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

    }

    @Test
    @DisplayName("Test isValid returns false for invalid negotiation")
    void testIsValidReturnsFalse() {
        // Arrange
        when(negotiationResponse.isValid(cifsContext, negotiationRequest)).thenReturn(false);

        // Act
        boolean result = negotiationResponse.isValid(cifsContext, negotiationRequest);

        // Assert

        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) {

    }

    // 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);

        when(mockFileHandle.isValid()).thenReturn(false);
        assertFalse(outputStream.isOpen());
    }

    @Test
    void testWriteAfterClose() throws IOException, CIFSException {
        // Given
        when(mockTreeHandle.isSMB2()).thenReturn(true);
        when(mockTreeHandle.getSendBufferSize()).thenReturn(65536);
        when(mockFileHandle.isValid()).thenReturn(true);

        validator.initialize(annotation);

        // Test that the method can be called (even if context handling is complex)
        try {
            final boolean result = validator.isValid("test", null);
            assertNotNull("isValid should return a boolean result", Boolean.valueOf(result));
        } catch (final NullPointerException e) {
            // This is expected if the implementation requires a non-null context

 * <p>Example usage:</p>
 * <pre>
 *     RequestHeader header = new RequestHeader("Content-Type", "application/json");
 *     String name = header.getName();
 *     String value = header.getValue();
 *     boolean isValid = header.isValid();
 * </pre>
 *
 * <p>Note: The name should not be blank and the value should not be null for the header to be considered valid.</p>
 *
 * @see java.io.Serializable
 */

        // When
        boolean valid = response.isValid(mockContext, mockRequest);

        // Then
        assertTrue(valid);
        assertEquals(DialectVersion.SMB311, response.getSelectedDialect());
    }

    @Test
    @DisplayName("Should fail validation when not received")
    void testIsValidNotReceived() {
        // When
        boolean valid = response.isValid(mockContext, mockRequest);

        // Then