1 files changed, 31 insertions, 0 deletions
diff --git a/date-fns/src/isSaturday/test.ts b/date-fns/src/isSaturday/test.ts
new file mode 100644
index 0000000..223d775
--- /dev/null
+++ b/date-fns/src/isSaturday/test.ts
@@ -0,0 +1,31 @@
+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import isSaturday from '.'
+
+describe('isSaturday', function() {
+  it('returns true if the given date is Saturday', function() {
+    const result = isSaturday(new Date(2014, 8 /* Sep */, 27))
+    assert(result === true)
+  })
+
+  it('returns false if the given date is not Saturday', function() {
+    const result = isSaturday(new Date(2014, 8 /* Sep */, 25))
+    assert(result === false)
+  })
+
+  it('accepts a timestamp', function() {
+    const result = isSaturday(new Date(2014, 1 /* Feb */, 15).getTime())
+    assert(result === true)
+  })
+
+  it('returns false if the given date is `Invalid Date`', function() {
+    const result = isSaturday(new Date(NaN))
+    assert(result === false)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(isSaturday.bind(null), TypeError)
+  })
+})