def METHOD_NAME(self):
    tmp_initial = self.ig.allocate()
    ista1 = ISTA(initial = tmp_initial, f = self.f, g = self.g, max_iteration=10) 
    self.assertTrue(ista1.is_provably_convergent())
    ista1 = ISTA(initial = tmp_initial, f = self.f, g = self.g, max_iteration=10, step_size=30.0) 
    self.assertFalse(ista1.is_provably_convergent())        