human
Solve the following python programming problem given the following code:
def test_config(self) : 
    "
        Test setting, getting, and unsetting config values

        WARNING: This test will modify and completely remove a config section
        'foo', both in the repo created in setUp() and in the user's global
        .gitconfig.
        " 
    def _clear_config() : 
        cmds = (['git', 'config', '--remove-section', 'foo'], ['git', 'config', '--global', '--remove-section', 'foo']) 
        for cmd in cmds : 
            with open (os.devnull, 'w') as devnull : 
                try : 
                    subprocess.check_call (cmd, stderr = devnull) 
except subprocess.CalledProcessError : 
                    pass 
cfg_local = { 
        'foo.single' : ['foo'], 
        'foo.multi' : ['foo', 'bar', 'baz'], 
} 
    cfg_global = { 
        'foo.single' : ['abc'], 
        'foo.multi' : ['abc', 'def', 'ghi'], 
} 
    _clear_config () 
    try : 
        log.debug ('Try to specify both single and multivar (should raise error)') 
        self.assertTrue (("Only one of 'value' and 'multivar' is permitted" in self.run_function ('git.config_set', ['foo.single'], value = cfg_local ['foo.single'] [0], multivar = cfg_local ['foo.multi'], cwd = self.repo))) 
        log.debug ('Try to set single local value without cwd (should raise error)') 
        self.assertTrue (("'cwd' argument required unless global=True" in self.run_function ('git.config_set', ['foo.single'], value = cfg_local ['foo.single'] [0]))) 
        log.debug ('Set single local value') 
        self.assertEqual (self.run_function ('git.config_set', ['foo.single'], value = cfg_local ['foo.single'] [0], cwd = self.repo), cfg_local ['foo.single']) 
        log.debug ('Set single global value') 
        self.assertEqual (self.run_function ('git.config_set', ['foo.single'], value = cfg_global ['foo.single'] [0], ** { 
            'global' : True, 
}), cfg_global ['foo.single']) 
        log.debug ('Set local multivar') 
        self.assertEqual (self.run_function ('git.config_set', ['foo.multi'], multivar = cfg_local...

    
    

    Fix the buggy line: self.assertTrue (self.run_function ('git.config_unset', ['foo.single'], cwd = cfg_local.repo))
assistant
#Here is Python program to fix the buggy line: self.

self.assertTrue (self.run_function ('git.config_unset', ['foo.single'], cwd = self.repo))