def test_delete_at_should_return_false_when_guess_not_present(self):
m = Marker("")
assert not m.delete_first("5", list("1234"))
def test_delete_at_should_return_true_when_guess_present(self):
m = Marker("")
assert m.delete_first("3", list("1234"))
def test_delete_at_should_delete_when_guess_present(self):
m = Marker("")
lst = list("1234")
m.delete_first("3", lst)
assert list("124") == lst
