*/
  public void testAddAtIndex_unsupportedPresent() {
    assertThrows(UnsupportedOperationException.class, () -> getList().add(0, e0()));
    expectUnchanged();
  }

  @ListFeature.Require(SUPPORTS_ADD_WITH_INDEX)
  public void testAddAtIndex_supportedNotPresent() {
    getList().add(0, e3());
    expectAdded(0, e3());
  }

  @CollectionFeature.Require(FAILS_FAST_ON_CONCURRENT_MODIFICATION)

    int index = aValidIndex();
    E initialValue = getList().get(index);
    assertEquals(
        "set(i, x) should return the old element at position i.",
        initialValue,
        getList().set(index, newValue));
    assertEquals("After set(i, x), get(i) should return x", newValue, getList().get(index));
    assertEquals("set() should not change the size of a list.", getNumElements(), getList().size());
  }

    assertEquals("::1", HostAndPort.fromString("[::1]:80").requireBracketsForIPv6().getHost());
    // Non-bracketed non-IPv6 works fine.
    assertEquals("x", HostAndPort.fromString("x").requireBracketsForIPv6().getHost());
    assertEquals("x", HostAndPort.fromString("x:80").requireBracketsForIPv6().getHost());

    // Non-bracketed IPv6 fails.
    assertThrows(

    assertEquals("::1", HostAndPort.fromString("[::1]:80").requireBracketsForIPv6().getHost());
    // Non-bracketed non-IPv6 works fine.
    assertEquals("x", HostAndPort.fromString("x").requireBracketsForIPv6().getHost());
    assertEquals("x", HostAndPort.fromString("x:80").requireBracketsForIPv6().getHost());

    // Non-bracketed IPv6 fails.
    assertThrows(

  public void testRemoveAtIndex_unsupported() {
    assertThrows(UnsupportedOperationException.class, () -> getList().remove(0));
    expectUnchanged();
  }

  @ListFeature.Require(SUPPORTS_REMOVE_WITH_INDEX)
  public void testRemoveAtIndex_negative() {
    assertThrows(IndexOutOfBoundsException.class, () -> getList().remove(-1));
    expectUnchanged();
  }

  @ListFeature.Require(SUPPORTS_REMOVE_WITH_INDEX)

  public void testSubList_startNegative() {
    assertThrows(IndexOutOfBoundsException.class, () -> getList().subList(-1, 0));
  }

  public void testSubList_endTooLarge() {
    assertThrows(IndexOutOfBoundsException.class, () -> getList().subList(0, getNumElements() + 1));
  }

  public void testSubList_startGreaterThanEnd() {
    try {
      getList().subList(1, 0);
      fail("subList(1, 0) should throw");

  public void testSubList_startNegative() {
    assertThrows(IndexOutOfBoundsException.class, () -> getList().subList(-1, 0));
  }

  public void testSubList_endTooLarge() {
    assertThrows(IndexOutOfBoundsException.class, () -> getList().subList(0, getNumElements() + 1));
  }

  public void testSubList_startGreaterThanEnd() {
    try {
      getList().subList(1, 0);
      fail("subList(1, 0) should throw");

   */
  public void testAddAtIndex_unsupportedPresent() {
    assertThrows(UnsupportedOperationException.class, () -> getList().add(0, e0()));
    expectUnchanged();
  }

  @ListFeature.Require(SUPPORTS_ADD_WITH_INDEX)
  public void testAddAtIndex_supportedNotPresent() {
    getList().add(0, e3());
    expectAdded(0, e3());
  }

  @CollectionFeature.Require(FAILS_FAST_ON_CONCURRENT_MODIFICATION)

            assertNotNull(context);
            assertArrayEquals(hashAlgos, context.getHashAlgos());
            assertArrayEquals(salt, context.getSalt());
            assertEquals(0, context.getHashAlgos().length);
            assertEquals(0, context.getSalt().length);
        }

        @Test
        @DisplayName("Should create instance with default constructor")
        void testDefaultConstructor() {

    int index = aValidIndex();
    E initialValue = getList().get(index);
    assertEquals(
        "set(i, x) should return the old element at position i.",
        initialValue,
        getList().set(index, newValue));
    assertEquals("After set(i, x), get(i) should return x", newValue, getList().get(index));
    assertEquals("set() should not change the size of a list.", getNumElements(), getList().size());
  }