self = 
def test_w_service_unavailable_wrapped_in_grpc(self):
    from google.api_core.exceptions import ServiceUnavailable

    wrapped = ServiceUnavailable("testing")
    exception = self._make_grpc_call_error(wrapped)


  self.assertTrue(self._call_fut(exception))


tests/unit/test_row_data.py:317:

tests/unit/test_row_data.py:268: in _call_fut

return _retry_read_rows_exception(exc)

google/cloud/bigtable/row_data.py:333: in _retry_read_rows_exception

exc = exceptions.from_grpc_error(exc)

.nox/unit-3-10/lib/python3.10/site-packages/google/api_core/exceptions.py:537: in from_grpc_error

details=_parse_grpc_error_details(rpc_exc),

.nox/unit-3-10/lib/python3.10/site-packages/google/api_core/exceptions.py:490: in _parse_grpc_error_details

status = rpc_status.from_call(rpc_exc)

.nox/unit-3-10/lib/python3.10/site-packages/grpc_status/rpc_status.py:48: in from_call

if call.trailing_metadata() is None:

self = TestingException(ServiceUnavailable('testing'))
@abc.abstractmethod
def trailing_metadata(self):
    """Accesses the trailing metadata sent by the server.

    This method blocks until the value is available.

    Returns:
      The trailing :term:`metadata`.
    """


  raise NotImplementedError()


E       NotImplementedError
.nox/unit-3-10/lib/python3.10/site-packages/grpc/init.py:382: NotImplementedError