def test_max_no_bits():
sdm = SparseDM(3)
assert sdm.max_bits_in_full_dm == 0
sdm.ensure_dense(0)
assert sdm.max_bits_in_full_dm == 1
sdm.ensure_dense(1)
assert sdm.max_bits_in_full_dm == 2
sdm.ensure_dense(2)
assert sdm.max_bits_in_full_dm == 3
sdm.ensure_classical(0)
assert sdm.max_bits_in_full_dm == 3
sdm.ensure_classical(1)
assert sdm.max_bits_in_full_dm == 3
sdm.ensure_classical(2)
assert sdm.max_bits_in_full_dm == 3
assert len(sdm.classical) == 3
assert sdm.full_dm.no_qubits == 0
def test_ensure_classical_fail_after_hadamard():
sdm = SparseDM(10)
sdm.hadamard(0)
with pytest.raises(ValueError):
sdm.ensure_classical(0)
def test_ensure_classical_no_operation():
sdm = SparseDM(10)
sdm.ensure_dense(0)
sdm.ensure_classical(0)
def test_ensure_classical_simple():
sdm = SparseDM(10)
sdm.ensure_classical(0)
