cirq.testing.assert_deprecated

Allows deprecated functions, classes, decorators in tests.

cirq.testing.assert_deprecated(
    *msgs,
    deadline: str = False,
    allow_multiple_warnings: bool = False
)

It acts as a contextmanager that can be used in with statements:

>>> with assert_deprecated("use cirq.x instead", deadline="v0.9"):
>>>     # do something deprecated

msgs messages that should match the warnings captured
deadline the expected deadline the feature will be deprecated by. Has to follow the format vX.Y (minor versions only)
allow_multiple_warnings if True, multiple warnings are accepted. Typically this should not be used, by default it's False.