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diff --git a/date-fns/src/lightFormat/test.ts b/date-fns/src/lightFormat/test.ts
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'assert'
+import lightFormat from '.'
+
+describe('lightFormat', () => {
+  const date = new Date(1986, 3 /* Apr */, 4, 10, 32, 55, 123)
+
+  it('accepts a timestamp', () => {
+    const date = new Date(2014, 3, 4).getTime()
+    assert(lightFormat(date, 'yyyy-MM-dd') === '2014-04-04')
+  })
+
+  it('escapes characters between the single quote characters', () => {
+    const result = lightFormat(date, "'yyyy-'MM-dd'D yyyy-'MM-dd'")
+    assert(result === 'yyyy-04-04D yyyy-04-04')
+  })
+
+  it('two single quote characters are transformed into a "real" single quote', () => {
+    const date = new Date(2014, 3, 4, 5)
+    assert(lightFormat(date, "''h 'o''clock'''") === "'5 o'clock'")
+  })
+
+  it('accepts new line charactor', function () {
+    const date = new Date(2014, 3, 4, 5)
+    assert.equal(
+      lightFormat(date, "yyyy-MM-dd'\n'HH:mm:ss"),
+      '2014-04-04\n05:00:00'
+    )
+  })
+
+  describe('year', () => {
+    describe('regular year', () => {
+      it('works as expected', () => {
+        const result = lightFormat(date, 'y yy yyy yyyy yyyyy')
+        assert(result === '1986 86 1986 1986 01986')
+      })
+
+      it('1 BC formats as 1', () => {
+        const date = new Date(0)
+        date.setFullYear(0 /* Jan */, 1)
+        date.setHours(0, 0, 0, 0)
+        const result = lightFormat(date, 'y')
+        assert(result === '1')
+      })
+
+      it('2 BC formats as 2', () => {
+        const date = new Date(0)
+        date.setFullYear(-1, 0 /* Jan */, 1)
+        date.setHours(0, 0, 0, 0)
+        const result = lightFormat(date, 'y')
+        assert(result === '2')
+      })
+    })
+  })
+
+  describe('month', () => {
+    it('formatting month', () => {
+      const result = lightFormat(date, 'M MM')
+      assert(result === '4 04')
+    })
+  })
+
+  describe('day', () => {
+    it('date', () => {
+      const result = lightFormat(date, 'd dd')
+      assert(result === '4 04')
+    })
+  })
+
+  describe('hour', () => {
+    it('hour [1-12]', () => {
+      const result = lightFormat(
+        new Date(2018, 0 /* Jan */, 1, 0, 0, 0, 0),
+        'h hh'
+      )
+      assert(result === '12 12')
+    })
+
+    it('hour [0-23]', () => {
+      const result = lightFormat(
+        new Date(2018, 0 /* Jan */, 1, 0, 0, 0, 0),
+        'H HH'
+      )
+      assert(result === '0 00')
+    })
+
+    describe('AM, PM', () => {
+      it('works as expected', () => {
+        const result = lightFormat(
+          new Date(2018, 0 /* Jan */, 1, 0, 0, 0, 0),
+          'a aa aaa aaaa aaaaa'
+        )
+        assert(result === 'AM AM am a.m. a')
+      })
+
+      it('12 PM', () => {
+        const date = new Date(1986, 3 /* Apr */, 4, 12, 0, 0, 900)
+        assert(lightFormat(date, 'h H a') === '12 12 PM')
+      })
+
+      it('12 AM', () => {
+        const date = new Date(1986, 3 /* Apr */, 6, 0, 0, 0, 900)
+        assert(lightFormat(date, 'h H a') === '12 0 AM')
+      })
+    })
+  })
+
+  it('minute', () => {
+    const result = lightFormat(date, 'm mm')
+    assert(result === '32 32')
+  })
+
+  describe('second', () => {
+    it('second', () => {
+      const result = lightFormat(date, 's ss')
+      assert(result === '55 55')
+    })
+  })
+
+  it('fractional seconds', function () {
+    const result = lightFormat(date, 'S SS SSS SSSS')
+    assert(result === '1 12 123 1230')
+  })
+
+  it('returns empty string when the format is an empty string', () => {
+    assert(lightFormat(Date.now(), '') === '')
+  })
+
+  it("throws RangeError if the date isn't valid", () => {
+    assert.throws(
+      lightFormat.bind(null, new Date(NaN), 'MMMM d, yyyy'),
+      RangeError
+    )
+  })
+
+  it('implicitly converts `formatString`', () => {
+    // eslint-disable-next-line no-new-wrappers
+    const formatString = new String('yyyy-MM-dd')
+
+    const date = new Date(2014, 3, 4)
+
+    // @ts-expect-error
+    assert(lightFormat(date, formatString) === '2014-04-04')
+  })
+
+  it('throws RangeError exception if the format string contains an unescaped latin alphabet character', function () {
+    assert.throws(lightFormat.bind(null, date, 'yyyy-MM-dd-nnnn'), RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 2 arguments', () => {
+    // @ts-expect-error
+    assert.throws(lightFormat.bind(null), TypeError)
+    // @ts-expect-error
+    assert.throws(lightFormat.bind(null, 1), TypeError)
+  })
+})