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diff --git a/date-fns/src/setMinutes/test.js b/date-fns/src/setMinutes/test.js
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+++ b/date-fns/src/setMinutes/test.js
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import setMinutes from '.'
+
+describe('setMinutes', function() {
+  it('sets the minutes', function() {
+    var result = setMinutes(new Date(2014, 8 /* Sep */, 1, 11, 30, 40), 45)
+    assert.deepEqual(result, new Date(2014, 8 /* Sep */, 1, 11, 45, 40))
+  })
+
+  it('accepts a timestamp', function() {
+    var result = setMinutes(new Date(2014, 8 /* Sep */, 1, 11, 30).getTime(), 5)
+    assert.deepEqual(result, new Date(2014, 8 /* Sep */, 1, 11, 5))
+  })
+
+  it('converts a fractional number to an integer', function() {
+    var result = setMinutes(new Date(2014, 8 /* Sep */, 1, 11, 30, 40), 45.54)
+    assert.deepEqual(result, new Date(2014, 8 /* Sep */, 1, 11, 45, 40))
+  })
+
+  it('implicitly converts number arguments', function() {
+    // $ExpectedMistake
+    var result = setMinutes(new Date(2014, 8 /* Sep */, 1, 11, 30, 40), '45')
+    assert.deepEqual(result, new Date(2014, 8 /* Sep */, 1, 11, 45, 40))
+  })
+
+  it('does not mutate the original date', function() {
+    var date = new Date(2014, 8 /* Sep */, 1, 11, 30)
+    setMinutes(date, 15)
+    assert.deepEqual(date, new Date(2014, 8 /* Sep */, 1, 11, 30))
+  })
+
+  it('returns `Invalid Date` if the given date is invalid', function() {
+    var result = setMinutes(new Date(NaN), 45)
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('returns `Invalid Date` if the given amount is NaN', function() {
+    var result = setMinutes(new Date(2014, 8 /* Sep */, 1, 11, 30, 40), NaN)
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('throws TypeError exception if passed less than 2 arguments', function() {
+    assert.throws(setMinutes.bind(null), TypeError)
+    assert.throws(setMinutes.bind(null, 1), TypeError)
+  })
+})