.add("field2", "Googley")
            .omitNullValues()
            .add("field3", "World")
            .toString();
    assertEquals("TestClass{field1=Hello, field2=Googley, field3=World}", toTest);
  }

  public void testToStringHelperWithArrays() {
    String[] strings = {"hello", "world"};
    int[] ints = {2, 42};
    Object[] objects = {"obj"};
    String[] arrayWithNull = {null};

    mac.init(SHA1_KEY);
    mac.update("hello".getBytes(UTF_8));
    mac.update("world".getBytes(UTF_8));

    assertEquals(
        HashCode.fromBytes(mac.doFinal()),
        Hashing.hmacSha1(SHA1_KEY)
            .newHasher()
            .putString("hello", UTF_8)
            .putString("world", UTF_8)
            .hash());
  }

  public void testMultipleUpdatesDoFinal() throws Exception {

          .put("empty", "")
          .put("1 char", "0")
          .put("1 word", "hello")
          .put("2 words", "hello world")
          .put("\\n line break", "hello\nworld")
          .put("\\r line break", "hello\rworld")
          .put("\\r\\n line break", "hello\r\nworld")
          .put("\\n at EOF", "hello\nworld\n")
          .put("\\r at EOF", "hello\nworld\r")
          .put("lorem ipsum", LOREM_IPSUM)
          .buildOrThrow();

            .add("field2", "Googley")
            .omitNullValues()
            .add("field3", "World")
            .toString();
    assertEquals("TestClass{field1=Hello, field2=Googley, field3=World}", toTest);
  }

  public void testToStringHelperWithArrays() {
    String[] strings = {"hello", "world"};
    int[] ints = {2, 42};
    Object[] objects = {"obj"};
    String[] arrayWithNull = {null};

    mac.init(SHA1_KEY);
    mac.update("hello".getBytes(UTF_8));
    mac.update("world".getBytes(UTF_8));

    assertEquals(
        HashCode.fromBytes(mac.doFinal()),
        Hashing.hmacSha1(SHA1_KEY)
            .newHasher()
            .putString("hello", UTF_8)
            .putString("world", UTF_8)
            .hash());
  }

  public void testMultipleUpdatesDoFinal() throws Exception {

    assertEquals("Hello, World!", builder.toString());
  }

  public void testAppendMethods() throws IOException {
    StringBuilder builder = new StringBuilder();
    Writer writer = new AppendableWriter(builder);

    writer.append("Hello,");
    writer.append(' ');
    writer.append("The World Wide Web", 4, 9);
    writer.append("!");

    assertEquals("Hello, World!", builder.toString());
  }

    w.println("hello");
    w.println("");
    w.println(" world  ");
    w.println("");
    w.close();

    assertEquals("hello", Files.readFirstLine(temp, Charsets.UTF_8));
    assertEquals(
        ImmutableList.of("hello", "", " world  ", ""), Files.readLines(temp, Charsets.UTF_8));

    assertTrue(temp.delete());
  }

  public void testWrap() {
    new EqualsTester()
        .addEqualityGroup(
            LENGTH_EQUIVALENCE.wrap("hello"),
            LENGTH_EQUIVALENCE.wrap("hello"),
            LENGTH_EQUIVALENCE.wrap("world"))
        .addEqualityGroup(LENGTH_EQUIVALENCE.wrap("hi"), LENGTH_EQUIVALENCE.wrap("yo"))
        .addEqualityGroup(
            LENGTH_EQUIVALENCE.<@Nullable String>wrap(null),

    assertEquals(TypeToken.of(String.class), invokable.getParameters().get(1).getType());
  }

  public void testAnonymousClassDefaultConstructor() {
    final int i = 1;
    final String s = "hello world";
    Class<?> anonymous =
        new Runnable() {
          @Override
          public void run() {
            System.out.println(s + i);
          }
        }.getClass();

    w.println("hello");
    w.println("");
    w.println(" world  ");
    w.println("");
    w.close();

    assertEquals("hello", Files.readFirstLine(temp, Charsets.UTF_8));
    assertEquals(
        ImmutableList.of("hello", "", " world  ", ""), Files.readLines(temp, Charsets.UTF_8));

    assertTrue(temp.delete());
  }