def test_dagger_raises_only_single_error():
eng = MainEngine(backend=DummyEngine(), engine_list=[])
# Tests that QubitManagementError is not sent in addition
with pytest.raises(RuntimeError):
with _dagger.Dagger(eng):
ancilla = eng.allocate_qubit() # noqa: F841
raise RuntimeError
def test_dagger_with_dirty_qubits():
backend = DummyEngine(save_commands=True)
def allow_dirty_qubits(self, meta_tag):
return meta_tag == DirtyQubitTag
backend.is_meta_tag_handler = types.MethodType(allow_dirty_qubits, backend)
eng = MainEngine(backend=backend, engine_list=[DummyEngine()])
qubit = eng.allocate_qubit()
with _dagger.Dagger(eng):
ancilla = eng.allocate_qubit(dirty=True)
Rx(0.6) | ancilla
CNOT | (ancilla, qubit)
H | qubit
Rx(-0.6) | ancilla
del ancilla[0]
eng.flush(deallocate_qubits=True)
assert len(backend.received_commands) == 9
assert backend.received_commands[0].gate == Allocate
assert backend.received_commands[1].gate == Allocate
assert backend.received_commands[2].gate == Rx(0.6)
assert backend.received_commands[3].gate == H
assert backend.received_commands[4].gate == X
assert backend.received_commands[5].gate == Rx(-0.6)
assert backend.received_commands[6].gate == Deallocate
assert backend.received_commands[7].gate == Deallocate
assert backend.received_commands[1].tags == [DirtyQubitTag()]
assert backend.received_commands[6].tags == [DirtyQubitTag()]
def test_dagger_qubit_management_error():
eng = MainEngine(backend=DummyEngine(), engine_list=[DummyEngine()])
with pytest.raises(_dagger.QubitManagementError):
with _dagger.Dagger(eng):
ancilla = eng.allocate_qubit() # noqa: F841