def METHOD_NAME(self, callback_url, expected_header, expected_body):
    """
    Verify that the stub sent a POST request back to us
    with the expected data.
    `callback_url` is the URL we expect the stub to POST to
    `expected_header` is the header (a string) we expect to receive with the grade.
    `expected_body` is the content (a string) we expect to receive with the grade.
    Raises an `AssertionError` if the check fails.
    """
    # Check the response posted back to us
    # This is the default response
    expected_callback_dict = {
        'xqueue_header': expected_header,
        'xqueue_body': expected_body,
    }
    # Check that the POST request was made with the correct params
    assert self.post.call_args[1]['data']['xqueue_body'] == expected_callback_dict['xqueue_body']
    assert ast.literal_eval(self.post.call_args[1]['data']['xqueue_header']) ==\
           ast.literal_eval(expected_callback_dict['xqueue_header'])
    assert self.post.call_args[0][0] == callback_url