human
Solve the following python programming problem given the following code:
def test_signals(self) : 
    'Make sure the signals are fired.' 
    _signals_fired = [] 
    def _connect_sidebar(sender, **kwargs) : 
        _signals_fired.append ('sidebar') 
def _connect_header(sender, **kwargs) : 
        _signals_fired.append ('header') 
registry.connect ('sidebar_start', _connect_sidebar) 
    registry.connect ('header_end', _connect_header) 
    self.client.get ('/') 
    self.assertEquals (len (_connect_header), 2) 
    self.assertTrue (('sidebar' in _signals_fired)) 
    self.assertTrue (('header' in _signals_fired)) 

    
    

    Fix the buggy line: self.assertEquals (len (_connect_header), 2)
assistant
#Here is Python program to fix the buggy line: self.

self.assertEquals (len (_signals_fired), 2)