};
    ImmutableMultiset<String> adds =
        new ImmutableMultiset.Builder<String>().addCopies("x", 10).build();
    multiset.addAll(adds);
    assertEquals(1, addCalls.get());
  }

  public void testRemoveUnsupported() {
    Multiset<String> multiset = new NoRemoveMultiset<>();
    multiset.add("a");
    try {
      multiset.remove("a");
      fail();
    } catch (UnsupportedOperationException expected) {
    }

        };
    ImmutableMultiset<String> adds =
        new ImmutableMultiset.Builder<String>().addCopies("x", 10).build();
    multiset.addAll(adds);
    assertEquals(1, addCalls.get());
  }

  public void testRemoveUnsupported() {
    Multiset<String> multiset = new NoRemoveMultiset<>();
    multiset.add("a");
    try {
      multiset.remove("a");
      fail();
    } catch (UnsupportedOperationException expected) {
    }

      fail("Expected IllegalArgumentException");
    } catch (IllegalArgumentException expected) {
    }
    expectUnchanged();
  }

  @CollectionFeature.Require(absent = SUPPORTS_REMOVE)
  public void testRemoveUnsupported() {
    try {
      getMultiset().remove(e0(), 2);
      fail("Expected UnsupportedOperationException");
    } catch (UnsupportedOperationException expected) {
    }
  }

      fail("Expected IllegalArgumentException");
    } catch (IllegalArgumentException expected) {
    }
    expectUnchanged();
  }

  @CollectionFeature.Require(absent = SUPPORTS_REMOVE)
  public void testRemoveUnsupported() {
    try {
      getMultiset().remove(e0(), 2);
      fail("Expected UnsupportedOperationException");
    } catch (UnsupportedOperationException expected) {
    }
  }

    assertThrows(
        UnsupportedOperationException.class,
        () -> rangeSet.addAll(ImmutableRangeSet.<Integer>of()));
  }

  @SuppressWarnings("DoNotCall")
  public void testRemoveUnsupported() {
    RangeSet<Integer> rangeSet =
        ImmutableRangeSet.<Integer>builder()
            .add(Range.closed(5, 8))
            .add(Range.closedOpen(1, 3))
            .build();

    assertThrows(
        UnsupportedOperationException.class,
        () -> rangeSet.addAll(ImmutableRangeSet.<Integer>of()));
  }

  @SuppressWarnings("DoNotCall")
  public void testRemoveUnsupported() {
    RangeSet<Integer> rangeSet =
        ImmutableRangeSet.<Integer>builder()
            .add(Range.closed(5, 8))
            .add(Range.closedOpen(1, 3))
            .build();