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diff --git a/date-fns/src/formatISO9075/test.js b/date-fns/src/formatISO9075/test.js
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import formatISO9075 from '.'
+
+describe('formatISO9075', () => {
+  it('formats ISO-9075 extended date format', () => {
+    const date = new Date(2019, 2 /* Mar */, 3, 19, 0, 52, 123)
+    assert(formatISO9075(date) === '2019-03-03 19:00:52')
+  })
+
+  it('accepts a timestamp', () => {
+    const date = new Date(2019, 2 /* Mar */, 3, 19, 0, 52, 123).getTime()
+    assert(formatISO9075(date) === '2019-03-03 19:00:52')
+  })
+
+  it('formats ISO-8601 basic date format', () => {
+    const date = new Date(2019, 9 /* Oct */, 4, 12, 30, 13, 456)
+    assert(formatISO9075(date, { format: 'basic' }) === '20191004 123013')
+  })
+
+  it('formats only date', () => {
+    const date = new Date(2019, 11 /* Dec */, 11, 1, 0, 0, 789)
+    assert(
+      formatISO9075(date, { representation: 'date', format: 'extended' }) ===
+        '2019-12-11'
+    )
+    assert(
+      formatISO9075(date, { representation: 'date', format: 'basic' }) ===
+        '20191211'
+    )
+  })
+
+  it('formats only time', () => {
+    const date = new Date(2019, 2 /* Mar */, 3, 19, 0, 52, 123)
+    assert(
+      formatISO9075(date, { representation: 'time', format: 'extended' }) ===
+        '19:00:52'
+    )
+    assert(
+      formatISO9075(date, { representation: 'time', format: 'basic' }) ===
+        '190052'
+    )
+  })
+
+  describe('implicitly converts options', function() {
+    it('`format`', function() {
+      // eslint-disable-next-line no-new-wrappers
+      var format = new String('basic')
+      var date = new Date(2019, 9 /* Oct */, 4, 12, 30, 13, 456)
+      // $ExpectedMistake
+      var result = formatISO9075(date, { format: format })
+      assert(result === '20191004 123013')
+    })
+
+    it('`representation`', function() {
+      // eslint-disable-next-line no-new-wrappers
+      var representation = new String('time')
+      var date = new Date(2019, 9 /* Oct */, 4, 12, 30, 13, 456)
+      // $ExpectedMistake
+      var result = formatISO9075(date, { representation: representation })
+      assert(result === '12:30:13')
+    })
+  })
+
+  it("throws `RangeError` if `options.format` is not 'extended' or 'basic'", function() {
+    // $ExpectedMistake
+    var block = formatISO9075.bind(null, new Date(2019, 2 /* Mar */, 3), {
+      format: 'something else'
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it("throws `RangeError` if `options.representation` is not 'date', 'time' or 'complete'", function() {
+    // $ExpectedMistake
+    var block = formatISO9075.bind(null, new Date(2019, 2 /* Mar */, 3), {
+      representation: 'something else'
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws RangeError if the time value is invalid', () => {
+    assert.throws(formatISO9075.bind(null, new Date(NaN)), RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(formatISO9075.bind(null), TypeError)
+  })
+})