def test_register_valid_class(self):
"""Test backend registration for a custom valid backend."""
backend_name = register_backend(ValidBackend)
# Check that it has been added to the list of backends.
self.assertIn(backend_name, _REGISTERED_BACKENDS.keys())
self.assertEqual(_REGISTERED_BACKENDS[backend_name].cls, ValidBackend)
# Second registration should fail as it is already registered.
with self.assertRaises(QISKitError):
register_backend(ValidBackend)
def test_register_valid_class(self):
"""Test backend registration for a custom valid backend."""
backend_name = register_backend(ValidBackend)
# Check that it has been added to the list of backends.
self.assertIn(backend_name, _REGISTERED_BACKENDS.keys())
self.assertEqual(_REGISTERED_BACKENDS[backend_name].cls, ValidBackend)
# Second registration should fail as it is already registered.
with self.assertRaises(QISKitError):
register_backend(ValidBackend)
def test_register_invalid_class(self):
"""Test backend registration for invalid backends."""
initial_backends_len = len(_REGISTERED_BACKENDS)
for backend_cls in [
NotSubclassBackend, NoConfigurationBackend,
UninstantiableBackend
]:
with self.subTest(backend_cls=backend_cls):
with self.assertRaises(QISKitError):
register_backend(backend_cls)
self.assertEqual(initial_backends_len, len(_REGISTERED_BACKENDS))
def test_register_invalid_class(self):
"""Test backend registration for invalid backends."""
initial_backends_len = len(_REGISTERED_BACKENDS)
with self.assertRaises(QISKitError):
register_backend(NotSubclassBackend)
with self.assertRaises(QISKitError):
register_backend(NoConfigurationBackend)
with self.assertRaises(QISKitError):
register_backend(UninstantiableBackend)
self.assertEqual(initial_backends_len, len(_REGISTERED_BACKENDS))