}

  // Not specifying KNOWN_ORDER for PriorityQueue and PriorityBlockingQueue
  // even though they do have it, because our tests interpret KNOWN_ORDER to
  // also mean that the iterator returns the head element first, which those
  // don't.

  public Test testsForPriorityBlockingQueue() {
    return QueueTestSuiteBuilder.using(
            new TestStringQueueGenerator() {
              @Override

     */
    protected abstract List<Float> create(Float[] elements);

    @Override
    public Float[] createArray(int length) {
      return new Float[length];
    }

    /** Returns the original element list, unchanged. */
    @Override
    public List<Float> order(List<Float> insertionOrder) {
      return insertionOrder;
    }
  }

  public static class SampleFloats extends SampleElements<Float> {

     */
    protected abstract List<Float> create(Float[] elements);

    @Override
    public Float[] createArray(int length) {
      return new Float[length];
    }

    /** Returns the original element list, unchanged. */
    @Override
    public List<Float> order(List<Float> insertionOrder) {
      return insertionOrder;
    }
  }

  public static class SampleFloats extends SampleElements<Float> {

     */
    protected abstract List<Integer> create(Integer[] elements);

    @Override
    public Integer[] createArray(int length) {
      return new Integer[length];
    }

    /** Returns the original element list, unchanged. */
    @Override
    public List<Integer> order(List<Integer> insertionOrder) {
      return insertionOrder;
    }
  }

  public static class SampleIntegers extends SampleElements<Integer> {

    public boolean contains(@Nullable Object element) {
      return multimap.containsKey(element);
    }

    @Override
    public Iterator<K> iterator() {
      return Maps.keyIterator(multimap.entries().iterator());
    }

    @Override
    public int count(@Nullable Object element) {
      Collection<V> values = Maps.safeGet(multimap.asMap(), element);
      return (values == null) ? 0 : values.size();

    public boolean contains(@Nullable Object element) {
      return multimap.containsKey(element);
    }

    @Override
    public Iterator<K> iterator() {
      return Maps.keyIterator(multimap.entries().iterator());
    }

    @Override
    public int count(@Nullable Object element) {
      Collection<V> values = Maps.safeGet(multimap.asMap(), element);
      return (values == null) ? 0 : values.size();

  /**
   * Sets {@code table[index]} to {@code entry}, where {@code table} is actually a {@code byte[]},
   * {@code short[]}, or {@code int[]}. The value of {@code entry} should fit in the size of the
   * assigned array element, when seen as an unsigned value. So if {@code table} is a {@code byte[]}
   * then we should have {@code 0 ≤ entry ≤ 255}, and if {@code table} is a {@code short[]} then we

    }

    /**
     * Concatenates elements of a class name.
     *
     * @param s1
     *            The first element of the class name
     * @param s2
     *            The second element of the class name
     * @return The concatenated name
     */
    public static String concatName(final String s1, final String s2) {

    IllegalArgumentException expected =
        assertThrows(IllegalArgumentException.class, () -> getOnlyElement(iterator));
    assertThat(expected).hasMessageThat().isEqualTo("expected one element but was: <one, two>");
  }

  public void testGetOnlyElement_noDefault_fiveElements() {
    Iterator<String> iterator = asList("one", "two", "three", "four", "five").iterator();
    IllegalArgumentException expected =

    List<E> containsNull = singletonList(null);
    assertTrue("addAll(containsNull) should return true", collection.addAll(containsNull));
    /*
     * We need (E) to force interpretation of null as the single element of a
     * varargs array, not the array itself
     */
    expectAdded((E) null);
  }

  @CollectionFeature.Require(value = SUPPORTS_ADD, absent = ALLOWS_NULL_VALUES)