assertFalse(
        Visibility.PUBLIC.isVisible(VisibilityMethods.class.getDeclaredMethod("privateMethod")));
    assertFalse(
        Visibility.PUBLIC.isVisible(
            VisibilityMethods.class.getDeclaredMethod("packagePrivateMethod")));
    assertFalse(
        Visibility.PUBLIC.isVisible(VisibilityMethods.class.getDeclaredMethod("protectedMethod")));
    assertTrue(

    PACKAGE {
      @Override
      boolean isVisible(int modifiers) {
        return !Modifier.isPrivate(modifiers);
      }
    },

    PROTECTED {
      @Override
      boolean isVisible(int modifiers) {
        return Modifier.isPublic(modifiers) || Modifier.isProtected(modifiers);
      }
    },

    PUBLIC {
      @Override
      boolean isVisible(int modifiers) {

  private final ClassSanityTester tester = new ClassSanityTester();
  private Visibility visibility = Visibility.PACKAGE;
  private Predicate<Class<?>> classFilter =
      (Class<?> cls) -> visibility.isVisible(cls.getModifiers());

  /**
   * Restricts the sanity tests for public API only. By default, package-private API are also
   * covered.
   */
  protected final void publicApiOnly() {

   * @since 19.0 (since 1.0 as constant {@code INVISIBLE})
   */
  @Deprecated
  public static CharMatcher invisible() {
    return Invisible.INSTANCE;
  }

  /**
   * Determines whether a character is single-width (not double-width). When in doubt, this matcher
   * errs on the side of returning {@code false} (that is, it tends to assume a character is
   * double-width).
   *

    }.also { expected ->
      assertThat(expected).hasMessage("expected at least 1 part")
    }
  }

  @Test fun `skip preamble`() {
    val multipart =
      """
      |this is the preamble! it is invisible to application code
      |
      |--simple boundary
      |
      |abcd
      |--simple boundary--
      """.trimMargin()
        .replace("\n", "\r\n")

    val parts =
      MultipartReader(

    val array = CharArray(count)
    Arrays.fill(array, c)
    return String(array)
  }

  /**
   * Okio buffers are internally implemented as a linked list of arrays. Usually this implementation
   * detail is invisible to the caller, but subtle use of certain APIs may depend on these internal
   * structures.
   *
   * We make such subtle calls in [okhttp3.internal.ws.MessageInflater] because we try to read a

    doTestSetBits(inRange('n', 'q'));
    doTestSetBits(forPredicate(Predicates.equalTo('c')));
    doTestSetBits(CharMatcher.ascii());
    doTestSetBits(CharMatcher.digit());
    doTestSetBits(CharMatcher.invisible());
    doTestSetBits(CharMatcher.whitespace());
    doTestSetBits(inRange('A', 'Z').and(inRange('F', 'K').negate()));
  }

  @GwtIncompatible // java.util.BitSet
  private void doTestSetBits(CharMatcher matcher) {

    doTestSetBits(inRange('n', 'q'));
    doTestSetBits(forPredicate(Predicates.equalTo('c')));
    doTestSetBits(CharMatcher.ascii());
    doTestSetBits(CharMatcher.digit());
    doTestSetBits(CharMatcher.invisible());
    doTestSetBits(CharMatcher.whitespace());
    doTestSetBits(inRange('A', 'Z').and(inRange('F', 'K').negate()));
  }

  @GwtIncompatible // java.util.BitSet
  private void doTestSetBits(CharMatcher matcher) {