diff --git a/is-lower-case/is-lower-case-tests.ts b/is-lower-case/is-lower-case-tests.ts
new file mode 100644
index 000000000..6b37359cc
--- /dev/null
+++ b/is-lower-case/is-lower-case-tests.ts
@@ -0,0 +1,7 @@
+/// <reference path="is-lower-case.d.ts" />
+
+import isLowerCase = require('is-lower-case')
+
+console.log(isLowerCase('string')); // => true
+console.log(isLowerCase('String')); // => false
+console.log(isLowerCase('STRING')); // => false