threads[1].join();

        // Verify no exceptions occurred (the main goal is no ConcurrentModificationException)
        assertNull(exceptions[0], "Add thread threw exception");
        assertNull(exceptions[1], "Clear thread threw exception");
    }

    /**
     * Test iteration over deleteUrlList while synchronized.
     * This simulates what happens in deleteDocuments() method.
     */
    @Test

            thread.join();
        }

        // Verify no exceptions occurred
        for (int i = 0; i < threadCount; i++) {
            assertNull(exceptions[i], "Thread " + i + " threw exception");
        }

        // Verify alive is false
        assertFalse("alive should be false after all stop() calls", dataStore.alive);
    }

    /**

    assertThat(expected)
        .hasMessageThat()
        .isEqualTo("I bet you didn't think Thread.interrupt could throw");
    /*
     * We need to wait for the runner to exit. It used to be that the runner would get stuck in the
     * busy loop when interrupt threw.
     *
     * While we're at it, we confirm that the interrupt happened as expected.
     */
    ExecutionException fromRunInterruptibly =

    assertThat(expected)
        .hasMessageThat()
        .isEqualTo("I bet you didn't think Thread.interrupt could throw");
    /*
     * We need to wait for the runner to exit. It used to be that the runner would get stuck in the
     * busy loop when interrupt threw.
     *
     * While we're at it, we confirm that the interrupt happened as expected.
     */
    ExecutionException fromRunInterruptibly =

   *   <li>To get uninterruptibility and remove checked exceptions, use {@link
   *       Futures#getUnchecked}.
   * </ul>
   *
   * @throws ExecutionException if the computation threw an exception
   * @throws CancellationException if the computation was cancelled
   */
  @CanIgnoreReturnValue
  @ParametricNullness
  public static <V extends @Nullable Object> V getUninterruptibly(Future<V> future)

    } catch (PermittedMetaException e) {
      referenceException = e;
    } catch (UnknownElementException e) {
      throw new AssertionError(e);
    }

    if (referenceException == null) {
      if (targetException != null) {
        throw new AssertionError("Target threw exception when reference did not", targetException);
      }

      /*

        .matches(
            // J2kt nested class name does not use "$"
            "boiler <com\\.google\\.common\\.base\\.StringsTest[.$]ThrowsOnToString@[0-9a-f]+ "
                + "threw java\\.lang\\.UnsupportedOperationException> plate");
  }

  public void testLenientFormat_badArgumentToString_gwtFriendly() {
    assertThat(Strings.lenientFormat("boiler %s plate", new ThrowsOnToString()))

    } catch (PermittedMetaException e) {
      referenceException = e;
    } catch (UnknownElementException e) {
      throw new AssertionError(e);
    }

    if (referenceException == null) {
      if (targetException != null) {
        throw new AssertionError("Target threw exception when reference did not", targetException);
      }

      /*

    try {
      Thread.class.getMethod("stop").invoke(this);
      join();
    } catch (ReflectiveOperationException e) {
      // stop() threw or did not exist. Don't join() the thread, which might hang forever.
    }

    if (uncaughtThrowable != null) {
      throw new AssertionError("Uncaught throwable in " + getName(), uncaughtThrowable);
    }
  }

  /**

        .matches(
            // J2kt nested class name does not use "$"
            "boiler <com\\.google\\.common\\.base\\.StringsTest[.$]ThrowsOnToString@[0-9a-f]+ "
                + "threw java\\.lang\\.UnsupportedOperationException> plate");
  }

  public void testLenientFormat_badArgumentToString_gwtFriendly() {
    assertThat(Strings.lenientFormat("boiler %s plate", new ThrowsOnToString()))