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diff --git a/date-fns/src/_lib/setUTCISOWeek/test.js b/date-fns/src/_lib/setUTCISOWeek/test.js
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+++ b/date-fns/src/_lib/setUTCISOWeek/test.js
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import setUTCISOWeek from '.'
+
+describe('setUTCISOWeek', function() {
+  it('sets the ISO week', function() {
+    var result = setUTCISOWeek(new Date(Date.UTC(2004, 7 /* Aug */, 7)), 53)
+    assert.deepEqual(result, new Date(Date.UTC(2005, 0 /* Jan */, 1)))
+  })
+
+  it('accepts a timestamp', function() {
+    var result = setUTCISOWeek(
+      new Date(Date.UTC(2009, 11 /* Dec */, 2)).getTime(),
+      1
+    )
+    assert.deepEqual(result, new Date(Date.UTC(2008, 11 /* Dec */, 31)))
+  })
+
+  it('converts a fractional number to an integer', function() {
+    var result = setUTCISOWeek(new Date(Date.UTC(2004, 7 /* Aug */, 7)), 53.53)
+    assert.deepEqual(result, new Date(Date.UTC(2005, 0 /* Jan */, 1)))
+  })
+
+  it('implicitly converts number arguments', function() {
+    var result = setUTCISOWeek(new Date(Date.UTC(2004, 7 /* Aug */, 7)), '53')
+    assert.deepEqual(result, new Date(Date.UTC(2005, 0 /* Jan */, 1)))
+  })
+
+  it('does not mutate the original date', function() {
+    var date = new Date(Date.UTC(2014, 6 /* Jul */, 2))
+    setUTCISOWeek(date, 52)
+    assert.deepEqual(date, new Date(Date.UTC(2014, 6 /* Jul */, 2)))
+  })
+
+  it('handles dates before 100 AD', function() {
+    var initialDate = new Date(0)
+    initialDate.setUTCFullYear(4, 0 /* Jan */, 4)
+    initialDate.setUTCHours(0, 0, 0, 0)
+    var expectedResult = new Date(0)
+    expectedResult.setUTCFullYear(4, 11 /* Dec */, 26)
+    expectedResult.setUTCHours(0, 0, 0, 0)
+    var result = setUTCISOWeek(initialDate, 52)
+    assert.deepEqual(result, expectedResult)
+  })
+
+  it('returns `Invalid Date` if the given date is invalid', function() {
+    var result = setUTCISOWeek(new Date(NaN), 53)
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('returns `Invalid Date` if the given amount is NaN', function() {
+    var result = setUTCISOWeek(new Date(2004, 7 /* Aug */, 7), NaN)
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(setUTCISOWeek.bind(null, 1), TypeError)
+  })
+})