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diff --git a/date-fns/src/formatRFC7231/test.js b/date-fns/src/formatRFC7231/test.js
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+++ b/date-fns/src/formatRFC7231/test.js
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import formatRFC7231 from '.'
+
+describe('formatRFC7231', () => {
+  it('formats RFC-7231 date string', () => {
+    const date = new Date(Date.UTC(2019, 2, 3, 19, 0, 52))
+    assert(formatRFC7231(date) === 'Sun, 03 Mar 2019 19:00:52 GMT')
+  })
+
+  it('accepts a timestamp', () => {
+    const date = Date.UTC(2019, 9, 4, 12, 30, 13)
+    assert(formatRFC7231(date) === 'Fri, 04 Oct 2019 12:30:13 GMT')
+  })
+
+  it('throws RangeError if the time value is invalid', () => {
+    assert.throws(formatRFC7231.bind(null, new Date(NaN)), RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(formatRFC7231.bind(null), TypeError)
+  })
+})