@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")
// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public class CollectionToArrayTester<E> extends AbstractCollectionTester<E> {
  public void testToArray_noArgs() {
    Object[] array = collection.toArray();
    expectArrayContentsAnyOrder(createSamplesArray(), array);

@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")
// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public abstract class AbstractMultisetSetCountTester<E> extends AbstractMultisetTester<E> {
  /*
   * TODO: consider adding MultisetFeatures.SUPPORTS_SET_COUNT. Currently we

@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")
// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
@NullMarked
public abstract class AbstractMapTester<K extends @Nullable Object, V extends @Nullable Object>
    extends AbstractContainerTester<Map<K, V>, Entry<K, V>> {
  protected Map<K, V> getMap() {

@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")
// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public class MultisetEntrySetTester<E> extends AbstractMultisetTester<E> {

  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testEntrySet_clear() {
    getMultiset().entrySet().clear();

@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")
// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
@NullMarked
public abstract class AbstractContainerTester<C, E extends @Nullable Object>
    extends AbstractTester<OneSizeTestContainerGenerator<C, E>> {
  protected SampleElements<E> samples;

@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")
// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public class ListSubListTester<E> extends AbstractListTester<E> {
  public void testSubList_startNegative() {
    assertThrows(IndexOutOfBoundsException.class, () -> getList().subList(-1, 0));
  }

@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")
// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public class ListSubListTester<E> extends AbstractListTester<E> {
  public void testSubList_startNegative() {
    assertThrows(IndexOutOfBoundsException.class, () -> getList().subList(-1, 0));
  }

@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")
// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public class MultisetNavigationTester<E> extends AbstractMultisetTester<E> {
  private SortedMultiset<E> sortedMultiset;
  private List<E> entries;
  private Entry<E> a;
  private Entry<E> b;

@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")
// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public class MultisetNavigationTester<E> extends AbstractMultisetTester<E> {
  private SortedMultiset<E> sortedMultiset;
  private List<E> entries;
  private Entry<E> a;
  private Entry<E> b;