def METHOD_NAME(self):
    # Tests hyperparameter methods
    mcmc = pints.HaarioACMC(self.real_parameters)
    self.assertTrue(mcmc.n_hyper_parameters(), 1)
    mcmc.set_hyper_parameters([0.1])
    self.assertEqual(mcmc.eta(), 0.1)
    mcmc.set_hyper_parameters([0.67])
    self.assertEqual(mcmc.eta(), 0.67)