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# Copyright 2022 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
from mojom_parser_test_case import MojomParserTestCase
class UnionTest(MojomParserTestCase):
"""Tests union parsing behavior."""
def testExtensibleMustHaveDefault(self):
"""Verifies that extensible unions must have a default field."""
mojom = 'foo.mojom'
self.WriteFile(mojom, 'module foo; [Extensible] union U { bool x; };')
with self.assertRaisesRegexp(Exception, 'must specify a \[Default\]'):
self.ParseMojoms([mojom])
def testExtensibleSingleDefault(self):
"""Verifies that extensible unions must not have multiple default fields."""
mojom = 'foo.mojom'
self.WriteFile(
mojom, """\
module foo;
[Extensible] union U {
[Default] bool x;
[Default] bool y;
};
""")
with self.assertRaisesRegexp(Exception, 'Multiple \[Default\] fields'):
self.ParseMojoms([mojom])
def testExtensibleDefaultTypeValid(self):
"""Verifies that an extensible union's default field must be nullable or
integral type."""
mojom = 'foo.mojom'
self.WriteFile(
mojom, """\
module foo;
[Extensible] union U {
[Default] handle<message_pipe> p;
};
""")
with self.assertRaisesRegexp(Exception, 'must be nullable or integral'):
self.ParseMojoms([mojom])
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