Class<T> interfaceType, Method method, Function<? super T, ? extends T> wrapperFunction) {
    new InteractionTester<T>(interfaceType, method).testInteraction(wrapperFunction);
  }

  private static <T> void testExceptionPropagation(
      Class<T> interfaceType, Method method, Function<? super T, ? extends T> wrapperFunction) {
    RuntimeException exception = new RuntimeException();
    T proxy =

    result.usingGenerator(generator);
    return result;
  }

  @SuppressWarnings("rawtypes") // class literals
  @Override
  protected List<Class<? extends AbstractTester>> getTesters() {
    List<Class<? extends AbstractTester>> testers = copyToList(super.getTesters());
    testers.addAll(ConcurrentMapTestSuiteBuilder.TESTERS);
    return testers;
  }

  @Override

 *
 * @param <O> The specific Options type this request carries
 *
 * @since 4.0.0
 */
@Experimental
public interface MavenInvokerRequest<O extends MavenOptions> extends InvokerRequest<O> {
    // This interface doesn't declare any additional methods beyond those inherited from InvokerRequest.
    // It serves to type-specify the Options as MavenOptions for Maven-specific requests.

        }
        return indexName;
    }

    @Override
    protected <RESULT extends Group> RESULT createEntity(final Map<String, Object> source, final Class<? extends RESULT> entityType) {
        try {
            final RESULT result = entityType.newInstance();
            result.setName(DfTypeUtil.toString(source.get("name")));

 */
@GwtIncompatible
public class SetTestSuiteBuilder<E>
    extends AbstractCollectionTestSuiteBuilder<SetTestSuiteBuilder<E>, E> {
  public static <E> SetTestSuiteBuilder<E> using(TestSetGenerator<E> generator) {
    return new SetTestSuiteBuilder<E>().usingGenerator(generator);
  }

  @SuppressWarnings("rawtypes") // class literals
  @Override
  protected List<Class<? extends AbstractTester>> getTesters() {

    runCollectionTests = false;
    return this;
  }

  @SuppressWarnings("rawtypes") // class literals
  @Override
  protected List<Class<? extends AbstractTester>> getTesters() {
    List<Class<? extends AbstractTester>> testers = new ArrayList<>();
    if (runCollectionTests) {
      testers.addAll(super.getTesters());
    }

    testers.add(QueueElementTester.class);

    public static final class InMemoryPrintStream extends PrintStream {
      public InMemoryPrintStream() {
        super(new ByteArrayOutputStream());
      }
    }

    public static final class InMemoryPrintWriter extends PrintWriter {
      public InMemoryPrintWriter() {
        super(new StringWriter());
      }
    }

    public static final class DeterministicRandom extends Random {
      @Keep

 *
 * @param <R> The specific type of {@link InvokerRequest} this {@code Invoker} can handle, extending {@link InvokerRequest}
 *
 * @since 4.0.0
 */
@Experimental
public interface Invoker<R extends InvokerRequest<? extends Options>> extends AutoCloseable {
    /**
     * Invokes the Maven application using the provided {@link InvokerRequest}.
     * This method is responsible for executing the Maven command or build

```Python hl_lines="3"
{!../../docs_src/app_testing/test_main.py!}
```

...and have the code for the tests just like before.

## Testing: extended example

Now let's extend this example and add more details to see how to test different parts.

### Extended **FastAPI** app file

Let's continue with the same file structure as before:

```
.
├── app
│   ├── __init__.py
│   ├── main.py

/**
 * Creates sets, containing sample elements, to be tested.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public interface TestListGenerator<E extends @Nullable Object> extends TestCollectionGenerator<E> {
  @Override
  List<E> create(Object... elements);