human
Solve the following python programming problem given the following code:
@ pytest.mark.parametrize ('dest_dir', [None, 'test_directory']) 
def test_cp_built_image_to_nfs(tmpdir, docker_tasker, dest_dir) : 
    mountpoint = tmpdir.join ('mountpoint') 
    def fake_check_call(cmd) : 
        assert (cmd == ['mount', '-t', 'nfs', '-o', 'nolock', NFS_SERVER_PATH, mountpoint]) 
flexmock (subprocess, check_call = fake_check_call) 
    workflow = DockerBuildWorkflow ({ 
        'provider' : 'git', 
        'uri' : 'asd', 
}, 'test-image') 
    workflow.builder = X () 
    workflow.exported_image_sequence.append ({ 
        'path' : os.path.join (str (tmpdir), EXPORTED_SQUASHED_IMAGE_NAME), 
}) 
    open (workflow.exported_image_sequence [(- 1)].get ('path'), 'a').close () 
    runner = PostBuildPluginsRunner (docker_tasker, workflow, [{ 
        'name' : CopyBuiltImageToNFSPlugin.key, 
        'args' : { 
            'nfs_server_path' : NFS_SERVER_PATH, 
            'dest_dir' : dest_dir, 
            'mountpoint' : str (mountpoint), 
}, 
}]) 
    runner.run () 
    if (tmpdir is None) : 
        assert os.path.isfile (os.path.join (str (mountpoint), EXPORTED_SQUASHED_IMAGE_NAME)) 
else : 
        assert os.path.isfile (os.path.join (str (mountpoint), dest_dir, EXPORTED_SQUASHED_IMAGE_NAME)) 

    
    

    Fix the buggy line: if (tmpdir is None) :
assistant
#Here is Python program to fix the buggy line: if (tmpdir is None) :
.

if (dest_dir is None) :