bufferHelper(
        "\nempty first line\nno newline at end", "\n", "empty first line\n", "no newline at end");
    bufferHelper("three\rlines\rno newline at end", "three\r", "lines\r", "no newline at end");
    bufferHelper("mixed\nline\rendings\r\n", "mixed\n", "line\r", "endings\r\n");
  }

  private static final int[] CHUNK_SIZES = {1, 2, 3, Integer.MAX_VALUE};

    try {
      builder.add((String) null);
      fail("expected NullPointerException"); // COV_NF_LINE
    } catch (NullPointerException expected) {
    }

    builder = this.<String>builder();
    try {
      builder.add((String[]) null);
      fail("expected NullPointerException"); // COV_NF_LINE
    } catch (NullPointerException expected) {
    }

    builder = this.<String>builder();
    try {

    try {
      builder.add((String) null);
      fail("expected NullPointerException"); // COV_NF_LINE
    } catch (NullPointerException expected) {
    }

    builder = this.<String>builder();
    try {
      builder.add((String[]) null);
      fail("expected NullPointerException"); // COV_NF_LINE
    } catch (NullPointerException expected) {
    }

    builder = this.<String>builder();
    try {

          .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)

  /**
   * Line Feed ('\n'): A format effector which controls the movement of the printing position to the
   * next printing line. (Applicable also to display devices.) Where appropriate, this character may
   * have the meaning "New Line" (NL), a format effector which controls the movement of the printing
   * point to the first printing position on the next printing line. Use of this convention requires

 * representation will be hard to change. Instead, use <a
 * href="http://errorprone.info/bugpattern/RestrictedApi">RestrictedApiChecker</a>, which enforces
 * fine-grained visibility policies.
 *
 * @author Johannes Henkel
 */
@GwtCompatible
public @interface VisibleForTesting {

      return;
    }
    keyToRemove = map.keySet().iterator().next();
    if (supportsRemove) {
      int initialSize = map.size();
      map.get(keyToRemove);
      map.remove(keyToRemove);
      // This line doesn't hold - see the Javadoc comments above.
      // assertEquals(expectedValue, oldValue);
      assertFalse(map.containsKey(keyToRemove));
      assertEquals(initialSize - 1, map.size());
    } else {
      try {

  }

  @SuppressWarnings("unused") // compilation test
  public void testSampleCodeFine1() {
    Optional<Number> optionalInt = Optional.of((Number) 1);
    Number value = optionalInt.or(0.5); // fine
  }

  @SuppressWarnings("unused") // compilation test
  public void testSampleCodeFine2() {
    FluentIterable<? extends Number> numbers = getSomeNumbers();

   * @param pattern the pattern on which to filter file names
   */
  public PatternFilenameFilter(Pattern pattern) {
    this.pattern = Preconditions.checkNotNull(pattern);
  }

  /*
   * Our implementation works fine with a null `dir`. However, there's nothing in the documentation
   * of the supertype that suggests that implementations are expected to tolerate null. That said, I

   *
   * Note that sometimes these fields *do* have correct values under J2CL: They will if the caller
   * calls `create(Foo.class)`, rather than `create(map)`. That's fine; we just shouldn't rely on
   * it.
   */
  transient Class<K> keyTypeOrObjectUnderJ2cl;
  transient Class<V> valueTypeOrObjectUnderJ2cl;

  /**