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diff --git a/date-fns/src/closestTo/test.js b/date-fns/src/closestTo/test.js
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import closestTo from '.'
+
+describe('closestTo', function() {
+  it('returns the date from the given array closest to the given date', function() {
+    var date = new Date(2014, 6 /* Jul */, 2)
+    var result = closestTo(date, [
+      new Date(2015, 7 /* Aug */, 31),
+      new Date(2012, 6 /* Jul */, 2)
+    ])
+    assert.deepEqual(result, new Date(2015, 7 /* Aug */, 31))
+  })
+
+  it('works if the closest date from the given array is before the given date', function() {
+    var date = new Date(2014, 6 /* Jul */, 2, 6, 30, 4, 500)
+    var result = closestTo(date, [
+      new Date(2014, 6 /* Jul */, 2, 6, 30, 5, 900),
+      new Date(2014, 6 /* Jul */, 2, 6, 30, 3, 900),
+      new Date(2014, 6 /* Jul */, 2, 6, 30, 10)
+    ])
+    assert.deepEqual(result, new Date(2014, 6 /* Jul */, 2, 6, 30, 3, 900))
+  })
+
+  it('accepts timestamps', function() {
+    var date = new Date(2014, 6 /* Jul */, 2).getTime()
+    var result = closestTo(date, [
+      new Date(2015, 7 /* Aug */, 31).getTime(),
+      new Date(2012, 6 /* Jul */, 2).getTime()
+    ])
+    assert.deepEqual(result, new Date(2015, 7 /* Aug */, 31))
+  })
+
+  it('returns undefined if the given array is empty', function() {
+    var date = new Date(2014, 6 /* Jul */, 2).getTime()
+    var result = closestTo(date, [])
+    assert(result == null)
+  })
+
+  it('returns `Invalid Date` if the given date is `Invalid Date`', function() {
+    var date = new Date(NaN)
+    var result = closestTo(date, [
+      new Date(2015, 7 /* Aug */, 31),
+      new Date(2012, 6 /* Jul */, 2)
+    ])
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('returns `Invalid Date` if any date in the given array is `Invalid Date`', function() {
+    var date = new Date(2014, 6 /* Jul */, 2)
+    var result = closestTo(date, [
+      new Date(2015, 7 /* Aug */, 31),
+      new Date(NaN),
+      new Date(2012, 6 /* Jul */, 2)
+    ])
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('returns `Invalid Date` if any date in the given array is `Invalid Date`', function() {
+    var date = new Date(2014, 6 /* Jul */, 2)
+    var result = closestTo(date, [
+      new Date(2015, 7 /* Aug */, 31),
+      new Date(NaN),
+      new Date(2012, 6 /* Jul */, 2)
+    ])
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('returns `Invalid Date` if any value in the given array is undefined', function() {
+    var date = new Date(2014, 6 /* Jul */, 2)
+    var result = closestTo(date, [
+      new Date(2015, 7 /* Aug */, 31),
+      // $ExpectedMistake
+      undefined,
+      new Date(2012, 6 /* Jul */, 2)
+    ])
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('converts Array-like objects into Array', function() {
+    var date = new Date(2014, 6 /* Jul */, 2)
+    var object = {
+      '0': new Date(2015, 7 /* Aug */, 31),
+      '1': new Date(2012, 6 /* Jul */, 2),
+      length: 2
+    }
+    // $ExpectedMistake
+    var result = closestTo(date, object)
+    assert.deepEqual(result, new Date(2015, 7 /* Aug */, 31))
+  })
+
+  it('converts undefined into empty array', function() {
+    var date = new Date(2014, 6 /* Jul */, 2).getTime()
+    // $ExpectedMistake
+    var result = closestTo(date, undefined)
+    assert(result == null)
+  })
+
+  it('converts null into empty array', function() {
+    var date = new Date(2014, 6 /* Jul */, 2).getTime()
+    // $ExpectedMistake
+    var result = closestTo(date, null)
+    assert(result == null)
+  })
+
+  it('throws TypeError exception if passed less than 2 arguments', function() {
+    assert.throws(closestTo.bind(null), TypeError)
+    assert.throws(closestTo.bind(null, 1), TypeError)
+  })
+})