1 files changed, 16 insertions, 0 deletions
diff --git a/dom/bindings/parser/tests/test_argument_identifier_conflicts.py b/dom/bindings/parser/tests/test_argument_identifier_conflicts.py
new file mode 100644
index 0000000000..3ee8dc6bd6
--- /dev/null
+++ b/dom/bindings/parser/tests/test_argument_identifier_conflicts.py
@@ -0,0 +1,16 @@
+def WebIDLTest(parser, harness):
+    threw = False
+    try:
+        parser.parse(
+            """
+            interface ArgumentIdentifierConflict {
+              undefined foo(boolean arg1, boolean arg1);
+            };
+        """
+        )
+
+        parser.finish()
+    except Exception:
+        threw = True
+
+    harness.ok(threw, "Should have thrown.")