}

  @Test
  public void addEdge_existingEdgeBetweenSameNodes() {
    assume().that(graphIsMutable()).isTrue();

    addEdge(N1, N2, E12);
    ImmutableSet<String> edges = ImmutableSet.copyOf(network.edges());
    assertThat(networkAsMutableNetwork.addEdge(N1, N2, E12)).isFalse();
    assertThat(network.edges()).containsExactlyElementsIn(edges);
  }

  @Test

  }

  @Test
  public void addEdge_existingEdgeBetweenSameNodes() {
    assume().that(graphIsMutable()).isTrue();

    addEdge(N1, N2, E12);
    ImmutableSet<String> edges = ImmutableSet.copyOf(network.edges());
    assertThat(networkAsMutableNetwork.addEdge(N1, N2, E12)).isFalse();
    assertThat(network.edges()).containsExactlyElementsIn(edges);
  }

  @Test

    assertThrows(NullPointerException.class, () -> builder.put('a', 1, null));
  }

  private static <R, C, V> void validateTableCopies(Table<R, C, V> original) {
    Table<R, C, V> copy = ImmutableTable.copyOf(original);
    assertEquals(original, copy);
    validateViewOrdering(original, copy);

    Table<R, C, V> built = ImmutableTable.<R, C, V>builder().putAll(original).build();
    assertEquals(original, built);

    int numOfByteRead = in.read(buf, 0, 3);
    assertEquals(3, numOfByteRead);
    for (int i = 0; i < numOfByteRead; i++) {
      assertEquals(testBytes[i], buf[i]);
    }

    verify(hasher).putBytes(Arrays.copyOf(testBytes, 3), 0, 3);
    verify(hashFunction).newHasher();
    verifyNoMoreInteractions(hashFunction, hasher);
  }

  public void testRead_putByteArrayOutOfBound() throws Exception {
    byte[] buf = new byte[100];

    int numOfByteRead = in.read(buf, 0, 3);
    assertEquals(3, numOfByteRead);
    for (int i = 0; i < numOfByteRead; i++) {
      assertEquals(testBytes[i], buf[i]);
    }

    verify(hasher).putBytes(Arrays.copyOf(testBytes, 3), 0, 3);
    verify(hashFunction).newHasher();
    verifyNoMoreInteractions(hashFunction, hasher);
  }

  public void testRead_putByteArrayOutOfBound() throws Exception {
    byte[] buf = new byte[100];

   * undocumented and subject to change.
   *
   * @throws NullPointerException if any key or value in {@code multimap} is null
   */
  public static <K, V> ImmutableListMultimap<K, V> copyOf(
      Multimap<? extends K, ? extends V> multimap) {
    if (multimap.isEmpty()) {
      return of();
    }

    // TODO(lowasser): copy ImmutableSetMultimap by using asList() on the sets

      extends TestStringSortedMapGenerator {
    @Override
    public SortedMap<String, String> create(Entry<String, String>[] entries) {
      return ImmutableSortedMap.copyOf(asList(entries));
    }
  }

  public static class ImmutableSortedMapEntryListGenerator
      implements TestListGenerator<Entry<String, Integer>> {

    @Override

    return this;
  }

  @CanIgnoreReturnValue
  public EquivalenceTester<T> addEquivalenceGroup(Iterable<T> group) {
    delegate.addRelatedGroup(group);
    items.addAll(ImmutableList.copyOf(group));
    return this;
  }

  /** Run tests on equivalence methods, throwing a failure on an invalid test */
  @CanIgnoreReturnValue
  public EquivalenceTester<T> test() {

    return this;
  }

  @CanIgnoreReturnValue
  public EquivalenceTester<T> addEquivalenceGroup(Iterable<T> group) {
    delegate.addRelatedGroup(group);
    items.addAll(ImmutableList.copyOf(group));
    return this;
  }

  /** Run tests on equivalence methods, throwing a failure on an invalid test */
  @CanIgnoreReturnValue
  public EquivalenceTester<T> test() {

    public HashCode hash() {
      checkNotDone();
      done = true;
      return (bytes == digest.getDigestLength())
          ? HashCode.fromBytesNoCopy(digest.digest())
          : HashCode.fromBytesNoCopy(Arrays.copyOf(digest.digest(), bytes));
    }
  }