void setUp() throws Exception {
        // Backup system properties to restore them after each test
        originalSystemProperties = (Properties) System.getProperties().clone();
        // Reset static state of the Handler class before each test for isolation
        resetHandlerState();
        handler = new Handler(mockCifsContext);
    }

    @AfterEach
    void tearDown() throws Exception {

                         * server will return "Access denied" even if a logoff is
                         * sent. Unfortunately calling disconnect() doesn't always
                         * actually shutdown the connection before other threads
                         * have committed themselves (e.g. InterruptTest example).
                         */
                        try {
                            trans.disconnect(true);

        }
        return OptionalEntity.of(list.get(0));
    }

    /**
     * Stores (inserts or updates) a data configuration.
     *
     * <p>This method encrypts sensitive handler parameters before storing
     * and immediately refreshes the index to ensure the change is visible.
     * If the configuration already exists (based on ID), it will be updated;
     * otherwise, a new configuration will be created.</p>

   *
   * This method returns immediately.
   */
  fun send(bytes: ByteString): Boolean

  /**
   * Attempts to initiate a graceful shutdown of this web socket. Any already-enqueued messages will
   * be transmitted before the close message is sent but subsequent calls to [send] will return
   * false and their messages will not be enqueued.
   *
   * This returns true if a graceful shutdown was initiated by this call. It returns false if

    public String scope;
    /** The NetBIOS name type/suffix (hexadecimal code) */
    public int hexCode;
    int srcHashCode; /* srcHashCode must be set by name resolution
                      * routines before entry into addressCache
                      */

    Name() {
    }

    /**
     * Creates a NetBIOS name with the specified attributes.
     *

     * mirror, its URL and ID will be updated to match the values from the mirror specification. Repositories without a
     * matching mirror will pass through unchanged. Note: This method must be called before
     * {@link #injectAuthentication(List, List)} or the repositories will end up with the wrong credentials.
     *
     * @param repositories The repositories into which to inject the mirror information, may be {@code null}.

        // Act & Assert
        assertThrows(NullPointerException.class, () -> handler.openConnection(null), "Null URL should throw NPE");
        verify(mockCtx, never()).getConfig(); // no interaction expected on failure before construction
    }

    @Test
    @DisplayName("openConnection uses SingletonContext when no context provided")
    void testOpenConnection_UsesSingletonContext() throws Exception {
        // Arrange

Using `dataindependenttiming=1` enables the DIT mode for the entire Go program.
When enabled, DIT will be enabled when calling into C from Go. When enabled,
calling into Go code from C will enable DIT, and disable it before returning to
C if it was not enabled when Go code was entered.
This currently only affects arm64 programs. For all other platforms it is a no-op.

    - [Avoiding Collisions in IP allocation to Services](#avoiding-collisions-in-ip-allocation-to-services)
  - [Urgent Upgrade Notes](#urgent-upgrade-notes)
    - [(No, really, you MUST read this before you upgrade)](#no-really-you-must-read-this-before-you-upgrade)
  - [Changes by Kind](#changes-by-kind-17)
    - [Deprecation](#deprecation)
    - [API Change](#api-change-4)
    - [Feature](#feature-15)

## Urgent Upgrade Notes

### (No, really, you MUST do this before you upgrade)

Before upgrading to Kubernetes 1.13, you must keep the following in mind:

- kube-apiserver