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test_basicaer_backends.py
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test_basicaer_backends.py
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# -*- coding: utf-8 -*-
# This code is part of Qiskit.
#
# (C) Copyright IBM 2017, 2018.
#
# This code is licensed under the Apache License, Version 2.0. You may
# obtain a copy of this license in the LICENSE.txt file in the root directory
# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
#
# Any modifications or derivative works of this code must retain this
# copyright notice, and modified files need to carry a notice indicating
# that they have been altered from the originals.
"""BasicAer Backends Test."""
from qiskit import BasicAer
from qiskit.providers.basicaer import BasicAerProvider
from qiskit.providers.exceptions import QiskitBackendNotFoundError
from qiskit.test import providers
class TestBasicAerBackends(providers.ProviderTestCase):
"""Qiskit BasicAer Backends (Object) Tests."""
provider_cls = BasicAerProvider
backend_name = 'qasm_simulator'
def test_deprecated(self):
"""Test that deprecated names map the same backends as the new names.
"""
def _get_first_available_backend(provider, backend_names):
"""Gets the first available backend."""
if isinstance(backend_names, str):
backend_names = [backend_names]
for backend_name in backend_names:
try:
return provider.get_backend(backend_name).name()
except QiskitBackendNotFoundError:
pass
return None
deprecated_names = BasicAer._deprecated_backend_names()
for oldname, newname in deprecated_names.items():
expected = "WARNING:qiskit.providers.providerutils:Backend '%s' is deprecated. " \
"Use '%s'." % (oldname, newname)
with self.subTest(oldname=oldname, newname=newname):
with self.assertLogs('qiskit.providers.providerutils', level='WARNING') as context:
resolved_newname = _get_first_available_backend(BasicAer, newname)
real_backend = BasicAer.get_backend(resolved_newname)
self.assertEqual(BasicAer.backends(oldname)[0], real_backend)
self.assertEqual(context.output, [expected])
def test_aliases_fail(self):
"""Test a failing backend lookup."""
self.assertRaises(QiskitBackendNotFoundError, BasicAer.get_backend, 'bad_name')
def test_aliases_return_empty_list(self):
"""Test backends() return an empty list if name is unknown."""
self.assertEqual(BasicAer.backends("bad_name"), [])