def WebIDLTest(parser, harness):
parser.parse(
"""
interface Foo {
undefined foo(object constructor);
};
"""
)
results = parser.finish()
harness.check(len(results), 1, "Should have an interface")
iface = results[0]
harness.check(len(iface.members), 1, "Should have an operation")
operation = iface.members[0]
harness.check(len(operation.signatures()), 1, "Should have one signature")
(retval, args) = operation.signatures()[0]
harness.check(len(args), 1, "Should have an argument")
harness.check(
args[0].identifier.name,
"constructor",
"Should have an identifier named 'constructor'",
)