def test_doubler():
d = gen.doubler()
assert next(d) == 1
assert next(d) == 2
assert next(d) == 4
assert next(d) == 8
assert next(d) == 16
assert next(d) == 32
def test_doubler():
d = doubler()
assert d.next() == 1
assert d.next() == 2
assert d.next() == 4
assert d.next() == 8
assert d.next() == 16
assert d.next() == 32
assert d.next() == 64
def test_doubler():
doubler_val = doubler()
doubler_list = []
for _ in range(7):
new_doubler = next(doubler_val)
doubler_list.append(new_doubler)
assert doubler_list == [1, 2, 4, 8, 16, 32, 64]
def test_doubler():
g = gen.doubler()
assert g.next() == 1
assert g.next() == 2
assert g.next() == 4
assert g.next() == 8
assert g.next() == 16
assert g.next() == 32
for i in range(10):
j = g.next()
assert j == 2**15
def test_doubler():
g = gen.doubler()
assert next(g) == 1
assert next(g) == 2
assert next(g) == 4
assert next(g) == 8
assert next(g) == 16
assert next(g) == 32
for i in range(10):
j = next(g)
assert j == 2**15
def test_doubler():
gen2 = g.doubler(47)
for i in gen2:
print(i)
