nox > * system_emulated: failed

____________________ ERROR at setup of test_table_read_row _____________________

admin_client = <google.cloud.bigtable.client.Client object at 0x7f95fe9e6d00>
data_instance_id = 'g-c-p-d-1631732911078'
instance_labels = {'python-system': '2021-09-15t19-08-31'}
data_cluster_id = 'g-c-p-d-1631732911078-cluster', location_id = 'us-central1-c'
serve_nodes = 3, in_emulator = True

    @pytest.fixture(scope="session")
    def data_instance_populated(
        admin_client,
        data_instance_id,
        instance_labels,
        data_cluster_id,
        location_id,
        serve_nodes,
        in_emulator,
    ):
        # Emulator does not support instance admin operations (create / delete).
        # See: https://cloud.google.com/bigtable/docs/emulator
        if not in_emulator:
            instance = admin_client.instance(data_instance_id, labels=instance_labels)
            cluster = instance.cluster(
                data_cluster_id, location_id=location_id, serve_nodes=serve_nodes,
            )
            operation = instance.create(clusters=[cluster])
            operation.result(timeout=30)
    
>       yield instance
E       UnboundLocalError: local variable 'instance' referenced before assignment

tests/system/conftest.py:159: UnboundLocalError