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diff --git a/date-fns/src/getWeekOfMonth/test.js b/date-fns/src/getWeekOfMonth/test.js
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import getWeekOfMonth from '.'
+
+describe('getWeekOfMonth', function () {
+  it('returns the week of the month of the given date', function () {
+    var result = getWeekOfMonth(new Date(2017, 10 /* Nov */, 15))
+    assert(result === 3)
+  })
+
+  describe('edge cases', function () {
+    describe('when the given day is the first of a month', function () {
+      it('returns the week of the month of the given date', function () {
+        var result = getWeekOfMonth(new Date(2017, 10 /* Nov */, 1))
+        assert(result === 1)
+      })
+    })
+
+    describe('when the given day is the last of a month #1', function () {
+      it('returns the week of the month of the given date', function () {
+        var result = getWeekOfMonth(new Date(2017, 10 /* Nov */, 30))
+        assert(result === 5)
+      })
+    })
+
+    describe('when the given day is the last of a month #2', function () {
+      it('returns the week of the month of the given date', function () {
+        var result = getWeekOfMonth(new Date(2017, 9 /* Oct */, 31))
+        assert(result === 5)
+      })
+    })
+  })
+
+  it('allows to specify which day is the first day of the week', function () {
+    var result = getWeekOfMonth(new Date(2017, 9 /* Oct */, 1), {
+      weekStartsOn: 1,
+    })
+    assert(result === 1)
+  })
+
+  it('allows to specify which day is the first day of the week in locale', function () {
+    var result = getWeekOfMonth(new Date(2017, 9 /* Oct */, 31), {
+      // $ExpectedMistake
+      locale: {
+        options: { weekStartsOn: 1 },
+      },
+    })
+    assert(result === 6)
+  })
+
+  it('`options.weekStartsOn` overwrites the first day of the week specified in locale', function () {
+    var result = getWeekOfMonth(new Date(2017, 10 /* Nov */, 13), {
+      weekStartsOn: 1,
+      // $ExpectedMistake
+      locale: {
+        options: { weekStartsOn: 0 },
+      },
+    })
+    assert(result === 3)
+  })
+
+  it('accepts a timestamp', function () {
+    var result = getWeekOfMonth(new Date(2017, 10 /* Nov */, 1).getTime())
+    assert(result === 1)
+  })
+
+  it('returns NaN if the given date is invalid', function () {
+    var result = getWeekOfMonth(new Date(NaN))
+    assert(isNaN(result))
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function () {
+    assert.throws(getWeekOfMonth.bind(null), TypeError)
+  })
+
+  it('returns the week of the month of the given date, when the given date is sunday', function () {
+    var result = getWeekOfMonth(new Date(2019, 4 /* May */, 5), {
+      weekStartsOn: 1,
+    })
+    assert(result === 1)
+  })
+})