};

    assertEquals(0, loadCount.get());
    assertEquals(0, reloadCount.get());
    assertEquals(0, loadAllCount.get());

    Object unused1 = baseLoader.load(new Object());
    @SuppressWarnings("unused") // https://errorprone.info/bugpattern/FutureReturnValueIgnored
    Future<?> possiblyIgnoredError = baseLoader.reload(new Object(), new Object());
    Map<Object, Object> unused2 = baseLoader.loadAll(ImmutableList.of(new Object()));

    /**
     * Asserts that the expected completion time has passed (and not "too much" time beyond that).
     */
    void assertCompletionExpected() {
      assertAtLeastTimePassed(stopwatch, expectedCompletionWaitMillis);
      assertTimeNotPassed(stopwatch, expectedCompletionWaitMillis + LONG_DELAY_MS);
    }

    /**
     * Asserts that at least {@code timeout} has passed but the expected completion time has not.
     */

    }

    protected FessCookieResourceProvider createCookieResourceProvider() { // #change_it_first
        final InvertibleCryptographer cr = InvertibleCryptographer.createAesCipher("*unused@");
        return new FessCookieResourceProvider(fessConfig, cr);
    }

    protected FessActionAdjustmentProvider createActionAdjustmentProvider() {
        return new FessActionAdjustmentProvider(fessConfig);

            .build();

    cache.put(key, "1");
    // simultaneous load and deletion
    doParallelCacheOp(
        count,
        n -> {
          try {
            String unused = cache.get(key, () -> key);
            cache.asMap().compute(key, (k, v) -> null);
          } catch (ExecutionException e) {
            throw new UncheckedExecutionException(e);
          }
        });

  interface ConcurrentlyMutatedList<E> extends List<E> {
    /**
     * The elements of a {@link ConcurrentlyMutatedList} are added and removed over time. This
     * method returns every state that the list has passed through at some point.
     */
    Set<List<E>> getAllStates();
  }

  /**
   * Returns a {@link ConcurrentlyMutatedList} that performs the given operations as its concurrent

app = FastAPI()

app.add_middleware(UnicornMiddleware, some_config="rainbow")
```

`app.add_middleware()` receives a middleware class as the first argument and any additional arguments to be passed to the middleware.

## Integrated middlewares { #integrated-middlewares }

**FastAPI** includes several middlewares for common use cases, we'll see next how to use them.

/// note | Technical Details

    public void test_constructor_withCause() {
        // Test constructor with cause only
        Throwable cause = new IllegalStateException("Container initialization failed");
        ContainerNotAvailableException exception = new ContainerNotAvailableException(cause);

        assertEquals("Container is not available.", exception.getMessage());
        // The cause is not passed to super constructor in the implementation

        EXCEPTION,
        /** Indicates that processing of a URL has finished. */
        FINISHED,
        /** Indicates that content was successfully parsed. */
        PARSED,
        /** Indicates that a URL was prepared for crawling. */
        PREPARED,
        /** Indicates that a URL redirect was encountered. */
        REDIRECTED,

    addEdge(N1, N2, E12);
    IllegalArgumentException e =
        assertThrows(
            IllegalArgumentException.class,
            () -> {
              Set<String> unused = network.edgesConnecting(ENDPOINTS_N1N2);
            });
    assertThat(e).hasMessageThat().contains(ENDPOINTS_MISMATCH);
  }

  @Test
  public void edgeConnectingOrNull_orderMismatch() {

        this(message, -1, -1, cause);
    }

    public ModelParserException(String message, int lineNumber, int columnNumber, Throwable cause) {
        super(message, cause);
        this.lineNumber = lineNumber;
        this.columnNumber = columnNumber;
    }

    public ModelParserException(Throwable cause) {
        this(null, cause);
    }