diff -r a82e89aae050 -r 7efb52f76270 vm/src/test/java/org/apidesign/vm4brwsr/InstanceTest.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/InstanceTest.java	Mon Sep 24 11:22:50 2012 +0200
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/InstanceTest.java	Tue Sep 25 12:26:29 2012 +0200
@@ -87,6 +87,21 @@
         );
     }
     
+    @Test public void verifyCastToClass() throws Exception {
+        assertExec(
+            "Five signals all is good",
+            "org_apidesign_vm4brwsr_Instance_castsWorkIZ",
+            Double.valueOf(5.0), false
+        );
+    }
+    @Test public void verifyCastToInterface() throws Exception {
+        assertExec(
+            "Five signals all is good",
+            "org_apidesign_vm4brwsr_Instance_castsWorkIZ",
+            Double.valueOf(5.0), true
+        );
+    }
+    
     private static void assertExec(String msg, String methodName, Object expRes, Object... args) throws Exception {
         StringBuilder sb = new StringBuilder();
         Invocable i = StaticMethodTest.compileClass(sb,