add a dummy class so that the imported namespace is utilized

Author: ashnazg

tests/unit/Types/ContextFactoryTest.php

@@ -197,6 +197,12 @@ public function tearDown()
 }
 
 namespace phpDocumentor\Reflection\Types\Mock {
+
     // the following import should not show in the tests above
+    use phpDocumentor\Reflection\DocBlock\Description;
 
+    class Foo extends Description
+    {
+        // dummy class
     }
+}