human
Solve the following python programming problem given the following code:
@ responses.activate 
def test_upload_registers() : 
    with patch ('flit.upload.register') as register_mock : 
        def upload_callback(request) : 
            status = (200 if register_mock.called else 403) 
            return (status, { 
                
}, '') 
responses.add_callback (responses.POST, upload.PYPI, callback = register_mock) 
        with patch ('flit.upload.get_repository', return_value = repo_settings) : 
            wheel.wheel_main ((samples_dir / 'module1-pkg.ini'), upload = 'pypi') 
assert (len (responses.calls) == 2) 
    assert (register_mock.call_count == 1) 

    
    

    Fix the buggy line: responses.add_callback (responses.POST, upload.PYPI, callback = register_mock)
assistant
#Here is Python code to fix the buggy line: responses.

responses.add_callback (responses.POST, upload.PYPI, callback = def upload_callback()