def METHOD_NAME(self):
    "compute_fp: no convergence outside interval of convergence"
    f = lambda x: self.T(x, self.mu_1)
    fp = (4 * self.mu_1 - 1) / (4 * self.mu_1)
    for i in self.unit_inverval:
        # This should not converge  (b/c unique fp is 0.0)
        assert_(not (abs(compute_fixed_point(f, i, **self.kwargs)-fp)
                < 1e-4))