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import contextlib import re import sys def eq_(a, b, msg=None): """Assert a == b, with repr messaging on failure.""" assert a == b, msg or "%r != %r" % (a, b) def ne_(a, b, msg=None): """Assert a != b, with repr messaging on failure.""" assert a != b, msg or "%r == %r" % (a, b) def in_(a, b, msg=None): """Assert a in b, with repr messaging on failure.""" assert a in b, msg or "%r not in %r" % (a, b) def not_in(a, b, msg=None): """Assert a in not b, with repr messaging on failure.""" assert a not in b, msg or "%r is in %r" % (a, b) def _assert_proper_exception_context(exception): """assert that any exception we're catching does not have a __context__ without a __cause__, and that __suppress_context__ is never set. Python 3 will report nested as exceptions as "during the handling of error X, error Y occurred". That's not what we want to do. We want these exceptions in a cause chain. """ if ( exception.__context__ is not exception.__cause__ and not exception.__suppress_context__ ): assert False, ( "Exception %r was correctly raised but did not set a cause, " "within context %r as its cause." % (exception, exception.__context__) ) def _assert_proper_cause_cls(exception, cause_cls): """assert that any exception we're catching does not have a __context__ without a __cause__, and that __suppress_context__ is never set. Python 3 will report nested as exceptions as "during the handling of error X, error Y occurred". That's not what we want to do. We want these exceptions in a cause chain. """ assert isinstance(exception.__cause__, cause_cls), ( "Exception %r was correctly raised but has cause %r, which does not " "have the expected cause type %r." % (exception, exception.__cause__, cause_cls) ) def assert_raises(except_cls, callable_, *args, **kw): return _assert_raises(except_cls, callable_, args, kw) def assert_raises_with_proper_context(except_cls, callable_, *args, **kw): return _assert_raises(except_cls, callable_, args, kw, check_context=True) def assert_raises_with_given_cause( except_cls, cause_cls, callable_, *args, **kw ): return _assert_raises(except_cls, callable_, args, kw, cause_cls=cause_cls) def assert_raises_message(except_cls, msg, callable_, *args, **kwargs): return _assert_raises(except_cls, callable_, args, kwargs, msg=msg) def assert_raises_message_with_proper_context( except_cls, msg, callable_, *args, **kwargs ): return _assert_raises( except_cls, callable_, args, kwargs, msg=msg, check_context=True ) def assert_raises_message_with_given_cause( except_cls, msg, cause_cls, callable_, *args, **kwargs ): return _assert_raises( except_cls, callable_, args, kwargs, msg=msg, cause_cls=cause_cls ) def _assert_raises( except_cls, callable_, args, kwargs, msg=None, check_context=False, cause_cls=None, ): with _expect_raises(except_cls, msg, check_context, cause_cls) as ec: callable_(*args, **kwargs) return ec.error class _ErrorContainer: error = None @contextlib.contextmanager def _expect_raises(except_cls, msg=None, check_context=False, cause_cls=None): ec = _ErrorContainer() if check_context: are_we_already_in_a_traceback = sys.exc_info()[0] try: yield ec success = False except except_cls as err: ec.error = err success = True if msg is not None: # I'm often pdbing here, and "err" above isn't # in scope, so assign the string explicitly error_as_string = str(err) assert re.search(msg, error_as_string, re.UNICODE), "%r !~ %s" % ( msg, error_as_string, ) if cause_cls is not None: _assert_proper_cause_cls(err, cause_cls) if check_context and not are_we_already_in_a_traceback: _assert_proper_exception_context(err) print(str(err).encode("utf-8")) # it's generally a good idea to not carry traceback objects outside # of the except: block, but in this case especially we seem to have # hit some bug in either python 3.10.0b2 or greenlet or both which # this seems to fix: # https://github.com/python-greenlet/greenlet/issues/242 del ec # assert outside the block so it works for AssertionError too ! assert success, "Callable did not raise an exception" def expect_raises(except_cls, check_context=False): return _expect_raises(except_cls, check_context=check_context) def expect_raises_message(except_cls, msg, check_context=False): return _expect_raises(except_cls, msg=msg, check_context=check_context) def expect_raises_with_proper_context(except_cls, check_context=True): return _expect_raises(except_cls, check_context=check_context) def expect_raises_message_with_proper_context( except_cls, msg, check_context=True ): return _expect_raises(except_cls, msg=msg, check_context=check_context)
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