assertEquals(longMessage, exception.getMessage());
        assertNull(exception.getCause());
    }

    @Test
    public void test_constructor_withNestedCause() {
        // Test constructor with nested exception causes
        Exception rootCause = new IllegalStateException("Root cause");
        Exception middleCause = new RuntimeException("Middle cause", rootCause);
        String message = "Top level dictionary error";

Just functions that look the same as the *path operation functions*.

But still, it is very powerful, and allows you to declare arbitrarily deeply nested dependency "graphs" (trees).

/// tip

All this might not seem as useful with these simple examples.

But you will see how useful it is in the chapters about **security**.

 * <ul>
 *   <li>Debugging and troubleshooting of request flows</li>
 *   <li>Audit logging of operations</li>
 *   <li>Performance monitoring of nested operations</li>
 * </ul>
 *
 * <p>This interface is designed to be extended by specific request types that handle
 * different Maven operations. All implementations must be immutable to ensure thread safety

    }

    /**
     * Gets a nested Map from the map.
     *
     * @param map The source map
     * @param key The key to look up
     * @return The nested Map, or null if the key doesn't exist or value is not a Map
     */
    @SuppressWarnings("unchecked")

    public void setGroupCacheExpiry(final long groupCacheExpiry) {
        this.groupCacheExpiry = groupCacheExpiry;
    }

    /**
     * Sets the maximum group depth for nested group processing.
     * @param maxGroupDepth The maximum depth for nested groups.
     */
    public void setMaxGroupDepth(final int maxGroupDepth) {
        this.maxGroupDepth = maxGroupDepth;
    }

    @Override

        // getMessage() may return null when constructed with null
        // This is expected behavior for exceptions with null cause
    }

    @Test
    public void test_nestedCause() {
        // Test with nested exceptions
        RuntimeException rootCause = new RuntimeException("Root cause");
        ParseException parseException = new ParseException("Parse error");
        parseException.initCause(rootCause);

        assertEquals(0, SessionSetupHandler.class.getDeclaredFields().length, "No fields expected");
        assertEquals(0, SessionSetupHandler.class.getDeclaredClasses().length, "No nested types expected");
    }

    @ParameterizedTest(name = "Implementation is instance: {0}")
    @MethodSource("implementations")
    @DisplayName("Happy path: can create implementations and use type checks")

      if (!GUAVA_PACKAGES.contains(info.getPackageName())) {
        continue;
      }
      if (
      /*
       * At least one of the classes nested inside TypeResolverTest triggers a bug under older JDKs:
       * https://bugs.openjdk.org/browse/JDK-8215328 -> https://bugs.openjdk.org/browse/JDK-8215470

Vous pouvez créer des applications de production avec **FastAPI** dès maintenant (et vous le faites probablement depuis un certain temps), vous devez juste vous assurer que vous utilisez une version qui fonctionne correctement avec le reste de votre code.

## Épingler votre version de `fastapi` { #pin-your-fastapi-version }

### Tags com Enums { #tags-with-enums }

Se você tem uma grande aplicação, você pode acabar acumulando **várias tags**, e você gostaria de ter certeza de que você sempre usa a ** mesma tag** para *operações de rota* relacionadas.

Nestes casos, pode fazer sentido armazenar as tags em um `Enum`.

**FastAPI** suporta isso da mesma maneira que com strings simples:

{* ../../docs_src/path_operation_configuration/tutorial002b_py310.py hl[1,8:10,13,18] *}