Exception cause = new IllegalArgumentException("Root cause");
        CrawlerSystemException exception = new CrawlerSystemException(cause);

        assertNotNull(exception);
        assertSame(cause, exception.getCause());
        // When constructed with cause only, message should be cause's toString()
        assertEquals("java.lang.IllegalArgumentException: Root cause", exception.getMessage());
    }

  }

  public void testPreconditions() {
    assertThrows(
        IllegalArgumentException.class,
        () -> BloomFilter.create(Funnels.unencodedCharsFunnel(), -1));
    assertThrows(
        IllegalArgumentException.class,
        () -> BloomFilter.create(Funnels.unencodedCharsFunnel(), -1, 0.03));
    assertThrows(
        IllegalArgumentException.class,
        () -> BloomFilter.create(Funnels.unencodedCharsFunnel(), 1, 0.0));

              e -> e instanceof ConcurrentModificationException)
          .put(ExecutionException.class, e -> e instanceof ExecutionException)
          .put(IllegalArgumentException.class, e -> e instanceof IllegalArgumentException)
          .put(IllegalStateException.class, e -> e instanceof IllegalStateException)
          .put(IndexOutOfBoundsException.class, e -> e instanceof IndexOutOfBoundsException)

              e -> e instanceof ConcurrentModificationException)
          .put(ExecutionException.class, e -> e instanceof ExecutionException)
          .put(IllegalArgumentException.class, e -> e instanceof IllegalArgumentException)
          .put(IllegalStateException.class, e -> e instanceof IllegalStateException)
          .put(IndexOutOfBoundsException.class, e -> e instanceof IndexOutOfBoundsException)

  private static Class<? extends Annotation> asAnnotation(Class<?> clazz) {
    if (clazz.isAnnotation()) {
      return (Class<? extends Annotation>) clazz;
    } else {
      throw new IllegalArgumentException(rootLocaleFormat("%s is not an annotation.", clazz));
    }
  }

  public void testFeatureEnums() throws Exception {
    assertGoodFeatureEnum(CollectionFeature.class);

  public void testInvalidIntRange() {
    assertThrows(IllegalArgumentException.class, () -> ContiguousSet.closed(2, 1));
    assertThrows(IllegalArgumentException.class, () -> ContiguousSet.closedOpen(2, 1));
  }

  public void testInvalidLongRange() {
    assertThrows(IllegalArgumentException.class, () -> ContiguousSet.closed(2L, 1L));
    assertThrows(IllegalArgumentException.class, () -> ContiguousSet.closedOpen(2L, 1L));
  }

    assertThrows(IllegalArgumentException.class, () -> HashCode.fromString(""));
    assertThrows(IllegalArgumentException.class, () -> HashCode.fromString("7"));
    HashCode unused = HashCode.fromString("7f");
  }

  public void testFromStringFailsWithOddLengthInput() {
    assertThrows(IllegalArgumentException.class, () -> HashCode.fromString("7f8"));
  }

  public void testIntWriteBytesTo() {
    byte[] dest = new byte[4];

  public void testTruncateIllegalArguments() {
    assertThrows(IllegalArgumentException.class, () -> Ascii.truncate("foobar", 2, "..."));

    assertThrows(IllegalArgumentException.class, () -> Ascii.truncate("foobar", 8, "1234567890"));

    assertThrows(IllegalArgumentException.class, () -> Ascii.truncate("foobar", -1, "..."));

    assertThrows(IllegalArgumentException.class, () -> Ascii.truncate("foobar", -1, ""));
  }

  public void testTruncateIllegalArguments() {
    assertThrows(IllegalArgumentException.class, () -> Ascii.truncate("foobar", 2, "..."));

    assertThrows(IllegalArgumentException.class, () -> Ascii.truncate("foobar", 8, "1234567890"));

    assertThrows(IllegalArgumentException.class, () -> Ascii.truncate("foobar", -1, "..."));

    assertThrows(IllegalArgumentException.class, () -> Ascii.truncate("foobar", -1, ""));
  }

          .put(ExecutionError.class, e -> e instanceof ExecutionError)
          .put(ExecutionException.class, e -> e instanceof ExecutionException)
          .put(IllegalArgumentException.class, e -> e instanceof IllegalArgumentException)
          .put(IllegalStateException.class, e -> e instanceof IllegalStateException)
          .put(IndexOutOfBoundsException.class, e -> e instanceof IndexOutOfBoundsException)