def test_command_printer_no_input_default_measure():
cmd_printer = _printer.CommandPrinter(accept_input=False)
eng = MainEngine(backend=cmd_printer, engine_list=[DummyEngine()])
qubit = eng.allocate_qubit()
NOT | qubit
Measure | qubit
assert int(qubit) == 0
def test_command_printer_is_available():
inline_cmd_printer = _printer.CommandPrinter()
cmd_printer = _printer.CommandPrinter()
def available_cmd(self, cmd):
return cmd.gate == H
filter = InstructionFilter(available_cmd)
eng = MainEngine(backend=cmd_printer, engine_list=[inline_cmd_printer, filter])
qubit = eng.allocate_qubit()
cmd0 = Command(eng, H, (qubit,))
cmd1 = Command(eng, T, (qubit,))
assert inline_cmd_printer.is_available(cmd0)
assert not inline_cmd_printer.is_available(cmd1)
assert cmd_printer.is_available(cmd0)
assert cmd_printer.is_available(cmd1)
def test_command_printer_measure_no_control():
qb1 = WeakQubitRef(engine=None, idx=1)
qb2 = WeakQubitRef(engine=None, idx=2)
printer = _printer.CommandPrinter()
printer.is_last_engine = True
with pytest.raises(ValueError):
printer._print_cmd(Command(engine=None, gate=Measure, qubits=([qb1],), controls=[qb2]))
def test_command_printer_accept_input(monkeypatch):
cmd_printer = _printer.CommandPrinter()
eng = MainEngine(backend=cmd_printer, engine_list=[DummyEngine()])
monkeypatch.setattr(_printer, "input", lambda x: 1)
qubit = eng.allocate_qubit()
Measure | qubit
assert int(qubit) == 1
monkeypatch.setattr(_printer, "input", lambda x: 0)
qubit = eng.allocate_qubit()
NOT | qubit
Measure | qubit
assert int(qubit) == 0
def test_command_printer_measure_mapped_qubit():
eng = MainEngine(_printer.CommandPrinter(accept_input=False), [])
qb1 = WeakQubitRef(engine=eng, idx=1)
qb2 = WeakQubitRef(engine=eng, idx=2)
cmd0 = Command(engine=eng, gate=Allocate, qubits=([qb1], ))
cmd1 = Command(engine=eng,
gate=Measure,
qubits=([qb1], ),
controls=[],
tags=[LogicalQubitIDTag(2)])
with pytest.raises(NotYetMeasuredError):
int(qb1)
with pytest.raises(NotYetMeasuredError):
int(qb2)
eng.send([cmd0, cmd1])
eng.flush()
with pytest.raises(NotYetMeasuredError):
int(qb1)
assert int(qb2) == 0