human
Solve the following python programming problem given the following code:
def test_open_before_input(self) : 
    '[Regression] Test that if an open filter is used, input filters
        still receive the ``source_path`` kwargs.
        ' 
    captured_kw = { 
        
} 
    class TestFilter (Filter) : 
        def open(self, out, * a, **kw) : 
            out.write ('foo') 
def input(self, * a, **kw) : 
            assert (not captured_kw) 
            captured_kw.update (kw) 
self.create_files ({ 
        'a' : '1', 
}) 
    self.mkbundle ('a', filters = TestFilter, output = 'out').build () 
    assert ('source_path' in self) 

    
    

    Fix the buggy line: assert ('source_path' in self)
assistant
#Here is Python code to fix the buggy line: assert ('source_path' in self)
.

assert ('source_path' in captured_kw)