diff -r ea12a3bb4b33 -r 9ca946fc4f01 rt/emul/compacttest/src/test/java/org/apidesign/bck2brwsr/tck/ExceptionsTest.java
--- a/rt/emul/compacttest/src/test/java/org/apidesign/bck2brwsr/tck/ExceptionsTest.java	Tue Feb 24 11:12:53 2015 +0100
+++ b/rt/emul/compacttest/src/test/java/org/apidesign/bck2brwsr/tck/ExceptionsTest.java	Tue Apr 19 07:24:30 2016 +0200
@@ -54,6 +54,17 @@
         int newLine = s.indexOf('\n');
         return s.substring(0, newLine);
     }
+
+    @Compare
+    public String classCastMessage() throws Exception {
+        Object obj = 10;
+        try {
+            return (String) obj;
+        } catch (ClassCastException ex) {
+            assert ex.getMessage().contains("cannot be cast to") : "Contains the right text: " + ex.getMessage();
+            throw ex;
+        }
+    }
     
     static class MyException extends Exception {
         public MyException(String message) {