How to use the dagit.app.create_app function in dagit

def load_dagit_for_repo_cli_args(n_pipelines=1, **kwargs):
    handle = handle_for_repo_cli_args(kwargs)

    app = create_app(handle, DagsterInstance.ephemeral())

    client = app.test_client()

    res = client.get('/graphql?query={query_string}'.format(query_string=PIPELINES_OR_ERROR_QUERY))
    json_res = json.loads(res.data.decode('utf-8'))
    assert 'data' in json_res
    assert 'pipelinesOrError' in json_res['data']
    assert 'nodes' in json_res['data']['pipelinesOrError']
    assert len(json_res['data']['pipelinesOrError']['nodes']) == n_pipelines

    return res

def load_dagit_for_repo_cli_args(n_pipelines=1, **kwargs):
    handle = handle_for_repo_cli_args(kwargs)

    app = create_app(handle, DagsterInstance.ephemeral())

    client = app.test_client()

    res = client.get('/graphql?query={query_string}'.format(query_string=PIPELINES_OR_ERROR_QUERY))
    json_res = json.loads(res.data.decode('utf-8'))
    assert 'data' in json_res
    assert 'pipelinesOrError' in json_res['data']
    assert 'nodes' in json_res['data']['pipelinesOrError']
    assert len(json_res['data']['pipelinesOrError']['nodes']) == n_pipelines

    return res

def test_notebook_view():
    notebook_path = script_relative_path('render_uuid_notebook.ipynb')

    with create_app(
        ExecutionTargetHandle.for_repo_yaml(script_relative_path('./repository.yaml')),
        DagsterInstance.ephemeral(),
    ).test_client() as client:
        res = client.get('/dagit/notebook?path={}'.format(notebook_path))

    assert res.status_code == 200
    # This magic guid is hardcoded in the notebook
    assert b'6cac0c38-2c97-49ca-887c-4ac43f141213' in res.data