public void testSet_replacingNull() {
    E[] elements = createSamplesArray();
    int i = aValidIndex();
    elements[i] = null;
    collection = getSubjectGenerator().create(elements);

    doTestSet(e3());
  }

  private void doTestSet(E newValue) {
    int index = aValidIndex();
    E initialValue = getList().get(index);
    assertEquals(
        "set(i, x) should return the old element at position i.",
        initialValue,

                new TestStringCollectionGenerator() {
                  @Override
                  protected Collection<String> create(String[] elements) {
                    return new StandardImplForwardingCollection<>(
                        new LinkedList<>(asList(elements)));
                  }
                })
            .named("ForwardingCollection[LinkedList] with standard implementations")
            .withFeatures(

import org.jspecify.annotations.Nullable;

/**
 * Creates sorted maps, containing sample elements, to be tested.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
@NullMarked
public interface TestSortedMapGenerator<K extends @Nullable Object, V extends @Nullable Object>
    extends TestMapGenerator<K, V> {
  @Override
  SortedMap<K, V> create(Object... elements);

  /**

    ms.add("b", 2);
    SortedSet<String> elementSet = ms.elementSet();

    assertThat(elementSet.first()).isEqualTo("a");
    assertThat(elementSet.last()).isEqualTo("c");
    assertEquals(Ordering.natural(), elementSet.comparator());

    assertThat(elementSet.headSet("b")).containsExactly("a");
    assertThat(elementSet.tailSet("b")).containsExactly("b", "c").inOrder();

import com.google.common.base.Function;
import java.io.Serializable;
import java.util.Objects;
import org.jspecify.annotations.Nullable;

/**
 * An ordering that orders elements by applying an order to the result of a function on those
 * elements.
 */
@GwtCompatible
final class ByFunctionOrdering<F extends @Nullable Object, T extends @Nullable Object>
    extends Ordering<F> implements Serializable {

        QueueTestSuiteBuilder.using(
                new TestStringQueueGenerator() {

                  @Override
                  protected Queue<String> create(String[] elements) {
                    return new StandardImplForwardingQueue<>(new LinkedList<>(asList(elements)));
                  }
                })
            .named("ForwardingQueue[LinkedList] with standard implementations")
            .withFeatures(

  public static Test suite() {
    return SetTestSuiteBuilder.using(
            new TestStringSetGenerator() {
              @Override
              protected Set<String> create(String[] elements) {
                return MinimalSet.of(elements);
              }
            })
        .named("MinimalSet")
        .withFeatures(
            CollectionFeature.ALLOWS_NULL_VALUES, CollectionFeature.NONE, CollectionSize.ANY)

      @Override
      protected SortedSet<Integer> delegate() {
        return result;
      }
    };
  }

  @Override
  SortedSet<Integer> filter(SortedSet<Integer> elements, Predicate<? super Integer> predicate) {
    return Sets.filter(elements, predicate);
  }

import com.google.errorprone.annotations.CanIgnoreReturnValue;
import com.google.errorprone.annotations.Immutable;
import com.google.errorprone.annotations.InlineMe;

/**
 * A {@link Graph} whose elements and structural relationships will never change. Instances of this
 * class may be obtained with {@link #copyOf(Graph)}.
 *
 * <p>See the Guava User's Guide's <a

    suite.addTest(
        SetTestSuiteBuilder.using(
                new TestStringSetGenerator() {
                  @Override
                  protected Set<String> create(String[] elements) {
                    return CompactLinkedHashSet.create(asList(elements));
                  }
                })
            .named("CompactLinkedHashSet")
            .withFeatures(allFeatures)
            .createTestSuite());
    return suite;