New submission from Jay Moorthi <moor...@gmail.com>:
It would be useful to have a new assert method in the unittest.TestCase class
that checks to see if a value has changed. I wrote a quick and dirty version
like so:
class MySpecialTestCase(unittest.TestCase):
@contextmanager
def assertChanges(self, thing, attr=None, by=None):
def get_value(thing, attr):
if callable(thing):
value = thing()
else:
value = getattr(thing, attr)
return value
old_value = get_value(thing, attr)
yield
new_value = get_value(thing, attr)
if by is None:
self.assertNotEqual(new_value, old_value)
else:
self.assertEqual(new_value - old_value, by)
I'm sure something better can be done to take better advantage of the unittest
module's diffing tools, etc.
----------
messages: 123745
nosy: Jay.Moorthi
priority: normal
severity: normal
status: open
title: unittest should have an assertChanges context manager
type: feature request
versions: Python 2.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10675>
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