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diff --git a/date-fns/src/endOfISOWeekYear/test.ts b/date-fns/src/endOfISOWeekYear/test.ts
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+++ b/date-fns/src/endOfISOWeekYear/test.ts
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import endOfISOWeekYear from '.'
+
+describe('endOfISOWeekYear', function() {
+  it('returns the date with the time set to 23:59:59.999 and the date set to the last day of an ISO year', function() {
+    const result = endOfISOWeekYear(new Date(2009, 0 /* Jan */, 1, 16, 0))
+    assert.deepEqual(result, new Date(2010, 0 /* Jan */, 3, 23, 59, 59, 999))
+  })
+
+  it('accepts a timestamp', function() {
+    const result = endOfISOWeekYear(
+      new Date(2005, 0 /* Jan */, 1, 6, 0).getTime()
+    )
+    assert.deepEqual(result, new Date(2005, 0 /* Jan */, 2, 23, 59, 59, 999))
+  })
+
+  it('does not mutate the original date', function() {
+    const date = new Date(2014, 6 /* Jul */, 2)
+    endOfISOWeekYear(date)
+    assert.deepEqual(date, new Date(2014, 6 /* Jul */, 2))
+  })
+
+  it('handles dates before 100 AD', function() {
+    const initialDate = new Date(0)
+    initialDate.setFullYear(5, 0 /* Jan */, 4)
+    initialDate.setHours(16, 0, 0, 0)
+    const expectedResult = new Date(0)
+    expectedResult.setFullYear(6, 0 /* Jan */, 1)
+    expectedResult.setHours(23, 59, 59, 999)
+    const result = endOfISOWeekYear(initialDate)
+    assert.deepEqual(result, expectedResult)
+  })
+
+  it('returns `Invalid Date` if the given date is invalid', function() {
+    const result = endOfISOWeekYear(new Date(NaN))
+    //@ts-expect-error
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(endOfISOWeekYear.bind(null), TypeError)
+  })
+})