diff --git a/upper-case/upper-case-tests.ts b/upper-case/upper-case-tests.ts
new file mode 100644
index 0000000000..7e1a4a0b53
--- /dev/null
+++ b/upper-case/upper-case-tests.ts
@@ -0,0 +1,9 @@
+/// <reference path="upper-case.d.ts" />
+
+import upperCase = require('upper-case');
+
+console.log(upperCase(null));       	 // => ""
+console.log(upperCase('string'));  	 // => "STRING"
+console.log(upperCase('string', 'tr'));	 // => "STRÄ°NG"
+
+console.log(upperCase({ toString: function() { return 'test' } })); // => "TEST"