diff -r d382dacfd73f -r 81e8d956290c rt/vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java
--- a/rt/vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java	Tue Feb 26 16:54:16 2013 +0100
+++ b/rt/vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java	Wed Feb 27 16:14:14 2013 +0100
@@ -68,9 +68,9 @@
                 ret = code.invokeMethod(ret, "toFP");
                 ret = code.invokeFunction("Number", ret);
             } catch (ScriptException ex) {
-                fail("Conversion to number failed in " + dumpJS(codeSeq), ex);
+                fail("Conversion to number failed in " + dumpJS(codeSeq) + ": " + ex.getMessage(), ex);
             } catch (NoSuchMethodException ex) {
-                fail("Cannot find global Number(x) function in " + dumpJS(codeSeq), ex);
+                fail("Cannot find global Number(x) function in " + dumpJS(codeSeq) + ": " + ex.getMessage(), ex);
             }
         }
         return ret;