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

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

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

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

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

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

    /** The specified user already exists */
    int NT_STATUS_USER_EXISTS = 0xC0000063;
    /** The specified user does not exist */
    int NT_STATUS_NO_SUCH_USER = 0xC0000064;
    /** The specified network password is not correct */
    int NT_STATUS_WRONG_PASSWORD = 0xC000006a;
    /** Logon failure: unknown user name or bad password */
    int NT_STATUS_LOGON_FAILURE = 0xC000006d;
    /** Logon failure: user account restriction */

    @ParameterizedTest
    @ValueSource(strings = { "NONE", "NO_TIMEOUT", "NO_RETRY", "RETAIN_PAYLOAD" })
    @DisplayName("valueOf(name) returns the correct enum and toString matches name")
    void valueOfResolvesNamesAndToString(String name) {
        RequestParam rp = RequestParam.valueOf(name);
        assertNotNull(rp);

If you added the return type annotation, tools and editors would complain with a (correct) error telling you that your function is returning a type (e.g. a dict) that is different from what you declared (e.g. a Pydantic model).

## Recap { #recap }

You can add multiple body parameters to your *path operation function*, even though a request can only have a single body.

But **FastAPI** will handle it, give you the correct data in your function, and validate and document the correct schema in the *path operation*.

You can also declare singular values to be received as part of the body.

        outputBuffer = new byte[1024];
        response = new TransTransactNamedPipeResponse(mockConfig, outputBuffer);
    }

    @Test
    void testConstructor() {
        // Verify that the response is created with correct configuration and buffer
        assertNotNull(response);

        // Use reflection to verify the outputBuffer is set correctly
        try {

            assertEquals(2000000L, basicInfo.getLastWriteTime());
            assertEquals(0L, basicInfo.getSize()); // Basic info always returns 0 for size
        }

        @Test
        @DisplayName("Should generate correct toString for basic info")
        void testBasicInfoToString() {
            Trans2QueryPathInformationResponse.SmbQueryFileBasicInfo basicInfo = response.new SmbQueryFileBasicInfo();

            basicInfo.attributes = 0x20;

Você verá a documentação automática da API para a sub-aplicação, incluindo apenas suas próprias _operações de rota_, todas sob o prefixo de sub-caminho correto `/subapi`:

<img src="/img/tutorial/sub-applications/image02.png">

    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);