assertThat(network.nodes()).containsExactly(N1, N5, N4, N2, N3);
    assertThat(network.edges()).containsExactly(E15, E41, E23);
    assertThat(network.edgesConnecting(N1, N5)).containsExactly(E15);
    assertThat(network.edgesConnecting(N4, N1)).containsExactly(E41);
    assertThat(network.edgesConnecting(N2, N3)).containsExactly(E23);
    // Direction of the added edge is correctly handled

    assertThat(set.headSet(2)).containsExactly(1).inOrder();
    assertThat(set.headSet(3)).containsExactly(1, 2).inOrder();
    assertThat(set.headSet(4)).containsExactly(1, 2, 3).inOrder();
    assertThat(set.headSet(Integer.MAX_VALUE)).containsExactly(1, 2, 3).inOrder();
    assertThat(set.headSet(1, true)).containsExactly(1).inOrder();
    assertThat(set.headSet(2, true)).containsExactly(1, 2).inOrder();

    assertThat(graph.nodes()).containsExactly(3, 1, 4).inOrder();
  }

  // The default ordering is INSERTION unless otherwise specified.
  @Test
  public void nodeOrder_default() {
    MutableGraph<Integer> graph = GraphBuilder.directed().build();

    addNodes(graph);

    assertThat(graph.nodeOrder()).isEqualTo(insertion());
    assertThat(graph.nodes()).containsExactly(3, 1, 4).inOrder();
  }

  @Test

    assertThat(Files.fileTraverser().breadthFirst(rootDir)).containsExactly(rootDir);
  }

  public void testFileTraverser_nonExistingFile() throws Exception {
    File file = new File(rootDir, "file-that-doesnt-exist");

    assertThat(Files.fileTraverser().breadthFirst(file)).containsExactly(file);
  }

  public void testFileTraverser_file() throws Exception {

      assertThat(headersToList(builder)).containsExactly("Content-Length: 0")
    }
  }

  @Test
  fun setStatusControlsWholeStatusLine() {
    val builder = MockResponse.Builder().status("HTTP/1.1 202 That'll do pig")
    assertThat(headersToList(builder)).containsExactly("Content-Length: 0")
    assertThat(builder.status).isEqualTo("HTTP/1.1 202 That'll do pig")
  }

        .containsExactly(1, SIXTEEN_SQUARES_QUARTILE_1, 3, SIXTEEN_SQUARES_QUARTILE_3);
  }

  public void testQuartiles_indexes_varargs_computeInPlace() {
    double[] dataset = Doubles.toArray(SIXTEEN_SQUARES_DOUBLES);
    assertThat(quartiles().indexes(1, 3).computeInPlace(dataset))
        .comparingValuesUsing(QUANTILE_CORRESPONDENCE)
        .containsExactly(
            1, SIXTEEN_SQUARES_QUARTILE_1,

        .containsExactly(1, SIXTEEN_SQUARES_QUARTILE_1, 3, SIXTEEN_SQUARES_QUARTILE_3);
  }

  public void testQuartiles_indexes_varargs_computeInPlace() {
    double[] dataset = Doubles.toArray(SIXTEEN_SQUARES_DOUBLES);
    assertThat(quartiles().indexes(1, 3).computeInPlace(dataset))
        .comparingValuesUsing(QUANTILE_CORRESPONDENCE)
        .containsExactly(
            1, SIXTEEN_SQUARES_QUARTILE_1,

  }

  public void testOf1() {
    assertThat(ImmutableLongArray.of(0).asList()).containsExactly(0L);
  }

  public void testOf2() {
    assertThat(ImmutableLongArray.of(0, 1).asList()).containsExactly(0L, 1L).inOrder();
  }

  public void testOf3() {
    assertThat(ImmutableLongArray.of(0, 1, 3).asList()).containsExactly(0L, 1L, 3L).inOrder();
  }

  public void testOf4() {

    assertThat(network.edgesConnecting(N1, N1)).containsExactly(E11);
    assertThat(network.edgesConnecting(N1, N2)).containsExactly(E12);
    assertTrue(networkAsMutableNetwork.removeEdge(E11));
    assertThat(network.edgesConnecting(N1, N1)).isEmpty();
    assertThat(network.edgesConnecting(N1, N2)).containsExactly(E12);
  }

  @Test
  public void concurrentIteration() throws Exception {

            .<String, Integer>immutable()
            .putEdgeValue("A", "B", 10)
            .build();

    assertThat(graph.nodes()).containsExactly("A", "B");
    assertThat(graph.edges()).containsExactly(EndpointPair.ordered("A", "B"));
    assertThat(graph.edgeValueOrDefault("A", "B", null)).isEqualTo(10);
  }

  @Test
  public void immutableValueGraphBuilder_putEdgeFromEndpointPair() {