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import warnings
from testfixtures import Comparison as C, compare
class ShouldWarn(warnings.catch_warnings):
"""
This context manager is used to assert that warnings are issued
within the context it is managing.
:param expected: This should be a sequence made up of one or more elements,
each of one of the following types:
* A warning class, indicating that the type
of the warnings is important but not the
parameters it is created with.
* A warning instance, indicating that a
warning exactly matching the one supplied
should have been issued.
If no expected warnings are passed, you will need to inspect
the contents of the list returned by the context manager.
"""
_empty_okay = False
def __init__(self, *expected):
super(ShouldWarn, self).__init__(record=True)
self.expected = [C(e) for e in expected]
def __enter__(self):
self.recorded = super(ShouldWarn, self).__enter__()
warnings.simplefilter("always")
return self.recorded
def __exit__(self, exc_type, exc_val, exc_tb):
super(ShouldWarn, self).__exit__(exc_type, exc_val, exc_tb)
if not self.recorded and self._empty_okay:
return
if not self.expected and self.recorded and not self._empty_okay:
return
compare(self.expected, actual=[wm.message for wm in self.recorded])
class ShouldNotWarn(ShouldWarn):
"""
This context manager is used to assert that no warnings are issued
within the context it is managing.
"""
_empty_okay = True
def __init__(self):
super(ShouldNotWarn, self).__init__()