def test_execution_order():
L = []
for i in range(5):
s = Stream()
b = s.pluck(1)
a = s.pluck(0)
li = a.combine_latest(b, emit_on=a).sink_to_list()
z = [(1, 'red'), (2, 'blue'), (3, 'green')]
for zz in z:
s.emit(zz)
L.append((li, ))
for ll in L:
assert ll == L[0]
L2 = []
for i in range(5):
s = Stream()
a = s.pluck(0)
b = s.pluck(1)
li = a.combine_latest(b, emit_on=a).sink_to_list()
z = [(1, 'red'), (2, 'blue'), (3, 'green')]
for zz in z:
s.emit(zz)
L2.append((li, ))
for ll, ll2 in zip(L, L2):
assert ll2 == L2[0]
assert ll != ll2
def test_pluck():
a = Stream()
L = a.pluck(1).sink_to_list()
a.emit([1, 2, 3])
assert L == [2]
a.emit([4, 5, 6, 7, 8, 9])
assert L == [2, 5]
with pytest.raises(IndexError):
a.emit([1])
def test_pluck_list():
a = Stream()
L = a.pluck([0, 2]).sink_to_list()
a.emit([1, 2, 3])
assert L == [(1, 3)]
a.emit([4, 5, 6, 7, 8, 9])
assert L == [(1, 3), (4, 6)]
with pytest.raises(IndexError):
a.emit([1])
