def METHOD_NAME(precalculated_xgb_multiclass_explainer, test_names):
    fig = precalculated_xgb_multiclass_explainer.plot_trees(index=0)
    assert isinstance(fig, go.Figure)
    fig = precalculated_xgb_multiclass_explainer.plot_trees(index=test_names[0])
    assert isinstance(fig, go.Figure)
    fig = precalculated_xgb_multiclass_explainer.plot_trees(index=test_names[0], highlight_tree=0)
    assert isinstance(fig, go.Figure)
    fig = precalculated_xgb_multiclass_explainer.plot_trees(index=test_names[0], pos_label=0)
    assert isinstance(fig, go.Figure)