diff -r 000000000000 -r 6474c204b198 dom/bindings/parser/tests/test_enum_duplicate_values.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/bindings/parser/tests/test_enum_duplicate_values.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+import WebIDL
+
+def WebIDLTest(parser, harness):
+    try:
+        parser.parse("""
+            enum TestEnumDuplicateValue {
+              "",
+              ""
+            };
+        """)
+        harness.ok(False, "Should have thrown!")
+    except:
+        harness.ok(True, "Enum TestEnumDuplicateValue should throw")