}

  /**
   * Tests that the ImmutableGraph.Builder doesn't change when the creating GraphBuilder changes.
   */
  @Test
  @SuppressWarnings("CheckReturnValue")
  public void immutableGraphBuilder_copiesGraphBuilder() {
    GraphBuilder<String> graphBuilder =
        GraphBuilder.directed()
            .allowsSelfLoops(true)
            .<String>nodeOrder(ElementOrder.<String>natural());