Estes exemplos são intencionalmente simples, porém mostram como tudo funciona.

Nos capítulos sobre segurança, existem funções utilitárias que são implementadas desta maneira.

Se você entendeu tudo isso, você já sabe como essas funções utilitárias para segurança funcionam por debaixo dos panos.

///

import org.jspecify.annotations.Nullable;

/**
 * Legacy version of {@link java.util.function.Function java.util.function.Function}.
 *
 * <p>The {@link Functions} class provides common functions and related utilities.
 *
 * <p>As this interface extends {@code java.util.function.Function}, an instance of this type can be
 * used as a {@code java.util.function.Function} directly. To use a {@code

 */
@DisplayName("UpgradeContext")
class UpgradeContextTest {

    @Test
    @DisplayName("should create context successfully")
    void shouldCreateContextSuccessfully() {
        // Use existing test utilities to create a context
        UpgradeContext context = TestUtils.createMockContext(Paths.get("/test"));

        // Verify context is created and basic methods work
        assertNotNull(context, "Context should be created");

# Alte 403-Authentifizierungsfehler-Statuscodes verwenden { #use-old-403-authentication-error-status-codes }

Vor FastAPI-Version `0.122.0` verwendeten die integrierten Sicherheits-Utilities den HTTP-Statuscode `403 Forbidden`, wenn sie dem Client nach einer fehlgeschlagenen Authentifizierung einen Fehler zurückgaben.

///

/// info

In this example we use invented custom headers `X-Key` and `X-Token`.

But in real cases, when implementing security, you would get more benefits from using the integrated [Security utilities (the next chapter)](../security/index.md).

///

## Dependencies errors and return values { #dependencies-errors-and-return-values }

You can use the same dependency *functions* you use normally.

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Testing utilities for use in tests of {@code com.google.common.escape}.
 *
 * <p>This package is a part of the open-source <a href="https://github.com/google/guava">Guava</a>
 * library.
 */
@CheckReturnValue

 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

/**
 * Utilities for reflection. This package is a part of the open-source <a
 * href="https://github.com/google/guava">Guava</a> library.
 */
@CheckReturnValue
@NullMarked
package com.google.common.reflect;

import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.junit.jupiter.MockitoExtension;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Base test class providing common test infrastructure and utilities.
 * All test classes should extend this to ensure consistent test setup.
 */
@ExtendWith(MockitoExtension.class)
public abstract class BaseTest {

    protected final Logger logger = LoggerFactory.getLogger(getClass());

/**
 * Determines a true or false value for a given input; a pre-Java-8 version of {@link
 * java.util.function.Predicate java.util.function.Predicate}.
 *
 * <p>The {@link Predicates} class provides common predicates and related utilities.
 *
 * <p>See the Guava User Guide article on <a
 * href="https://github.com/google/guava/wiki/FunctionalExplained">the use of {@code Predicate}</a>.
 *
 * <h3>For Java 8+ users</h3>
 *

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeoutException;
import org.jspecify.annotations.NullMarked;

/**
 * Testing utilities relating to garbage collection finalization.
 *
 * <p>Use this class to test code triggered by finalization, that is, one of the following
 * actions taken by the java garbage collection system:
 *
 * <ul>