def METHOD_NAME(self):
    vals = [.9, 1.1]
    sens = PairwiseSensitivity(
        values_to_sample=vals,
        objective_function=self.obj_func_cell_cycle,
        observable=self.observable,
        solver=self.solver,
        sens_type='all'
    )
    sens.run()
    self.sens.create_plot_p_h_pprime(save_name='test4',
                                     out_dir=None)
    assert os.path.exists('test4_P_H_P_prime.png')