}
    Object result;
    try {
      result = supplier.get();
    } catch (Throwable t) {
      if (predicate.apply(t)) {
        // We are careful to set up INSTANCE_OF to match each Predicate to its target Class.
        @SuppressWarnings("unchecked")
        T caught = (T) t;
        return caught;
      }
      throw new AssertionError(

   * "plain {@code T}." This API provides that.
   */
  @SuppressWarnings({"nullness", "TypeParameterUnusedInFormals", "ReturnMissingNullable"})
  // The warnings are legitimate. Each time we use this method, we document why.
  @ParametricNullness
  static <T extends @Nullable Object> T uncheckedNull() {
    return null;
  }

  private NullnessCasts() {}

@ExtendWith(MockitoExtension.class)
public class ResponseTest {

    @Mock
    private Response mockResponse;

    @BeforeEach
    void setUp() {
        // Reset mock before each test to ensure clean state
        // MockitoExtension handles this automatically for @Mock fields, but good to be aware.
    }

    @Test
    void testIsReceived() {

///

## **FastAPI** utilities { #fastapi-utilities }

FastAPI provides several tools for each of these security schemes in the `fastapi.security` module that simplify using these security mechanisms.

In the next chapters you will see how to add security to your API using those tools provided by **FastAPI**.

    /*
     * We don't "need" to schedule a thread completion at all here, but by doing
     * so, we come the closest we can to testing that the wait time is
     * appropriately decreased on each progressive join() call.
     */
    TimedThread thread = TimedThread.createWithDelay(LONG_DELAY_MS);
    repeatedlyInterruptTestThread(20, tearDownStack);
    thread.joinUnsuccessfully(70);
    assertInterrupted();

   * plus the given elements, according to {@link #expectContents(java.util.Collection)}. In other
   * words, for the default {@code expectContents()} implementation, the number of occurrences of
   * each given element has increased by one since the test collection was created, and the number
   * of occurrences of all other elements has not changed.
   *

```console
$ pip install websockets

---> 100%
```

</div>

## Cliente WebSockets

### En producción

En tu sistema de producción, probablemente tengas un frontend creado con un framework moderno como React, Vue.js o Angular.

Y para comunicarte usando WebSockets con tu backend probablemente usarías las utilidades de tu frontend.

```console
$ pip install websockets

---> 100%
```

</div>

## WebSockets-Client

### In Produktion

In Ihrem Produktionssystem haben Sie wahrscheinlich ein Frontend, das mit einem modernen Framework wie React, Vue.js oder Angular erstellt wurde.

Und um über WebSockets mit Ihrem Backend zu kommunizieren, würden Sie wahrscheinlich die Werkzeuge Ihres Frontends verwenden.

    assertThrows(IOException.class, () -> reader.reset());
  }

  /**
   * Creates a CharSequenceReader wrapping the given CharSequence and tests that the reader produces
   * the same sequence when read using each type of read method it provides.
   */
  private static void assertReadsCorrectly(CharSequence charSequence) throws IOException {
    String expected = charSequence.toString();

    // read char by char

        dstIndex += 2;

        // Flags (4 bytes)
        SMBUtil.writeInt4(this.flags, dst, dstIndex);
        dstIndex += 4;

        // Compression algorithms (2 bytes each)
        for (int algo : this.compressionAlgorithms) {
            SMBUtil.writeInt2(algo, dst, dstIndex);
            dstIndex += 2;
        }

        return dstIndex - start;
    }

    @Override