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diff --git a/date-fns/src/isLeapYear/test.ts b/date-fns/src/isLeapYear/test.ts
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+++ b/date-fns/src/isLeapYear/test.ts
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import isLeapYear from '.'
+
+describe('isLeapYear', function() {
+  it('returns true if the given date is in the leap year', function() {
+    const result = isLeapYear(new Date(2012, 6 /* Jul */, 2))
+    assert(result === true)
+  })
+
+  it('returns false if the given date is not in the leap year', function() {
+    const result = isLeapYear(new Date(2014, 6 /* Jul */, 2))
+    assert(result === false)
+  })
+
+  it('works for the years divisible by 100 but not by 400', function() {
+    const result = isLeapYear(new Date(2100, 6 /* Jul */, 2))
+    assert(result === false)
+  })
+
+  it('works for the years divisible by 400', function() {
+    const result = isLeapYear(new Date(2000, 6 /* Jul */, 2))
+    assert(result === true)
+  })
+
+  it('accepts a timestamp', function() {
+    var date = new Date(2012, 6 /* Jul */, 2).getTime()
+    const result = isLeapYear(date)
+    assert(result === true)
+  })
+
+  it('returns false if the given date is `Invalid Date`', function() {
+    const result = isLeapYear(new Date(NaN))
+    assert(result === false)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(isLeapYear.bind(null), TypeError)
+  })
+})