* Function<A, B> or who call convertAll (and for any checkers that apply @PolyNull-like semantics
   * to Converter.convert). So maybe we don't want to think too hard about how to prevent our
   * checkers from issuing errors related to LegacyConverter, since it turns out that
   * LegacyConverter does violate the assumptions we make elsewhere.
   */

  private @Nullable B unsafeDoForward(@Nullable A a) {

    repeatedlyInterruptTestThread(tearDownStack);
    latch.awaitUnsuccessfully(70);
    assertInterrupted();
  }

  // Condition.await() tests

  /*
   * RE: the WaitNotInLoop warnings:
   *
   * Our tests for awaitUninterruptibly are written under the assumption that no spurious wakeups
   * occur except for those produced by awaitUninterruptibly itself in response to interrupts.
   *

                 * the map to change between that call and this one. But if that happens, the
                 * behavior is undefined because of the concurrent mutation.)
                 *
                 * (Our prototype checker happens to be "smart" enough to understand this for the
                 * *get* call in getValue but not for the *put* call here.)
                 *

      .containsExactly(
        CallStart::class,
        CacheHit::class,
        FollowUpDecision::class,
        CallEnd::class,
      )
  }

  /** Make sure we didn't mess up our special case for [EventListener.NONE]. */
  @Test
  fun eventListenerPlusNoneAggregation() {
    val a = EventRecorder(enforceOrder = false)
    val aPlusNone = a.eventListener + EventListener.NONE

        existingValue == null,
        "Duplicate key: (row=%s, column=%s), values: [%s, %s].",
        rowKey,
        columnKey,
        newValue,
        existingValue);
  }

  // redeclare to satisfy our test for b/310253115
  @Override
  @J2ktIncompatible
  @GwtIncompatible
    abstract Object writeReplace();

  // Only in this class, VALUES must be strictly ascending
  private static final byte[] VALUES = {LEAST, 127, (byte) 128, (byte) 129, GREATEST};

  @SuppressWarnings("InlineMeInliner") // We need to test our method.
  public void testToInt() {
    assertThat(UnsignedBytes.toInt((byte) 0)).isEqualTo(0);
    assertThat(UnsignedBytes.toInt((byte) 1)).isEqualTo(1);
    assertThat(UnsignedBytes.toInt((byte) 127)).isEqualTo(127);

 * <p>If you are using Java 8+, this class is now obsolete. Most of its functionality is now
 * provided by {@link java.util.stream.Stream Stream} and by {@link Comparator} itself, and the rest
 * can now be found as static methods in our new {@link Comparators} class. See each method below
 * for further instructions. Whenever possible, you should change any references of type {@code

    @interface NotTesterAnnotation {
      ExampleFeature[] value() default {};

      ExampleFeature[] absent() default {};
    }
  }

  public void testTestFeatureEnums() {
    // Haha! Let's test our own test rig!
    assertGoodFeatureEnum(ExampleFeature.class);
  }

  public void testAddImpliedFeatures_returnsSameSetInstance() {
    Set<Feature<?>> features = newHashSet(FOO);

  }

  /**
   * Test to ensure we don't  throw a read timeout on responses that are progressing.  For this
   * case, we take a 4KiB body and throttle it to 1KiB/second.  We set the read timeout to two
   * seconds.  If our implementation is acting correctly, it will not throw, as it is progressing.
   */
  @Test
  fun readTimeoutMoreGranularThanBodySize() {
    val body = CharArray(4096) // 4KiB to read.
    Arrays.fill(body, 'y')

        // The real getDocumentCount returns -1 on error; our test double tracks this
        testClient.documentCountError = true;
        final long count = testClient.getDocumentCount("nonexistent_index");
        assertEquals(-1L, count);
    }

    @Test
    public void test_getAliasCount_returnsZeroOnError() {
        // The real getAliasCount returns 0 on error; our test double tracks this