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# Copyright (C) 2010 Canonical Ltd
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Matchers for bzrlib.
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Primarily test support, Matchers are used by self.assertThat in the bzrlib
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test suite. A matcher is a stateful test helper which can be used to determine
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if a passed object 'matches', much like a regex. If the object does not match
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the mismatch can be described in a human readable fashion. assertThat then
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raises if a mismatch occurs, showing the description as the assertion error.
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Matchers are designed to be more reusable and composable than layered
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assertions in Test Case objects, so they are recommended for new testing work.
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from testtools.matchers import Mismatch, Matcher
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class ReturnsUnlockable(Matcher):
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"""A matcher that checks for the pattern we want lock* methods to have:
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They should return an object with an unlock() method.
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Calling that method should unlock the original object.
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:ivar lockable_thing: The object which can be locked that will be
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def __init__(self, lockable_thing):
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Matcher.__init__(self)
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self.lockable_thing = lockable_thing
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return ('ReturnsUnlockable(lockable_thing=%s)' %
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def match(self, lock_method):
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lock_method().unlock()
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if self.lockable_thing.is_locked():
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return _IsLocked(self.lockable_thing)
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class _IsLocked(Mismatch):
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"""Something is locked."""
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def __init__(self, lockable_thing):
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self.lockable_thing = lockable_thing
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return "%s is locked" % self.lockable_thing
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bzrlib/tests/matchers.py
