*   override fun intercept(chain: Interceptor.Chain): Response {
 *     if (myConfig.isInvalid()) {
 *       return Response.Builder()
 *           .request(chain.request())
 *           .protocol(Protocol.HTTP_1_1)
 *           .code(400)
 *           .message("client config invalid")
 *           .body("client config invalid".toResponseBody(null))
 *           .build()
 *     }
 *

        assertTrue(validator.isValid(null, context));
    }

    public void test_isValid_blankValue() {
        final ConstraintValidatorContext context = null;
        assertTrue(validator.isValid(" ", context));
        assertTrue(validator.isValid("   ", context));
        assertTrue(validator.isValid("\t", context));
        assertTrue(validator.isValid("\n", context));
    }

    }

    /**
     * Test isValid() when the handle is valid.
     */
    @Test
    void testIsValid_whenValid() {
        when(smbFileHandle.isValid()).thenReturn(true);
        assertTrue(smbFileHandle.isValid(), "isValid should return true when the handle is valid.");
        verify(smbFileHandle, times(1)).isValid();
    }

    /**
     * Test isValid() when the handle is invalid.
     */
    @Test

    }

    // Ensures watch() fails fast if the underlying handle is invalid
    @Test
    @DisplayName("watch() throws when handle invalid")
    void watch_invalidHandle_throwsSmbException() throws Exception {
        when(handle.isValid()).thenReturn(false);
        SmbWatchHandleImpl sut = new SmbWatchHandleImpl(handle, 0, false);

        assertTrue(h.isValid());

        // Tree id change makes it invalid
        when(tree.getTreeId()).thenReturn(11L);
        assertFalse(h.isValid());

        // Connected=false makes it invalid
        when(tree.getTreeId()).thenReturn(10L);
        when(tree.isConnected()).thenReturn(false);
        assertFalse(h.isValid());

        // Mark closed makes it invalid

            return false;
        }

        if (!context.isValid()) {
            throw new CIFSException("Preauth integrity context is invalid for session: " + sessionId);
        }

        byte[] actualHash = context.getCurrentHash();
        boolean isValid = MessageDigest.isEqual(actualHash, expectedHash);

        if (isValid) {

            fail("Expected CIFSException");
        } catch (CIFSException e) {
            // Expected
        }

        assertFalse(context.isValid());

        // Further operations on invalid context should fail
        assertThrows(CIFSException.class, () -> {
            preauthService.updatePreauthHash(sessionId, "test".getBytes());
        });
    }

    @Test

        // Re-prepare state for second branch: not open but handle set
        when(fileHandle.isValid()).thenReturn(false);
        // Need to reopen logic to set handle again
        // Reset open flag by reconstructing target
        target = new SmbPipeHandleImpl(pipe);

        target.ensureOpen(); // handle present but invalid per isValid=false
        target.close();
        verify(fileHandle, atLeastOnce()).release();
    }

      ParseException parseException = new ParseException("Invalid host specifier: " + specifier, 0);
      parseException.initCause(e);
      throw parseException;
    }
  }

  /**
   * Determines whether {@code specifier} represents a valid {@link HostSpecifier} as described in
   * the documentation for {@link #fromValid(String)}.
   */
  public static boolean isValid(String specifier) {
    try {

        }

        @Test
        @DisplayName("Should detect invalid signature")
        void testVerifyInvalidSignature() {
            // Set signed flag
            SMBUtil.writeInt4(ServerMessageBlock2.SMB2_FLAGS_SIGNED, data, 16);

            // Place invalid signature
            byte[] invalidSignature = new byte[SIGNATURE_LENGTH];