assertEquals("", is('a').retainFrom(""));
  }

  public void testPrecomputedOptimizations() {
    // These are testing behavior that's never promised by the API.
    // Some matchers are so efficient that it is a waste of effort to
    // build a precomputed version.
    CharMatcher m1 = is('x');
    assertSame(m1, m1.precomputed());
    assertEquals(m1.toString(), m1.precomputed().toString());

        // The provider's toString might not contain the exact class name
        // Just verify it's not null and contains some meaningful info
        assertTrue("toString should not be empty", toString.length() > 0);
    }

    public void test_hook_withNullAssistantDirector() {
        // When & Then - Should not throw exception

              }
            });

    // Don't copy this into your own test!
    // Use e.g. awaitClear or await(CountDownLatch) instead.
    GcFinalization.awaitFullGc();

    // Attempt to help with some flakiness that we've seen: b/387521512.
    GcFinalization.awaitFullGc();

    assertEquals(0, finalizerRan.getCount());
    assertNull(ref.get());
  }

    // deal with camel conversion
    StringBuilder out = null;
    int i = 0;
    int j = -1;
    while ((j = wordBoundary.indexIn(s, ++j)) != -1) {
      if (i == 0) {
        // include some extra space for separators
        out = new StringBuilder(s.length() + 4 * format.wordSeparator.length());
        out.append(format.normalizeFirstWord(s.substring(i, j)));
      } else {

* Eine beliebige Folge von Argumenten, die der Reihe nach an die Taskfunktion übergeben werden sollen (`email`).
* Alle Schlüsselwort-Argumente, die an die Taskfunktion übergeben werden sollen (`message="some notification"`).

## Dependency Injection

    /**
     * Associates the specified session data with the given key if the key is currently mapped to the given value. This
     * method provides an atomic compare-and-update of some key's value.
     *
     * @param key the key under which to store the session data, must not be {@code null}
     * @param oldValue the expected data currently associated with the key, may be {@code null}

        writeLittleEndianInt(baos, 0); // bufferCount = 0
        writeLittleEndianInt(baos, PacConstants.PAC_VERSION); // valid version
        baos.write(new byte[10]); // Some extra data
        byte[] pacData = baos.toByteArray();

        PACDecodingException e = assertThrows(PACDecodingException.class, () -> new Pac(pacData, keys));
        // Should indicate missing required buffers

In OkHttp some fields of the address come from the URL (scheme, hostname, port) and the rest come from the [OkHttpClient](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-ok-http-client/).

    }
  }

  private static boolean equal(@Nullable Object a, @Nullable Object b) {
    return a == b || (a != null && a.equals(b));
  }

  // This one-liner saves us from some ugly casts
  protected Entry<K, V> entry(K key, V value) {
    return mapEntry(key, value);
  }

  @Override
  protected void expectContents(Collection<Entry<K, V>> expected) {

    void testWithLargeBuffers() {
        // Test with large byte arrays
        byte[] largeRequestBuffer = new byte[1024];
        byte[] largeResponseBuffer = new byte[2048];

        // Fill with some test data
        for (int i = 0; i < largeRequestBuffer.length; i++) {
            largeRequestBuffer[i] = (byte) (i % 256);
        }
        for (int i = 0; i < largeResponseBuffer.length; i++) {