@RetainedLocalRef Future<?> localTimer = timer;
    // Try to cancel the timer as an optimization.
    // timer may be null if this call to run was by the timer task since there is no happens-before
    // edge between the assignment to timer and an execution of the timer task.
    if (localTimer != null) {
      localTimer.cancel(false);
    }

    delegateRef = null;
    timer = null;
  }

            int result = response.readBytesWireFormat(buffer, bufferIndex);
            assertEquals(2, result, "Should consistently return 2 on call " + (i + 1));
        }
    }

    @Test
    @DisplayName("Test edge case with maximum buffer index")
    void testReadBytesWireFormatMaxBufferIndex() throws SMBProtocolDecodingException {
        byte[] buffer = new byte[65536]; // Large buffer
        int bufferIndex = 65534; // Near the end

        // Third invocation
        curtainFinallyHook.hook(assistantDirector);

        // All invocations should complete successfully
        assertTrue(true);
    }

    // Test with null assistant director (edge case)
    public void test_hook_withNullAssistantDirector() {
        // Hook should handle null parameter gracefully
        curtainFinallyHook.hook(null);

        // Verify no NullPointerException is thrown

        assertEquals(0L, response.getOffset(), "Offset should be initialized to 0");
    }

    /* ------------------------------------------------------------------ */
    /* 2. Parameter word reading - happy path & edge cases                */
    /* ------------------------------------------------------------------ */

    /**
     * Provides test cases for {@link SmbComSeekResponse#readParameterWordsWireFormat(byte[], int)}.

        auth.handle(new Callback[] { pc });
        assertEquals("secret", new String(pc.getPassword()));
    }

    @Test
    @DisplayName("handle: empty user/domain edge yields '@' and null password")
    void testHandleWithEmptyUserAndDomainEdge() throws Exception {
        // Default constructor results in empty strings for user and domain, null for password

        assertEquals(17, JvmUtil.getJavaVersion());

        System.setProperty("java.version", "8.0.332");
        assertEquals(8, JvmUtil.getJavaVersion());

        // Edge case: version starts with 1 but not old format
        System.setProperty("java.version", "18.0.1");
        assertEquals(18, JvmUtil.getJavaVersion());

        // Test with extra parts

 * @since 20.0
 */
@Beta
@DoNotMock
public final class GraphBuilder<N> extends AbstractGraphBuilder<N> {

  /** Creates a new instance with the specified edge directionality. */
  private GraphBuilder(boolean directed) {
    super(directed);
  }

  /** Returns a {@link GraphBuilder} for building directed graphs. */
  public static GraphBuilder<Object> directed() {

        assertNotNull(newInstance);

        // Verify default values work for new instance
        assertEquals("warm", newInstance.getLastaDiSmartDeployMode());
    }

    // Test edge cases for mail configuration
    public void xtest_mailConfiguration_edgeCases() {
        // Test with empty host and port
        FessEnv.SimpleImpl emptyMailEnv = new FessEnv.SimpleImpl() {

            assertFalse((writeOnly & ACE.FILE_READ_DATA) != 0, "Write should not include FILE_READ_DATA");
        }
    }

    @Nested
    @DisplayName("Boundary Conditions and Edge Cases")
    class BoundaryConditionsTests {

        @Test
        @DisplayName("Should handle signed/unsigned integer boundaries")
        void shouldHandleSignedUnsignedBoundaries() {

    putEdge(N1, N2);

    assertThat(graphAsMutableGraph.putEdge(N2, N1)).isFalse();
  }

  /**
   * Tests that the method {@code putEdge} will silently add the missing nodes to the graph, then
   * add the edge connecting them. We are not using the proxy methods here as we want to test {@code
   * putEdge} when the end-points are not elements of the graph.
   */
  @Test
  public void putEdge_nodesNotInGraph() {