human
Solve the following python programming problem given the following code:
@ mock.patch ('os.path.isdir') 
def test_check_output_destination_bad(self, isdir) : 
    with mock.patch.object (builtins, 'open') as b_open : 
        isdir.return_value = False 
        b_open.side_effect = IOError () 
        def _b_tester(a, b) : 
            with b_utils.output_file (a, b) : 
                pass 
self.assertRaises (IOError, self, 'derp', 'r') 

    
    

    Fix the buggy line: self.assertRaises (IOError, self, 'derp', 'r')
assistant
#Here is Python program to fix the buggy line: self.

self.assertRaises (IOError, def _b_tester(, 'derp', 'r')