def METHOD_NAME(self):
    model = test_models_keras.simple_sequential_with_input_shape()
    # If input shape was given when creating Sequential model, there is layer connection information
    for layer in model.layers:
        assert layer.inbound_nodes
    connected_graph = ConnectedGraph(model)
    for layer in connected_graph._model.layers:
        assert layer.inbound_nodes
    assert len(connected_graph.get_all_ops().keys()) == 2