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diff --git a/date-fns/src/formatRFC3339/test.js b/date-fns/src/formatRFC3339/test.js
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import formatRFC3339 from '.'
+import toInteger from '../_lib/toInteger/index'
+import addLeadingZeros from '../_lib/addLeadingZeros/index'
+
+// This makes sure we create the consistent offsets across timezones, no matter where these tests are ran.
+function generateOffset(date) {
+  let offset = ''
+  const tzOffset = date.getTimezoneOffset()
+
+  if (tzOffset !== 0) {
+    const absoluteOffset = Math.abs(tzOffset)
+    const hourOffset = addLeadingZeros(toInteger(absoluteOffset / 60), 2)
+    const minuteOffset = addLeadingZeros(absoluteOffset % 60, 2)
+    // If less than 0, the sign is +, because it is ahead of time.
+    const sign = tzOffset < 0 ? '+' : '-'
+
+    offset = `${sign}${hourOffset}:${minuteOffset}`
+  } else {
+    offset = 'Z'
+  }
+
+  return offset
+}
+
+describe('formatRFC3339', () => {
+  it('formats RFC-3339 date string', () => {
+    var date = new Date(2019, 2 /* Mar */, 3, 19, 0, 52, 123)
+    assert(formatRFC3339(date) === `2019-03-03T19:00:52${generateOffset(date)}`)
+  })
+
+  it('accepts a timestamp', function() {
+    var date = new Date(2019, 9 /* Oct */, 4, 12, 30, 13, 456)
+    var time = date.getTime()
+    assert(formatRFC3339(time) === `2019-10-04T12:30:13${generateOffset(date)}`)
+  })
+
+  it('allows to specify digits of second fractions', function() {
+    var date = new Date(2019, 11 /* Dec */, 11, 1, 0, 0, 789)
+    assert(
+      formatRFC3339(date, { fractionDigits: 3 }) ===
+        `2019-12-11T01:00:00.789${generateOffset(date)}`
+    )
+  })
+
+  it('works when ms < 100', function() {
+    var date = new Date(2019, 11 /* Dec */, 11, 1, 0, 0, 12)
+    assert(
+      formatRFC3339(date, { fractionDigits: 2 }) ===
+        `2019-12-11T01:00:00.01${generateOffset(date)}`
+    )
+  })
+
+  it('implicitly converts options', function() {
+    var date = new Date(2019, 2 /* Mar */, 3, 19, 0, 52, 123)
+    // $ExpectedMistake
+    var result = formatRFC3339(date, {
+      fractionDigits: '2'
+    })
+    assert.equal(result, `2019-03-03T19:00:52.12${generateOffset(date)}`)
+  })
+
+  it('throws `RangeError` if `options.fractionDigits` is not convertable to 0, 1, 2, 3 or undefined', function() {
+    // $ExpectedMistake
+    var block = formatRFC3339.bind(null, new Date(2019, 2 /* Mar */, 3), {
+      fractionDigits: NaN
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws RangeError if the time value is invalid', () => {
+    assert.throws(formatRFC3339.bind(null, new Date(NaN)), RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(formatRFC3339.bind(null), TypeError)
+  })
+})