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class DummyCM(object):
"""Explicit structure of a context manager.
Allows to monkey-patch context managers defined through
@contextmanager decorator.
value: holds whatever the context manager should yield.
"""
value = None
def __init__(self, *args, **kwargs):
pass
def __enter__(self):
return self
def __exit__(self, *args, **kwargs):
pass
def __getattr__(self, attr):
return self.value.__getattribute__(attr)
class BaseTx(DummyCM, str):
def __iadd__(self, other):
"""support for += operator to make os.path.join work
with the value yielded by the dummy context manager"""
return self.value + other
def __str__(self):
return self.value
class DummyTxTmpdir(BaseTx):
value = 'foo' # path that dummy tx_tmpdir "yields"
class DummyFileTransaction(BaseTx):
value = 'tx_file'
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