│   └── test_main.py
```

Digamos que ahora el archivo `main.py` con tu aplicación de **FastAPI** tiene algunas otras **path operations**.

Tiene una operación `GET` que podría devolver un error.

Tiene una operación `POST` que podría devolver varios errores.

Ambas *path operations* requieren un `X-Token` header.

//// tab | Python 3.10+

```Python
{!> ../../docs_src/app_testing/app_b_an_py310/main.py!}

read_items["/items/"]
read_users["/users/"]

common_parameters --> read_items
common_parameters --> read_users
```

De esta manera escribes código compartido una vez y **FastAPI** se encarga de llamarlo para tus *path operations*.

/// check | Revisa

Nota que no tienes que crear una clase especial y pasarla en algún lugar a **FastAPI** para "registrarla" o algo similar.

Solo la pasas a `Depends` y **FastAPI** sabe cómo hacer el resto.

Deberías hacerlo después de agregar todas tus *path operations*.

{* ../../docs_src/path_operation_advanced_configuration/tutorial002.py hl[2, 12:21, 24] *}

/// tip | Consejo

Si llamas manualmente a `app.openapi()`, deberías actualizar los `operationId`s antes de eso.

///

/// warning | Advertencia

* Um programa específico enquanto está **em execução** no sistema operacional.
    * Isso não se refere ao arquivo, nem ao código, refere-se **especificamente** à coisa que está sendo **executada** e gerenciada pelo sistema operacional.

If you want to use your APIs' function names as `operationId`s, you can iterate over all of them and override each *path operation's* `operation_id` using their `APIRoute.name`.

You should do it after adding all your *path operations*.

{* ../../docs_src/path_operation_advanced_configuration/tutorial002.py hl[2, 12:21, 24] *}

/// tip

            verify(mockResource).setLastAccess(testTime);
        }
    }

    @Nested
    @DisplayName("File Operations Tests")
    class FileOperationsTests {

        @Test
        @DisplayName("file creation operations should work correctly")
        void testFileCreation() throws CIFSException {
            // When/Then
            assertDoesNotThrow(() -> {

        double avgOpTimeNs = totalTime.get() / (double) operations.get();

        System.out.printf("Encryption Byte Tracking Performance: %d ops in %.2f ms%n", operations.get(), overallTimeMs);
        System.out.printf("  Avg atomic operation time: %.2f ns%n", avgOpTimeNs);

        // Verify lock-free performance (allowing for JVM overhead)
        assertTrue(avgOpTimeNs < 5000, "Atomic operations should be reasonably fast (no lock contention)");

 * text during indexing and search operations.
 *
 * <p>Each mapping item consists of one or more input character sequences that are mapped to a single output
 * character sequence. The mapping supports both original values and new values for update operations.</p>
 */
public class CharMappingItem extends DictionaryItem {
    /**

In that case, they will be applied to all the *path operations* in the application:

{* ../../docs_src/dependencies/tutorial012_an_py39.py hl[16] *}


And all the ideas in the section about [adding `dependencies` to the *path operation decorators*](dependencies-in-path-operation-decorators.md){.internal-link target=_blank} still apply, but in this case, to all of the *path operations* in the app.

```Python hl_lines="1  3" title="app/routers/users.py"
{!../../docs_src/bigger_applications/app/routers/users.py!}
```

### *Path operations* with `APIRouter` { #path-operations-with-apirouter }

And then you use it to declare your *path operations*.

Use it the same way you would use the `FastAPI` class:

```Python hl_lines="6  11  16" title="app/routers/users.py"