1 files changed, 31 insertions, 0 deletions
diff --git a/date-fns/src/isValid/test.js b/date-fns/src/isValid/test.js
new file mode 100644
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+++ b/date-fns/src/isValid/test.js
@@ -0,0 +1,31 @@
+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import isValid from '.'
+
+describe('isValid', function() {
+  it('returns true if the given date is valid', function() {
+    var result = isValid(new Date())
+    assert(result === true)
+  })
+
+  it('returns false if the given date is invalid', function() {
+    var result = isValid(new Date(''))
+    assert(result === false)
+  })
+
+  it('accepts a timestamp', function() {
+    assert(isValid(new Date(2014, 1 /* Feb */, 11).getTime()) === true)
+    assert(isValid(NaN) === false)
+  })
+
+  it('treats null as an invalid date', function() {
+    var result = isValid(null)
+    assert(result === false)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(isValid.bind(null), TypeError)
+  })
+})