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diff --git a/date-fns/src/setWeekYear/test.js b/date-fns/src/setWeekYear/test.js
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+++ b/date-fns/src/setWeekYear/test.js
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import setWeekYear from '.'
+
+describe('setWeekYear', function() {
+  it('sets the local week-numbering year, saving the week and the day of the week', function() {
+    var result = setWeekYear(new Date(2010, 0 /* Jan */, 2), 2004)
+    assert.deepEqual(result, new Date(2004, 0 /* Jan */, 3))
+  })
+
+  it('accepts a timestamp', function() {
+    var result = setWeekYear(new Date(2008, 11 /* Dec */, 29).getTime(), 2007)
+    assert.deepEqual(result, new Date(2007, 0 /* Jan */, 1))
+  })
+
+  it('converts a fractional number to an integer', function() {
+    var result = setWeekYear(new Date(2010, 0 /* Jan */, 2), 2004.2004)
+    assert.deepEqual(result, new Date(2004, 0 /* Jan */, 3))
+  })
+
+  it('implicitly converts number arguments', function() {
+    // $ExpectedMistake
+    var result = setWeekYear(new Date(2008, 11 /* Dec */, 29), '2007')
+    assert.deepEqual(result, new Date(2007, 0 /* Jan */, 1))
+  })
+
+  it('does not mutate the original date', function() {
+    var date = new Date(2008, 11 /* Dec */, 29)
+    setWeekYear(date, 2000)
+    assert.deepEqual(date, new Date(2008, 11 /* Dec */, 29))
+  })
+
+  it('sets local week-numbering years less than 100', function() {
+    var initialDate = new Date(2008, 11 /* Dec */, 29)
+    var expectedResult = new Date(0)
+    expectedResult.setFullYear(7, 0 /* Jan */, 1)
+    expectedResult.setHours(0, 0, 0, 0)
+    var result = setWeekYear(initialDate, 7)
+    assert.deepEqual(result, expectedResult)
+  })
+
+  it('handles dates before 100 AD', function() {
+    var initialDate = new Date(0)
+    initialDate.setFullYear(8, 11 /* Dec */, 29)
+    initialDate.setHours(0, 0, 0, 0)
+    var expectedResult = new Date(0)
+    expectedResult.setFullYear(7, 0 /* Jan */, 1)
+    expectedResult.setHours(0, 0, 0, 0)
+    var result = setWeekYear(initialDate, 7)
+    assert.deepEqual(result, expectedResult)
+  })
+
+  it('returns `Invalid Date` if the given date is invalid', function() {
+    var result = setWeekYear(new Date(NaN), 2007)
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('returns `Invalid Date` if the given amount is NaN', function() {
+    var result = setWeekYear(new Date(2008, 11 /* Dec */, 29), NaN)
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('allows to specify `weekStartsOn` and `firstWeekContainsDate` in locale', function() {
+    var date = new Date(2010, 0 /* Jan */, 2)
+    var result = setWeekYear(date, 2004, {
+      // $ExpectedMistake
+      locale: {
+        options: { weekStartsOn: 1, firstWeekContainsDate: 4 }
+      }
+    })
+    assert.deepEqual(result, new Date(2005, 0 /* Jan */, 1))
+  })
+
+  it('`options.weekStartsOn` overwrites the first day of the week specified in locale', function() {
+    var date = new Date(2010, 0 /* Jan */, 2)
+    var result = setWeekYear(date, 2004, {
+      weekStartsOn: 1,
+      firstWeekContainsDate: 4,
+      // $ExpectedMistake
+      locale: {
+        options: { weekStartsOn: 0, firstWeekContainsDate: 1 }
+      }
+    })
+    assert.deepEqual(result, new Date(2005, 0 /* Jan */, 1))
+  })
+
+  it('throws `RangeError` if `options.weekStartsOn` is not convertable to 0, 1, ..., 6 or undefined', function() {
+    // $ExpectedMistake
+    var block = setWeekYear.bind(null, new Date(2004, 7 /* Aug */, 7), 2018, {
+      weekStartsOn: NaN
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws `RangeError` if `options.firstWeekContainsDate` is not convertable to 1, 2, ..., 7 or undefined', function() {
+    // $ExpectedMistake
+    var block = setWeekYear.bind(null, new Date(2004, 7 /* Aug */, 7), 2018, {
+      firstWeekContainsDate: NaN
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 2 arguments', function() {
+    assert.throws(setWeekYear.bind(null), TypeError)
+    assert.throws(setWeekYear.bind(null, 1), TypeError)
+  })
+})