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diff --git a/date-fns/src/roundToNearestMinutes/test.js b/date-fns/src/roundToNearestMinutes/test.js
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+++ b/date-fns/src/roundToNearestMinutes/test.js
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import roundToNearestMinutes from '.'
+
+describe('roundToNearestMinutes', function() {
+  it('rounds given date to the nearest minute by default', function() {
+    var result = roundToNearestMinutes(
+      new Date(2014, 6 /* Jul */, 10, 12, 16, 16)
+    )
+    assert.deepEqual(result, new Date(2014, 6 /* Jul */, 10, 12, 16, 0))
+  })
+
+  it('accepts a timestamp', function() {
+    var result = roundToNearestMinutes(
+      new Date(2014, 6 /* Jul */, 10, 12, 13, 16).getTime()
+    )
+    assert.deepEqual(result, new Date(2014, 6 /* Jul */, 10, 12, 13, 0))
+  })
+
+  it('rounds to the closest x minutes if nearestTo is provided', function() {
+    var result = roundToNearestMinutes(
+      new Date(2014, 6 /* Jul */, 10, 12, 10, 30),
+      { nearestTo: 4 }
+    )
+    assert.deepEqual(result, new Date(2014, 6 /* Jul */, 10, 12, 12, 0))
+  })
+
+  it('rounds up >=30 seconds for nearestTo=1', function() {
+    var result = roundToNearestMinutes(
+      new Date(2014, 6 /* Jul */, 10, 12, 13, 30)
+    )
+    assert.deepEqual(result, new Date(2014, 6 /* Jul */, 10, 12, 14, 0))
+  })
+
+  it('rounds down <30 seconds for nearestTo=1', function() {
+    var result = roundToNearestMinutes(
+      new Date(2014, 6 /* Jul */, 10, 12, 13, 29, 999)
+    )
+    assert.deepEqual(result, new Date(2014, 6 /* Jul */, 10, 12, 13, 0))
+  })
+
+  it('does not mutate the original date', function() {
+    var date = new Date(2014, 6 /* Jul */, 10, 12, 10, 10, 99)
+    roundToNearestMinutes(date)
+    assert.deepEqual(date, new Date(2014, 6 /* Jul */, 10, 12, 10, 10, 99))
+  })
+
+  it('returns `Invalid Date` if the given date is invalid', function() {
+    var result = roundToNearestMinutes(new Date(NaN))
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('throws `TypeError` exception if passed less than 1 argument', function() {
+    assert.throws(roundToNearestMinutes.bind(null), TypeError)
+  })
+
+  it('throws `RangeError` if nearestTo is not between 1 and 30', function() {
+    var date = new Date(2014, 6 /* Jul */, 10, 12, 10, 30)
+    assert.throws(
+      roundToNearestMinutes.bind(null, date, { nearestTo: 31 }),
+      RangeError
+    )
+    assert.throws(
+      roundToNearestMinutes.bind(null, date, { nearestTo: 0 }),
+      RangeError
+    )
+  })
+})