import java.util.Set;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;

/**
 * Tests that all {@code public static} methods "inherited" from superclasses are "overridden" in
 * each immutable-collection class. This ensures, for example, that a call written "{@code
 * ImmutableSortedSet.copyOf()}" cannot secretly be a call to {@code ImmutableSet.copyOf()}.
 *

  }

  /**
   * Returns an object responsible for performing sanity tests against the return values of all
   * public static methods declared by {@code cls}, excluding superclasses.
   */
  public FactoryMethodReturnValueTester forAllPublicStaticMethods(Class<?> cls) {
    ImmutableList.Builder<Invokable<?, ?>> builder = ImmutableList.builder();
    for (Method method : cls.getDeclaredMethods()) {

   * replace "Strong" with "Soft" or "Weak" within the pasted text. The primary difference is that
   * strong entries store the key reference directly while soft and weak entries delegate to their
   * respective superclasses.
   */

  /** Used for strongly-referenced keys. */
  private static class StrongEntry<K, V> extends AbstractReferenceEntry<K, V> {
    final K key;