fail("Expected NullPointerException or UnsupportedOperationException");
    } catch (NullPointerException | UnsupportedOperationException expected) {
    }
  }

  public void testMergeNullFunction() {
    try {
      getMap().merge(k0(), v3(), null);
      fail("Expected NullPointerException or UnsupportedOperationException");
    } catch (NullPointerException | UnsupportedOperationException expected) {
    }
  }

    try {
      presentAsSet.add("b");
      fail();
    } catch (UnsupportedOperationException expected) {
    }
  }

  public void testAsSet_absentIsImmutable() {
    Set<Object> absentAsSet = Optional.absent().asSet();
    try {
      absentAsSet.add("foo");
      fail();
    } catch (UnsupportedOperationException expected) {
    }
  }

  public void testTransform_absent() {

          if (otherElement == null || unsafeCompare(element, otherElement) != 0) {
            return false;
          }
        }
        return true;
      } catch (ClassCastException e) {
        return false;
      } catch (NoSuchElementException e) {
        return false; // concurrent change to other set
      }
    }
    return containsAll(that);
  }

  @Override
  public E first() {

    try {
      Ascii.truncate("foobar", 2, "...");
      fail();
    } catch (IllegalArgumentException expected) {
    }

    try {
      Ascii.truncate("foobar", 8, "1234567890");
      fail();
    } catch (IllegalArgumentException expected) {
    }

    try {
      Ascii.truncate("foobar", -1, "...");
      fail();
    } catch (IllegalArgumentException expected) {
    }

    try {

      fail();
    } catch (IllegalStateException expected) {
    }
  }

  public void testBase64CannotLowerCase() {
    try {
      base64().lowerCase();
      fail();
    } catch (IllegalStateException expected) {
    }
  }

  public void testBase64CannotIgnoreCase() {
    try {
      base64().ignoreCase();
      fail();
    } catch (IllegalStateException expected) {
    }

    try {
      Iterator<E> iterator = collection.iterator();
      assertTrue(collection.removeIf(Predicate.isEqual(samples.e0())));
      iterator.next();
      fail("Expected ConcurrentModificationException");
    } catch (ConcurrentModificationException expected) {
      // success
    }
  }

  @CollectionFeature.Require(absent = SUPPORTS_REMOVE)
  @CollectionSize.Require(ZERO)
  public void testRemoveIf_unsupportedEmptyCollection() {

      } catch (Exception ex) {
        throw new Error(ex);
      }
    }

    /** TODO(lukes): This was copied verbatim from Striped64.java... standardize this? */
    private static sun.misc.Unsafe getUnsafe() {
      try {
        return sun.misc.Unsafe.getUnsafe();
      } catch (SecurityException tryReflectionInstead) {
      }
      try {

      fail("expected to be interrupted");
    } catch (InterruptedException expected) {
    } catch (TimeoutException e) {
      throw new RuntimeException(e);
    }

    // we were interrupted, but it's been cleared now
    assertFalse(Thread.interrupted());

    assertFalse(sleeper.completed);
    try {
      assertTrue(delayedFuture.get());
    } catch (InterruptedException e) {

      stopwatch.start();
      fail();
    } catch (IllegalStateException expected) {
    }
    assertTrue(stopwatch.isRunning());
  }

  public void testStop() {
    stopwatch.start();
    assertSame(stopwatch, stopwatch.stop());
    assertFalse(stopwatch.isRunning());
  }

  public void testStop_new() {
    try {
      stopwatch.stop();
      fail();
    } catch (IllegalStateException expected) {
    }

   */
  public static void close(@CheckForNull Closeable closeable, boolean swallowIOException)
      throws IOException {
    if (closeable == null) {
      return;
    }
    try {
      closeable.close();
    } catch (IOException e) {
      if (swallowIOException) {
        logger.log(Level.WARNING, "IOException thrown while closing Closeable.", e);
      } else {
        throw e;
      }
    }
  }

  /**