def test_copy_empty(backend):
c = Circuit()
c.run(backend=backend)
cc = c.copy(copy_backends=True)
assert c.ops == cc.ops and c.ops is not cc.ops
if backend in ['numpy', 'numba']:
assert c._backends[backend].cache is None and cc._backends[backend].cache is None
assert c._backends[backend].cache_idx == cc._backends[backend].cache_idx == -1
def test_copy_empty_numba():
c = Circuit()
c.run(backend='numba')
# copy_history: deprecated.
cc = c.copy(copy_backends=True)
assert c.ops == cc.ops and c.ops is not cc.ops
assert c._backends['numba'].cache is None and cc._backends[
'numba'].cache is None
assert c._backends['numba'].cache_idx == cc._backends[
'numba'].cache_idx == -1
