multiset.addAll(adds);
    assertEquals(1, addCalls.get());
  }

  public void testRemoveUnsupported() {
    Multiset<String> multiset = new NoRemoveMultiset<>();
    multiset.add("a");
    assertThrows(UnsupportedOperationException.class, () -> multiset.remove("a"));
    assertTrue(multiset.contains("a"));
  }

  private static class NoRemoveMultiset<E extends @Nullable Object> extends AbstractMultiset<E>
      implements Serializable {

    super(true, true, false, false, false);
  }

  @Override
  protected String getKeyNotInPopulatedMap() {
    throw new UnsupportedOperationException();
  }

  @Override
  protected Map<String, Integer> makeEmptyMap() {
    throw new UnsupportedOperationException();
  }

  @Override
  Table<String, Character, Integer> makeTable() {

    super(true, true, false, false, false);
  }

  @Override
  protected String getKeyNotInPopulatedMap() {
    throw new UnsupportedOperationException();
  }

  @Override
  protected Map<String, Integer> makeEmptyMap() {
    throw new UnsupportedOperationException();
  }

  @Override
  protected Table<Character, String, Integer> makeTable() {

  }

  public void test_useForNull_skipNulls() {
    Joiner j = Joiner.on("x").useForNull("y");
    assertThrows(UnsupportedOperationException.class, j::skipNulls);
  }

  public void test_skipNulls_useForNull() {
    Joiner j = Joiner.on("x").skipNulls();
    assertThrows(UnsupportedOperationException.class, () -> j.useForNull("y"));
  }

  public void test_useForNull_twice() {

   * ContiguousSet}.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Use {@link #create}.
   */
  @Deprecated
  @DoNotCall("Always throws UnsupportedOperationException")
  public static <E> ImmutableSortedSet.Builder<E> builder() {
    throw new UnsupportedOperationException();
  }

  // redeclare to help optimizers with b/310253115

  public void testAddAll_unsupportedNothing() {
    try {
      assertFalse(
          "addAll(nothing) should return false or throw", collection.addAll(emptyCollection()));
    } catch (UnsupportedOperationException tolerated) {
    }
    expectUnchanged();
  }

  @CollectionFeature.Require(SUPPORTS_ADD)
  public void testAddAll_supportedNonePresent() {
    assertTrue(

    } catch (UnsupportedOperationException tolerated) {
    }
    expectUnchanged();
  }

  @MapFeature.Require(absent = SUPPORTS_PUT)
  @CollectionSize.Require(absent = ZERO)
  public void testPut_unsupportedPresentDifferentValue() {
    assertThrows(UnsupportedOperationException.class, () -> getMap().put(k0(), v3()));
    expectUnchanged();
  }

    static final PermittedMetaException UOE_OR_ISE =
        new PermittedMetaException("UnsupportedOperationException or IllegalStateException") {
          @Override
          boolean isPermitted(Exception exception) {
            return exception instanceof UnsupportedOperationException
                || exception instanceof IllegalStateException;
          }
        };

     *
     * @throws UnsupportedOperationException always
     * @deprecated Unsupported operation.
     */
    @CanIgnoreReturnValue
    @Deprecated
    @Override
    @DoNotCall("Always throws UnsupportedOperationException")
    public final boolean add(@ParametricNullness E e) {
      throw new UnsupportedOperationException();
    }

    /**

    sortedMap.put("three", 3);
    return sortedMap;
  }

  @Override
  protected String getKeyNotInPopulatedMap() throws UnsupportedOperationException {
    return "minus one";
  }

  @Override
  protected Integer getValueNotInPopulatedMap() throws UnsupportedOperationException {
    return -1;
  }

  @J2ktIncompatible // https://youtrack.jetbrains.com/issue/KT-58242/ undefined behavior (crash)
  @Override