def METHOD_NAME(self):
    """
    Testing methods in the solverwriter factory registration process
    """
    SolverFactory.unregister('stest3')
    self.assertTrue('stest3' not in SolverFactory)
    SolverFactory.register('stest3')(MockSolver)
    self.assertTrue('stest3' in SolverFactory)
    self.assertTrue('_mock_cbc' in SolverFactory)