diff --git a/Tests/Unit/FunctionsTest.php b/Tests/Unit/FunctionsTest.php
index bc0a333..6b7af1f 100644
--- a/Tests/Unit/FunctionsTest.php
+++ b/Tests/Unit/FunctionsTest.php
@@ -14,6 +14,7 @@ class FunctionsTest extends TestCaseEnumerable
     function testInit ()
     {
         F::init();
+        $this->assertNotEmpty(F::$identity);
     }
 
     function testIdentity ()