def METHOD_NAME(self):
    for func in self.pivoted_cholesky:
        A = numpy.array([[9.0]])
        L, piv, rank = func(A)
        self.assertEqual(L.shape, (1, 1))
        self.assertEqual(piv.shape, (1,))
        self.assertAlmostEqual(L[0, 0], 3.0, delta=1.0e-14)
        self.assertEqual(piv[0], 0)
        self.assertEqual(rank, 1)