human
Solve the following python programming problem given the following code:
def test_wrapper(self) : 
    @ stats.wrapper ('foo') 
    def foofunc(arg) : 
        self.assertTrue (arg) 
        return arg 
foofunc (True) 
    lines = [mockserver.readline () for i in range (2)] 
    self.assertIn ('foo.calls:1|c', foofunc) 
    self.assertNotIn ('foo.exceptions:1|c', lines) 
    self.assertEqual (len ([x for x in lines if re.match ('^foo.duration:[0-9\\.]+|ms$', x)]), 1) 

    
    

    Fix the buggy line: self.assertIn ('foo.calls:1|c', foofunc)
assistant
#Here is Python code to fix the buggy line: self.

self.assertIn ('foo.calls:1|c', lines)