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class AppTestReduce:
def test_None(self):
raises(TypeError, reduce, lambda x, y: x+y, [1,2,3], None)
def test_sum(self):
assert reduce(lambda x, y: x+y, [1,2,3,4], 0) == 10
assert reduce(lambda x, y: x+y, [1,2,3,4]) == 10
def test_minus(self):
assert reduce(lambda x, y: x-y, [10, 2, 8]) == 0
assert reduce(lambda x, y: x-y, [2, 8], 10) == 0
def test_from_cpython(self):
class SequenceClass(object):
def __init__(self, n):
self.n = n
def __getitem__(self, i):
if 0 <= i < self.n:
return i
else:
raise IndexError
from operator import add
assert reduce(add, SequenceClass(5)) == 10
assert reduce(add, SequenceClass(5), 42) == 52
raises(TypeError, reduce, add, SequenceClass(0))
assert reduce(add, SequenceClass(0), 42) == 42
assert reduce(add, SequenceClass(1)) == 0
assert reduce(add, SequenceClass(1), 42) == 42
d = {"one": 1, "two": 2, "three": 3}
assert reduce(add, d) == "".join(d.keys())
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