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from unittest import TestCase
from test import test_support
class Bucket(object):
def __init__(self, value):
self.__value = value
def _get(self):
return self.__value
def _set(self, value):
assert self.__value == value, "Value changed!"
value = property(_get,_set)
class PropBucket(object):
def __init__(self):
self.__dict__['_d'] = {}
def __getattr__(self, attr):
value = self._d.setdefault(attr, 0)
self._d[attr] = value + 1
return Bucket(value)
def __setattr__(self, attr, value):
value.append(attr)
class EvaluationOrder(TestCase):
def test_TestFunctionality(self):
bucket = PropBucket()
try:
bucket.prop.value = bucket.prop.value + 0
except AssertionError:
pass
else:
assert False, "PropBucket is not working"
def test_augassign(self):
bucket = PropBucket()
bucket.prop.value += 0
def test_AssignOrder(self):
bucket = PropBucket()
expected = ['one','two','three']
result = []
bucket.one = bucket.two = bucket.three = result
assert result == expected, "expected %s, got %s" % (expected, result)
def test_operands(self):
m = [(2,), (1,)].pop
assert m() + m() == (1,2), "faulty operand order"
def test_arguments(self):
def one(a,b,c,d,*extra):
return reduce(lambda r,x: r+x,extra,a+b+c+d)
m = list((x,) for x in xrange(100,0,-1)).pop
value = one(m(),m(),m(),m())
assert value == (1,2,3,4), "simple call, got: %s " % (value,)
value = one(m(),m(),d=m(),c=m())
assert value == (5,6,8,7), "call with keywords, got: %s" % (value,)
value = one(m(),m(),m(),m(),m(),m())
assert value == (9,10,11,12,13,14), "long call, got: %s" % (value,)
value = one(m(),m(),*[m(),m(),m(),m()])
assert value == (15,16,17,18,19,20), "varcalls, got: %s" % (value,)
value = one(m(),m(),**dict(c=m(),d=m()))
assert value == (21,22,23,24), "varkeywordcall, got: %s" % (value,)
value = one(*[m(),m()],**dict(c=m(),d=m()))
assert value == (25,26,27,28), "bothvarcalls, got: %s" % (value,)
def test_main():
test_support.run_unittest(EvaluationOrder)
if __name__ == '__main__':
test_main()
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