@Override
  public void setUp() throws Exception {
    super.setUp();
    this.equivalenceMock = new MockEquivalence();
    this.tester = EquivalenceTester.of(equivalenceMock);
  }

  /** Test null reference yields error */
  public void testOf_nullPointerException() {
    assertThrows(NullPointerException.class, () -> EquivalenceTester.of(null));
  }

  public void testTest_noData() {
    tester.test();
  }

class StaticJAASConfigurationTest {

    // Constants used in assertions
    private static final String EXPECTED_LOGIN_MODULE = "com.sun.security.auth.module.Krb5LoginModule";

    @Test
    @DisplayName("Default constructor yields REQUIRED Krb5 entry with empty options")
    void defaultConstructor_producesRequiredKrb5EntryWithEmptyOptions() {
        // Arrange
        StaticJAASConfiguration cfg = new StaticJAASConfiguration();

        // Act

   * all subscribers in the order they are posted.
   *
   * <p>When all subscribers are dispatched to using a <i>direct</i> executor (which dispatches on
   * the same thread that posts the event), this yields a breadth-first dispatch order on each
   * thread. That is, all subscribers to a single event A will be called before any subscribers to
   * any events B and C that are posted to the event bus by the subscribers to A.
   */

        verify(spyAuth, times(1)).getPasswordAsCharArray();
    }

    @Test
    @DisplayName("clone: copies fields and cached subject; instances are independent")
    void testCloneCopiesFieldsAndIndependence() throws Exception {
        // Use configuration-based constructor to also exercise copying of configuration/service fields
        JAASAuthenticator orig = new JAASAuthenticator(new HashMap<String, String>(), "DOM", "user", "pass");

        // Act
        itr.remove();

        // Assert
        verify(delegate, times(1)).remove();
    }

    @Test
    @DisplayName("Edge: empty delegate yields no elements")
    void emptyDelegate_hasNoNext() {
        // Arrange - no parent setup needed since no URLs are created
        when(delegate.hasNext()).thenReturn(false);

 * Runs a [TaskRunner] in a controlled environment so that everything is sequential and
 * deterministic.
 *
 * This class ensures that at most one thread is running at a time. This is initially the JUnit test
 * thread, which yields its execution privilege while calling [runTasks], [runNextTask], or
 * [advanceUntil]. These functions don't return until the task threads are all idle.
 *
 * Task threads release their execution privilege in these ways:
 *

 * that order.
 *
 * <p>By default, {@code Splitter}'s behavior is simplistic and unassuming. The following
 * expression:
 *
 * {@snippet :
 * Splitter.on(',').split(" foo,,,  bar ,")
 * }
 *
 * ... yields the substrings {@code [" foo", "", "", " bar ", ""]}. If this is not the desired
 * behavior, use configuration methods to obtain a <i>new</i> splitter instance with modified
 * behavior:
 *
 * {@snippet :

        // Arrange
        SecurityBlob blob = new SecurityBlob(new byte[] { 1, 2, 3 });

        // Force internal field to null via reflection to exercise defensive branch
        Field field = SecurityBlob.class.getDeclaredField("b");
        field.setAccessible(true);
        field.set(blob, null);

        // Act & Assert
        assertEquals(0, blob.length(), "length() should return 0 when internal array is null");

 *
 * <p>Implementations of this interface are expected to be thread-safe, and can be safely accessed
 * by multiple concurrent threads.
 *
 * <p>When evaluated as a {@link Function}, a cache yields the same result as invoking {@link
 * #getUnchecked}.
 *
 * @param <K> the type of the cache's keys, which are not permitted to be null
 * @param <V> the type of the cache's values, which are not permitted to be null

 * that order.
 *
 * <p>By default, {@code Splitter}'s behavior is simplistic and unassuming. The following
 * expression:
 *
 * {@snippet :
 * Splitter.on(',').split(" foo,,,  bar ,")
 * }
 *
 * ... yields the substrings {@code [" foo", "", "", " bar ", ""]}. If this is not the desired
 * behavior, use configuration methods to obtain a <i>new</i> splitter instance with modified
 * behavior:
 *
 * {@snippet :