human
Solve the following python programming problem given the following code:
def test_wait_signal(qtbot) : 
    x = [] 
    def f() : 
        x.append (0) 
timer = QTimer () 
    timer.setInterval (100) 
    timer.setSingleShot (True) 
    timer.timeout.connect (f) 
    timer.start () 
    assert (x == []) 
    with _wait_signal (qtbot.timeout) : 
        pass 
assert (x == [0]) 

    
    

    Fix the buggy line: with _wait_signal (qtbot.timeout) :
assistant
#Here is Python program to fix the buggy line: with _wait_signal (qtbot.

with _wait_signal (timer.timeout) :