// Act
            String result = uuid.toString();

            // Assert
            assertEquals(VALID_UUID_STRING, result.toUpperCase(), "toString() should return the correct UUID string in uppercase");
        }

        @Test
        @DisplayName("toString() should work correctly for UUID created from string")
        void testToStringFromConstructorWithString() {

        int expectedBytes = 12 + (fileName.length() * 2); // Unicode is 2 bytes per char
        assertEquals(expectedBytes, bytesRead);
    }

    @Test
    @DisplayName("Test getAction returns correct value")
    void testGetAction() throws SMBProtocolDecodingException {
        int expectedAction = FileNotifyInformation.FILE_ACTION_RENAMED_NEW_NAME;

        assertNotNull(DialectVersion.SMB300);
        assertNotNull(DialectVersion.SMB302);
        assertNotNull(DialectVersion.SMB311);
    }

    @Test
    @DisplayName("Should have correct version ordering")
    void testVersionOrdering() {
        // SMB versions should be ordered chronologically
        assertTrue(DialectVersion.SMB1.compareTo(DialectVersion.SMB202) < 0);

        // Test with various messages
        String message = "Test error message";
        TransportException exception = new TransportException(message);

        // Verify the exception has the correct message
        assertNotNull(exception);
        assertEquals(message, exception.getMessage());
        assertNull(exception.getCause());

        // Test with empty string

    assertEquals(1, (int) iter.peek());
    assertEquals(1, (int) iter.next());

    /*
     * We test peek() after various calls to make sure that one bad call doesn't interfere with its
     * ability to throw the correct exception in the future.
     */
    assertThrows(NoSuchElementException.class, iter::peek);
    assertThrows(NoSuchElementException.class, iter::peek);
    assertThrows(NoSuchElementException.class, iter::next);

    assertEquals(1, (int) iter.peek());
    assertEquals(1, (int) iter.next());

    /*
     * We test peek() after various calls to make sure that one bad call doesn't interfere with its
     * ability to throw the correct exception in the future.
     */
    assertThrows(NoSuchElementException.class, iter::peek);
    assertThrows(NoSuchElementException.class, iter::peek);
    assertThrows(NoSuchElementException.class, iter::next);

    private static final int TEST_FID = 0x1234;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
    }

    @Test
    @DisplayName("Constructor should initialize with correct values")
    void testConstructor() {
        // Act
        transPeekNamedPipe = new TransPeekNamedPipe(mockConfig, TEST_PIPE_NAME, TEST_FID);

        // Assert
        assertNotNull(transPeekNamedPipe);

This gives you a lot of **flexibility**. You can return any data type, override any data declaration or validation, etc.

It also gives you a lot of **responsibility**. You have to make sure that the data you return is correct, in the correct format, that it can be serialized, etc.

## Using the `jsonable_encoder` in a `Response` { #using-the-jsonable-encoder-in-a-response }

    if (dividend >= 0) {
      return dividend / divisor;
    }

    /*
     * Otherwise, approximate the quotient, check, and correct if necessary. Our approximation is
     * guaranteed to be either exact or one less than the correct value. This follows from fact that
     * floor(floor(x)/i) == floor(x/i) for any real x and integer i != 0. The proof is not quite
     * trivial.
     */

    assertEquals("correct", f.apply(new Object()));
    assertEquals("correct", f.apply(null));

    Function<@Nullable Object, @Nullable String> g = Functions.constant(null);
    assertThat(g.apply(2)).isNull();
    assertThat(g.apply(null)).isNull();

    new EqualsTester()
        .addEqualityGroup(f, Functions.constant("correct"))