gecko-dev/dom/bindings/parser/tests/test_enum_duplicate_values.py

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")