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diff --git a/date-fns/src/isSameISOWeekYear/test.ts b/date-fns/src/isSameISOWeekYear/test.ts
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+++ b/date-fns/src/isSameISOWeekYear/test.ts
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import isSameISOWeekYear from '.'
+
+describe('isSameISOWeekYear', function() {
+  it('returns true if the given dates have the same ISO week-numbering year', function() {
+    const result = isSameISOWeekYear(
+      new Date(2003, 11 /* Dec */, 29),
+      new Date(2005, 0 /* Jan */, 2)
+    )
+    assert(result === true)
+  })
+
+  it('returns false if the given dates have different ISO week-numbering years', function() {
+    const result = isSameISOWeekYear(
+      new Date(2014, 11 /* Dec */, 28),
+      new Date(2014, 11 /* Dec */, 29)
+    )
+    assert(result === false)
+  })
+
+  it('accepts a timestamp', function() {
+    const result = isSameISOWeekYear(
+      new Date(2003, 11 /* Dec */, 29).getTime(),
+      new Date(2005, 0 /* Jan */, 2).getTime()
+    )
+    assert(result === true)
+  })
+
+  it('handles dates before 100 AD', function() {
+    const firstDate = new Date(0)
+    firstDate.setFullYear(5, 0 /* Jan */, 1)
+    firstDate.setHours(0, 0, 0, 0)
+    const secondDate = new Date(0)
+    secondDate.setFullYear(5, 0 /* Jan */, 2)
+    secondDate.setHours(0, 0, 0, 0)
+    const result = isSameISOWeekYear(firstDate, secondDate)
+    assert(result === true)
+  })
+
+  it('returns false if the first date is `Invalid Date`', function() {
+    const result = isSameISOWeekYear(
+      new Date(NaN),
+      new Date(1989, 6 /* Jul */, 10)
+    )
+    assert(result === false)
+  })
+
+  it('returns false if the second date is `Invalid Date`', function() {
+    const result = isSameISOWeekYear(
+      new Date(1987, 1 /* Feb */, 11),
+      new Date(NaN)
+    )
+    assert(result === false)
+  })
+
+  it('returns false if the both dates are `Invalid Date`', function() {
+    const result = isSameISOWeekYear(new Date(NaN), new Date(NaN))
+    assert(result === false)
+  })
+
+  it('throws TypeError exception if passed less than 2 arguments', function() {
+    assert.throws(isSameISOWeekYear.bind(null), TypeError)
+    assert.throws(isSameISOWeekYear.bind(null, 1), TypeError)
+  })
+})