```

Obviamente, você provavelmente vai encontrar maneiras muito melhores de se aproveitar disso do que a formatação de JSON. 😉

## Classe de resposta padrão { #default-response-class }

Quando você criar uma instância da classe **FastAPI** ou um `APIRouter` você pode especificar qual classe de resposta utilizar por padrão.

O padrão que define isso é o `default_response_class`.

Em contraste com a "**imagem de contêiner**" que contém os conteúdos estáticos armazenados, um "**contêiner**" normalmente se refere à instância rodando, a coisa que está sendo **executada**.

Você pode criar as *operações de rotas* para esse módulo usando o `APIRouter`.

### Importe `APIRouter` { #import-apirouter }

você o importa e cria uma "instância" da mesma maneira que faria com a classe `FastAPI`:

{* ../../docs_src/bigger_applications/app_an_py39/routers/users.py hl[1,3] title["app/routers/users.py"] *}

        // Test getInstance when no instance has been set
        // Should default to System.err
        LogStream instance = LogStream.getInstance();
        assertNotNull(instance);

        // Getting instance again should return the same instance
        LogStream instance2 = LogStream.getInstance();
        assertSame(instance, instance2);
    }

    @Test
    void testSetInstanceAndGetInstance() {

        SmbShareInfo instance3 = new SmbShareInfo("SHARE2", 0, "remark1");
        Object notAShareInfo = new Object();

        assertTrue(instance1.equals(instance2)); // Should be equal based on netName
        assertFalse(instance1.equals(instance3)); // Should not be equal
        assertFalse(instance1.equals(notAShareInfo)); // Should not be equal to other types

        assertEquals("instance2", transformer2.getName());
        assertEquals("instance3", transformer3.getName());

        // Change one instance's name
        transformer2.setName("changed2");

        // Others should remain unchanged
        assertEquals("instance1", transformer1.getName());
        assertEquals("changed2", transformer2.getName());

        // Then
        assertNotSame(instance1, instance2);
        assertEquals(instance1.getCommand(), instance2.getCommand());
        assertNotEquals(instance1.toString(), instance2.toString()); // Different object references in toString
    }

    /**
     * Test thread safety of read/write operations
     */
    @Test
    @DisplayName("Test thread safety of operations")

   *       is used to construct the sample instances. In case of tie, the candidate constructors or
   *       factories are tried one after another until one can be used to construct sample
   *       instances.
   *   <li>For the constructor or static factory method used to construct instances, it's checked
   *       that when equal parameters are passed, the result instance should also be equal; and vice
   *       versa.

    }

    @Test
    @DisplayName("getRequest should return the same request instance")
    void testGetRequest() {
        // Verify getRequest returns the exact same instance
        SmbNegotiationRequest request = negotiation.getRequest();
        assertSame(mockRequest, request);

        // Verify multiple calls return the same instance
        assertSame(request, negotiation.getRequest());
    }

    @Test

    /**
     * Creates a new instance of DataStoreFactory.
     * This constructor initializes the factory for managing data store instances
     * and provides methods for registration, retrieval, and plugin discovery.
     */
    public DataStoreFactory() {
        // Default constructor with explicit documentation
    }

    /**
     * Registers a data store instance with the factory using the specified name.