import junit.framework.Assert;
import junit.framework.AssertionFailedError;
import org.checkerframework.checker.nullness.qual.Nullable;

@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
public class Helpers {
  // Clone of Objects.equal
  static boolean equal(@Nullable Object a, @Nullable Object b) {
    return a == b || (a != null && a.equals(b));
  }

  // Clone of Lists.newArrayList

    List<?> list = Arrays.asList("a", "b");
    Helpers.assertContains(list, "a");
    Helpers.assertContains(list, "b");

    try {
      Helpers.assertContains(list, "c");
      throw new Error();
    } catch (AssertionFailedError expected) {
    }
  }

  public void testAssertContainsAllOf() {
    List<?> list = Arrays.asList("a", "a", "b", "c");
    Helpers.assertContainsAllOf(list, "a");

    expectMissing(Helpers.mapEntry(k0(), v0()));
    assertEquals(getNumElements() - 1, multimap().size());
    assertFalse(multimap().containsEntry(k0(), v0()));
  }

  @CollectionSize.Require(absent = ZERO)
  @MapFeature.Require(SUPPORTS_REMOVE)
  public void testRetainAllPropagatesToMultimap() {
    multimap().entries().retainAll(Collections.singleton(Helpers.mapEntry(k0(), v0())));

  public void testEntrySetEquals() {
    resetContainer(
        Helpers.mapEntry(k0(), v0()), Helpers.mapEntry(k1(), v0()), Helpers.mapEntry(k0(), v3()));
    Set<Entry<K, Collection<V>>> expected = Sets.newHashSet();
    expected.add(Helpers.mapEntry(k0(), (Collection<V>) Sets.newHashSet(v0(), v3())));
    expected.add(Helpers.mapEntry(k1(), (Collection<V>) Sets.newHashSet(v0())));

  public void testEntrySetEquals() {
    resetContainer(
        Helpers.mapEntry(k0(), v0()), Helpers.mapEntry(k1(), v0()), Helpers.mapEntry(k0(), v3()));
    Set<Entry<K, Collection<V>>> expected = Sets.newHashSet();
    expected.add(Helpers.mapEntry(k0(), (Collection<V>) Lists.newArrayList(v0(), v3())));
    expected.add(Helpers.mapEntry(k1(), (Collection<V>) Lists.newArrayList(v0())));

 * limitations under the License.
 */

package com.google.common.collect.testing.google;

import static com.google.common.collect.testing.Helpers.assertContains;
import static com.google.common.collect.testing.Helpers.assertEmpty;
import static com.google.common.collect.testing.Helpers.assertEqualIgnoringOrder;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;

    assertEquals(multimap(), target);
  }

  @MapFeature.Require(SUPPORTS_PUT)
  public void testPutAll() {
    Multimap<K, V> source =
        getSubjectGenerator().create(Helpers.mapEntry(k0(), v3()), Helpers.mapEntry(k3(), v3()));
    assertTrue(multimap().putAll(source));
    assertTrue(multimap().containsEntry(k0(), v3()));
    assertTrue(multimap().containsEntry(k3(), v3()));
  }

            .create(
                Helpers.mapEntry(k0(), v0()),
                Helpers.mapEntry(k0(), v1()),
                Helpers.mapEntry(k0(), v4()));
    SetMultimap<K, V> multimap2 =
        getSubjectGenerator()
            .create(
                Helpers.mapEntry(k0(), v1()),
                Helpers.mapEntry(k0(), v0()),
                Helpers.mapEntry(k0(), v4()));

            .create(
                Helpers.mapEntry(k0(), v0()),
                Helpers.mapEntry(k0(), v1()),
                Helpers.mapEntry(k0(), v0()));
    ListMultimap<K, V> multimap2 =
        getSubjectGenerator()
            .create(
                Helpers.mapEntry(k0(), v1()),
                Helpers.mapEntry(k0(), v0()),
                Helpers.mapEntry(k0(), v0()));

    super.setUp();
    navigableMap = (SortedMap<K, V>) getMap();
    List<Entry<K, V>> entries =
        Helpers.copyToList(
            getSubjectGenerator()
                .getSampleElements(getSubjectGenerator().getCollectionSize().getNumElements()));
    Collections.sort(entries, Helpers.<K, V>entryComparator(navigableMap.comparator()));

    // some tests assume SEVERAL == 3
    if (entries.size() >= 1) {