def test_launch_description_visit():
"""Test visiting entities in the LaunchDescription class."""
ld = LaunchDescription([LaunchDescriptionEntity()])
ld.add_action(Action())
result = ld.visit(MockLaunchContext())
assert isinstance(result, collections.abc.Iterable)
for entity in result:
assert isinstance(entity, LaunchDescriptionEntity)
def test_launch_description_deprecated():
ld = LaunchDescription(deprecated_reason='DEPRECATED MESSAGE')
ld.visit(MockLaunchContext())
assert ld.deprecated is True
assert ld.deprecated_reason == 'DEPRECATED MESSAGE'
