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diff --git a/date-fns/src/setDay/test.js b/date-fns/src/setDay/test.js
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+++ b/date-fns/src/setDay/test.js
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import setDay from '.'
+
+describe('setDay', function () {
+  it('sets the day of the week', function () {
+    var result = setDay(new Date(2014, 8 /* Sep */, 1), 0)
+    assert.deepEqual(result, new Date(2014, 7 /* Aug */, 31))
+  })
+
+  it('allows to specify which day is the first day of the week', function () {
+    var result = setDay(new Date(2014, 8 /* Sep */, 1), 0, { weekStartsOn: 1 })
+    assert.deepEqual(result, new Date(2014, 8 /* Sep */, 7))
+  })
+
+  it('allows to specify which day is the first day of the week in locale', function () {
+    var result = setDay(new Date(2014, 8 /* Sep */, 1), 0, {
+      // $ExpectedMistake
+      locale: {
+        options: { weekStartsOn: 1 },
+      },
+    })
+    assert.deepEqual(result, new Date(2014, 8 /* Sep */, 7))
+  })
+
+  it('`options.weekStartsOn` overwrites the first day of the week specified in locale', function () {
+    var result = setDay(new Date(2014, 8 /* Sep */, 1), 0, {
+      weekStartsOn: 1,
+      // $ExpectedMistake
+      locale: {
+        options: { weekStartsOn: 0 },
+      },
+    })
+    assert.deepEqual(result, new Date(2014, 8 /* Sep */, 7))
+  })
+
+  it('converts a fractional number to an integer', function () {
+    var result = setDay(new Date(2014, 8 /* Sep */, 1), 0.5)
+    assert.deepEqual(result, new Date(2014, 7 /* Aug */, 31))
+  })
+
+  it('implicitly converts options', function () {
+    // $ExpectedMistake
+    var result = setDay(new Date(2014, 8 /* Sep */, 1), 0, {
+      weekStartsOn: '1',
+    })
+    assert.deepEqual(result, new Date(2014, 8 /* Sep */, 7))
+  })
+
+  it('specifies Monday as the first day of the week', function () {
+    var result = setDay(new Date(2014, 8 /* Sep */, 6), 1, {
+      weekStartsOn: 1,
+    })
+    assert.deepEqual(result, new Date(2014, 8 /* Sep */, 1))
+  })
+
+  it('specifies Tuesday as the first day of the week', function () {
+    var result = setDay(new Date(2014, 8 /* Sep */, 6), 1, {
+      weekStartsOn: 2,
+    })
+    assert.deepEqual(result, new Date(2014, 8 /* Sep */, 8))
+  })
+
+  describe('the day index is more than 6', function () {
+    it('sets the day of the next week', function () {
+      var result = setDay(new Date(2014, 8 /* Sep */, 1), 8)
+      assert.deepEqual(result, new Date(2014, 8 /* Sep */, 8))
+    })
+
+    it('allows to specify which day is the first day of the week', function () {
+      var result = setDay(new Date(2014, 8 /* Sep */, 1), 7, {
+        weekStartsOn: 1,
+      })
+      assert.deepEqual(result, new Date(2014, 8 /* Sep */, 8))
+    })
+
+    it('sets the day of another week in the future', function () {
+      var result = setDay(new Date(2014, 8 /* Sep */, 1), 14, {
+        weekStartsOn: 1,
+      })
+      assert.deepEqual(result, new Date(2014, 8 /* Sep */, 15))
+    })
+  })
+
+  describe('the day index is less than 0', function () {
+    it('sets the day of the last week', function () {
+      var result = setDay(new Date(2014, 8 /* Sep */, 1), -6)
+      assert.deepEqual(result, new Date(2014, 7 /* Aug */, 25))
+    })
+
+    it('allows to specify which day is the first day of the week', function () {
+      var result = setDay(new Date(2014, 8 /* Sep */, 1), -7, {
+        weekStartsOn: 1,
+      })
+      assert.deepEqual(result, new Date(2014, 7 /* Aug */, 25))
+    })
+
+    it('set the day of another week in the past', function () {
+      var result = setDay(new Date(2014, 8 /* Sep */, 1), -14, {
+        weekStartsOn: 1,
+      })
+      assert.deepEqual(result, new Date(2014, 7 /* Aug */, 18))
+    })
+  })
+
+  it('accepts a timestamp', function () {
+    var result = setDay(new Date(2014, 8 /* Sep */, 1).getTime(), 3)
+    assert.deepEqual(result, new Date(2014, 8 /* Sep */, 3))
+  })
+
+  it('implicitly converts number arguments', function () {
+    // $ExpectedMistake
+    var result = setDay(new Date(2014, 8 /* Sep */, 1), '5')
+    assert.deepEqual(result, new Date(2014, 8 /* Sep */, 5))
+  })
+
+  it('does not mutate the original date', function () {
+    var date = new Date(2014, 8 /* Sep */, 1)
+    setDay(date, 3)
+    assert.deepEqual(date, new Date(2014, 8 /* Sep */, 1))
+  })
+
+  it('returns `Invalid Date` if the given date is invalid', function () {
+    var result = setDay(new Date(NaN), 0)
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('returns `Invalid Date` if the given amount is NaN', function () {
+    var result = setDay(new Date(2014, 8 /* Sep */, 1), NaN)
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('throws `RangeError` if `options.weekStartsOn` is not convertable to 0, 1, ..., 6 or undefined', function () {
+    // $ExpectedMistake
+    var block = setDay.bind(null, new Date(2014, 8 /* Sep */, 1), 0, {
+      weekStartsOn: NaN,
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 2 arguments', function () {
+    assert.throws(setDay.bind(null), TypeError)
+    assert.throws(setDay.bind(null, 1), TypeError)
+  })
+})