diff -r 000000000000 -r 6474c204b198 dom/bindings/parser/tests/test_stringifier.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/bindings/parser/tests/test_stringifier.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,46 @@
+import WebIDL
+
+def WebIDLTest(parser, harness):
+    parser.parse("""
+        interface TestStringifier {
+          stringifier;
+        };
+    """)
+
+    results = parser.finish()
+
+    harness.ok(isinstance(results[0].members[0], WebIDL.IDLMethod),
+               "Stringifer should be method")
+
+    parser = parser.reset()
+
+    threw = False
+    try:
+        parser.parse("""
+            interface TestStringifier {
+              stringifier;
+              stringifier;
+            };
+        """)
+        results = parser.finish()
+    except:
+        threw = True
+
+    harness.ok(threw, "Should not allow two 'stringifier;'")
+
+    parser = parser.reset()
+
+    threw = False
+    try:
+        parser.parse("""
+            interface TestStringifier {
+              stringifier;
+              stringifier DOMString foo();
+            };
+        """)
+        results = parser.finish()
+    except:
+        threw = True
+
+    harness.ok(threw, "Should not allow a 'stringifier;' and a 'stringifier()'")
+