assertEquals("com", InternetDomainName.from("google.com").parent().toString());
    assertEquals("uk", InternetDomainName.from("co.uk").parent().toString());
    assertEquals("google.com", InternetDomainName.from("www.google.com").parent().toString());

    try {
      InternetDomainName.from("com").parent();
      fail("'com' should throw ISE on .parent() call");
    } catch (IllegalStateException expected) {
    }
  }

  <!-- do_not_remove: published-with-gradle-metadata -->
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.google.guava</groupId>
    <artifactId>guava-parent</artifactId>
    <version>HEAD-jre-SNAPSHOT</version>
  </parent>
  <artifactId>guava</artifactId>
  <packaging>bundle</packaging>
  <name>Guava: Google Core Libraries for Java</name>

    Path file = root().resolve("parent/nonexistent.file");
    Path parent = file.getParent();
    assertFalse(Files.exists(parent));
    assertThrows(IOException.class, () -> MoreFiles.createParentDirectories(file));
  }

  public void testCreateParentDirectories_nonDirectoryParentExists() throws IOException {
    Path parent = createTempFile();
    assertTrue(Files.isRegularFile(parent));
    Path file = parent.resolve("foo");

    assertEquals("com", InternetDomainName.from("google.com").parent().toString());
    assertEquals("uk", InternetDomainName.from("co.uk").parent().toString());
    assertEquals("google.com", InternetDomainName.from("www.google.com").parent().toString());

    try {
      InternetDomainName.from("com").parent();
      fail("'com' should throw ISE on .parent() call");
    } catch (IllegalStateException expected) {
    }
  }

      // Bubble up max levels.
      E parent;
      // If toTrickle is moved up to a parent of removeIndex, the parent is
      // placed in removeIndex position. We must return that to the iterator so
      // that it knows to skip it.
      if (crossOver < removeIndex) {
        // We crossed over to the parent level in crossOver, so the parent
        // has already been moved.
        parent = elementData(removeIndex);
      } else {

 *
 * <ul>
 *   <li><a target="_parent"
 *       href="http://en.wikipedia.org/wiki/Bogon_filtering">http://en.wikipedia.
 *       org/wiki/Bogon_filtering</a>
 *   <li><a target="_parent"
 *       href="http://www.cymru.com/Bogons/ipv6.txt">http://www.cymru.com/Bogons/ ipv6.txt</a>
 *   <li><a target="_parent" href="http://www.cymru.com/Bogons/v6bogon.html">http://www.cymru.com/

    testers.add(SetEqualsTester.class);
    testers.add(SetRemoveTester.class);
    // SetRemoveAllTester doesn't exist because, Sets not permitting
    // duplicate elements, there are no tests for Set.removeAll() that aren't
    // covered by CollectionRemoveAllTester.
    return testers;
  }

  @Override
  protected List<TestSuite> createDerivedSuites(

    Method[] methods = getMostConcreteMethods(interfaceType);
    AccessibleObject.setAccessible(methods, true);
    for (Method method : methods) {
      // Under java 8, interfaces can have default methods that aren't abstract.
      // No need to verify them.
      // Can't check isDefault() for JDK 7 compatibility.
      if (!Modifier.isAbstract(method.getModifiers())) {
        continue;
      }

    Method[] methods = getMostConcreteMethods(interfaceType);
    AccessibleObject.setAccessible(methods, true);
    for (Method method : methods) {
      // Under java 8, interfaces can have default methods that aren't abstract.
      // No need to verify them.
      // Can't check isDefault() for JDK 7 compatibility.
      if (!Modifier.isAbstract(method.getModifiers())) {
        continue;
      }

        return;
      }

      /*
       * Almost everything in GWT is an AbstractFuture (which is as good as TrustedFuture under
       * GWT). But ImmediateFuture and UncheckedThrowingFuture aren't, so we still need this case.
       */
      try {
        forceSet(getDone(delegate));
      } catch (ExecutionException exception) {
        forceSetException(exception.getCause());