O `TestClient` é baseado no <a href="https://www.python-httpx.org" class="external-link" target="_blank">HTTPX</a>, e felizmente nós podemos utilizá-lo diretamente para testar a API.

## Exemplo

Para um exemplos simples, vamos considerar uma estrutura de arquivos semelhante ao descrito em [Bigger Applications](../tutorial/bigger-applications.md){.internal-link target=_blank} e [Testing](../tutorial/testing.md){.internal-link target=_blank}:

```
.
├── app

if "%unit%" == "k" goto kilo
if "%unit%" == "K" goto kilo
if "%unit%" == "m" goto mega
if "%unit%" == "M" goto mega
if "%unit%" == "g" goto giga
if "%unit%" == "G" goto giga

rem no unit found, must be bytes; consider the whole value
set conv=%value%
rem convert to KB
set /a conv=%conv% / 1024
:kilo
rem convert to MB
set /a conv=%conv% / 1024
goto mega
:giga
rem convert to MB
set /a conv=%conv% * 1024

            /*
             * StandardDescendingMap uses lowerEntry(), and TreeMap.lowerEntry() deliberately
             * produces immutable entries.
             *
             * TODO(cpovirk): Consider making StandardDescendingMap return a ForwardingEntry that
             * supports setValue().
             */
            .suppressing(
                MapEntrySetTester.getSetValueMethod(),

	// This will also flush the ring buffer if used.
	err := b.iow.Close()

	// Wait for all data to be written before returning else it causes race conditions.
	// Race condition is because of io.PipeWriter implementation. i.e consider the following
	// sequent of operations:
	// 1) pipe.Write()
	// 2) pipe.Close()
	// Now pipe.Close() can return before the data is read on the other end of the pipe and written to the disk

        }
      }
    }
  }

  @SuppressWarnings({
    "Interruption", // We are restoring an interrupt on this thread.
    "ThreadPriorityCheck", // TODO: b/175898629 - Consider onSpinWait.
  })
  private void waitForInterrupt(Thread currentThread) {
    /*
     * If someone called cancel(true), it is possible that the interrupted bit hasn't been set yet.

 *
 * <p>If no backing thread factory is provided, a default backing thread factory is used as if by
 * calling {@code setThreadFactory(}{@link Executors#defaultThreadFactory()}{@code )}.
 *
 * <p><b>Java 21+ users:</b> consider using the {@code Thread.Builder} interface instead. E.g.,
 * instead of {@code new ThreadFactoryBuilder().setPriority(priority).setDaemon(false).build()}, use
 * {@code Thread.ofPlatform().priority(priority).daemon(false).factory()}.

@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public abstract class AbstractMultisetSetCountTester<E> extends AbstractMultisetTester<E> {
  /*
   * TODO: consider adding MultisetFeatures.SUPPORTS_SET_COUNT. Currently we
   * assume that using setCount() to increase the count is permitted iff add()
   * is permitted and similarly for decrease/remove(). We assume that a

                        } else {
                            result = -1;
                        }
                    }
                    if (result == 0) {
                        // We don't consider the version range in the comparison, just the resolved version
                        result = new DefaultArtifactVersion(version)
                                .compareTo(new DefaultArtifactVersion(a.getVersion()));

/**
 * An OkHttp EventListener, which logs call events. Can be applied as an
 * [event listener factory][OkHttpClient.eventListenerFactory].
 *
 * The format of the logs created by this class should not be considered stable and may change
 * slightly between releases. If you need a stable logging format, use your own event listener.
 */
class LoggingEventListener private constructor(
  private val logger: HttpLoggingInterceptor.Logger,

     *
     * @return a hash code value for this request
     */
    @Override
    int hashCode();

    /**
     * Returns {@code true} if the specified object is equal to this request.
     * Two requests are considered equal if they have the same type and all
     * significant fields are equal.
     *
     * @param obj the object to compare with this request
     * @return {@code true} if the objects are equal, {@code false} otherwise