def test_gell_mann_idx_3(self):
"""Gell-Mann operator for index = 3."""
expected_res = np.array([[1, 0, 0], [0, -1, 0], [0, 0, 0]])
res = gell_mann(3)
bool_mat = np.isclose(expected_res, res)
self.assertEqual(np.all(bool_mat), True)
def test_gell_mann_sparse(self):
"""Test sparse Gell-Mann matrix."""
res = gell_mann(3, is_sparse=True)
self.assertEqual(isinstance(res, csr_matrix), True)
def test_invalid_idx(self):
"""Invalid Gell-Mann parameters."""
with self.assertRaises(ValueError):
gell_mann(9)