def test_filter_str():
def iseven(x):
return x % 2 == 0
source = Stream()
s = source.filter(iseven)
assert str(s) == '<filter: iseven>'
def test_filter_str():
def add(x=0, y=0):
return x + y
source = Stream()
s = source.filter(add)
assert str(s) == '<filter; predicate=add>'
def test_filter_none():
source = Stream()
L = source.filter(None).sink_to_list()
for i in range(10):
source.emit(i % 3)
assert L == [1, 2, 1, 2, 1, 2]
def test_filter():
source = Stream()
L = source.filter(lambda x: x % 2 == 0).sink_to_list()
for i in range(10):
source.emit(i)
assert L == [0, 2, 4, 6, 8]
def test_filter_kwargs():
source = Stream()
L = source.filter(lambda x, n=1: x % n == 0, n=2).sink_to_list()
for i in range(10):
source.emit(i)
assert L == [0, 2, 4, 6, 8]
