diff -r 860933a7787f -r 25e350c6385f vm/src/test/java/org/apidesign/vm4brwsr/ClassTest.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/ClassTest.java	Thu Nov 29 21:58:17 2012 +0100
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/ClassTest.java	Sat Dec 01 08:52:30 2012 +0100
@@ -44,6 +44,12 @@
         assertExec("Classes are not equal", Classes.class, "differenceInClassesZ", Double.valueOf(1.0));
     }
 
+    @Test public void javaInstanceName() throws Exception {
+        assertEquals(Classes.classForInstance(), "java.io.IOException");
+    }
+    @Test public void jsInstanceName() throws Exception {
+        assertExec("I/O name", Classes.class, "classForInstanceLjava_lang_String", "java.io.IOException");
+    }
     @Test public void javaName() throws Exception {
         assertEquals(Classes.name(), "java.io.IOException");
     }