 year')
+    })
+
+    it('over 1 year', () => {
+      const result = formatDistanceToNow(new Date(1984, 10, 4, 10, 32, 0))
+      assert(result === 'over 1 year')
+    })
+
+    it('almost n years', () => {
+      const result = formatDistanceToNow(new Date(1983, 4, 4, 10, 32, 0))
+      assert(result === 'almost 3 years')
+    })
+
+    it('about n years', () => {
+      const result = formatDistanceToNow(new Date(1983, 3, 4, 10, 32, 0))
+      assert(result === 'about 3 years')
+    })
+
+    it('over n years', () => {
+      const result = formatDistanceToNow(new Date(1982, 10, 4, 10, 32, 0))
+      assert(result === 'over 3 years')
+    })
+  })
+
+  it('accepts a timestamp', () => {
+    const result = formatDistanceToNow(
+      new Date(1986, 3, 4, 10, 31, 40).getTime()
+    )
+    assert(result === 'less than a minute')
+  })
+
+  describe('when the addSuffix option is true', () => {
+    it('adds a past suffix', () => {
+      const result = formatDistanceToNow(new Date(1986, 3, 4, 10, 31, 35), {
+        includeSeconds: true,
+        addSuffix: true,
+      })
+      assert(result === 'half a minute ago')
+    })
+
+    it('adds a future suffix', () => {
+      const result = formatDistanceToNow(new Date(1986, 3, 4, 11, 32, 0), {
+        addSuffix: true,
+      })
+      assert(result === 'in about 1 hour')
+    })
+  })
+
+  describe('implicit conversion of options', () => {
+    it('`options.includeSeconds`', () => {
+      const result = formatDistanceToNow(
+        new Date(1986, 3, 4, 10, 31, 52),
+        // $ExpectedMistake
+        { includeSeconds: 1 }
+      )
+      assert(result === 'less than 10 seconds')
+    })
+
+    it('`options.addSuffix`', () => {
+      const result = formatDistanceToNow(
+        new Date(1986, 3, 4, 11, 32, 0),
+        // $ExpectedMistake
+        { addSuffix: 1 }
+      )
+      assert(result === 'in about 1 hour')
+    })
+  })
+
+  describe('custom locale', () => {
+    it('can be passed to the function', () => {
+      function localizeDistance(token, count, options) {
+        assert(token === 'aboutXHours')
+        assert(count === 1)
+        assert(options.addSuffix === true)
+        assert(options.comparison > 0)
+        return 'It works!'
+      }
+
+      const customLocale = {
+        formatDistance: localizeDistance,
+      }
+
+      const result = formatDistanceToNow(new Date(1986, 3, 4, 11, 32, 0), {
+        addSuffix: true,
+        // $ExpectedMistake
+        locale: customLocale,
+      })
+
+      assert(result === 'It works!')
+    })
+
+    describe('does not contain `distanceInWords` property', () => {
+      it('throws `RangeError`', function () {
+        const customLocale = {}
+        const block = formatDistanceToNow.bind(
+          null,
+          // $ExpectedMistake
+          new Date(1986, 3, 4, 10, 32, 0),
+          { includeSeconds: true, locale: customLocale }
+        )
+        assert.throws(block, RangeError)
+      })
+    })
+  })
+
+  it('throws RangeError if the passed date is `Invalid Date`', function () {
+    assert.throws(formatDistanceToNow.bind(null, new Date(NaN)), RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', () => {
+    assert.throws(formatDistanceToNow.bind(null), TypeError)
+  })
+})