def test_basic_qubit_hash():
fake_engine = "Fake"
a = _qubit.BasicQubit(fake_engine, 1)
b = _qubit.BasicQubit(fake_engine, 1)
c = _qubit.WeakQubitRef(fake_engine, 1)
assert a == b and hash(a) == hash(b)
assert a == c and hash(a) == hash(c)
# For performance reasons, low ids should not collide.
assert len({hash(_qubit.BasicQubit(fake_engine, e))
for e in range(100)}) == 100
# Important that weakref.WeakSet in projectq.cengines._main.py works.
# When id is -1, expect reference equality.
x = _qubit.BasicQubit(fake_engine, -1)
y = _qubit.BasicQubit(fake_engine, -1)
# Note hash(x) == hash(y) isn't technically a failure, but it's surprising.
assert x != y and hash(x) != hash(y)
def test_weak_qubit_ref():
# Test that there is no deallocate gate
qubit = _qubit.WeakQubitRef("Engine without deallocate_qubit()", 0)
with pytest.raises(AttributeError):
qubit.__del__()