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def WebIDLTest(parser, harness):
parser.parse(
"""
interface Foo;
interface Bar;
interface Foo;
"""
)
results = parser.finish()
# There should be no duplicate interfaces in the result.
expectedNames = sorted(["Foo", "Bar"])
actualNames = sorted(map(lambda iface: iface.identifier.name, results))
harness.check(
actualNames, expectedNames, "Parser shouldn't output duplicate names."
)