#!/usr/bin/env python
""" @package eWRT.util.assert
Assertion based counters
Examples: see unittests
"""
# (C)opyrights 2011 by Albert Weichselbraun <albert@weichselbraun.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
__author__ = "Albert Weichselbraun"
__revision__ = "$Id$"
__copyright__ = "GPL"
from time import time
from collections import Counter
[docs]class AssertReturnValue(object):
""" decorator class used to time functions """
def __init__(self, evalExpression, counterNameTrue, counterNameFalse):
"""
@param evalExpression: the expression to verify (e.g. x>12);
@note evalExpression uses the variable x for the return value
@param counterNameTrue: counter to increase if the condition is true
@param counterNameFalse:counter to increase if the condition is false
"""
self.fn = None
self.evalExpression = evalExpression
self.counterNameTrue = counterNameTrue
self.counterNameFalse = counterNameFalse
self.counter = Counter()
def _assertReturnValue(self, x):
if eval(self.evalExpression):
self.counter[self.counterNameTrue] += 1
else:
self.counter[self.counterNameFalse] += 1
def __call__(self, fn):
"""
returns the wrapper object which is called instead of the original
function ones the decorator is used.
"""
def wrapper(*fargs, **kw):
returnValue = self.fn(*fargs, **kw)
self._assertReturnValue(returnValue)
return returnValue
# Save wrapped function reference
self.fn = fn
wrapper.__name__ = fn.__name__
wrapper.__dict__.update(fn.__dict__)
wrapper.__doc__ = fn.__doc__
wrapper.counter = self.counter
return wrapper
[docs]class TestAssertReturnValue(object):
@AssertReturnValue("int(x)>12", "countPassed", "countFailed")
def _assertReturnValue(self, value):
return value
[docs] def testAssertCounter(self):
"""
verifies the assertion counters
"""
self._assertReturnValue(24)
assert self._assertReturnValue.counter['countPassed'] == 1
assert self._assertReturnValue.counter['countFailed'] == 0
self._assertReturnValue(-2)
assert self._assertReturnValue.counter['countPassed'] == 1
assert self._assertReturnValue.counter['countFailed'] == 1