File temp = createTempFile();
    Files.append(I18N, temp, UTF_16LE);
    assertEquals(I18N, Files.toString(temp, UTF_16LE));
    Files.append(I18N, temp, UTF_16LE);
    assertEquals(I18N + I18N, Files.toString(temp, UTF_16LE));
    Files.append(I18N, temp, UTF_16LE);
    assertEquals(I18N + I18N + I18N, Files.toString(temp, UTF_16LE));
  }

    URL resource = getClass().getResource("testdata/i18n.txt");
    assertEquals(I18N, Resources.toString(resource, UTF_8));
    assertThat(Resources.toString(resource, US_ASCII)).isNotEqualTo(I18N);
  }

  public void testToByteArray() throws IOException {
    URL resource = getClass().getResource("testdata/i18n.txt");
    assertThat(Resources.toByteArray(resource)).isEqualTo(I18N.getBytes(UTF_8));
  }

    File temp = createTempFile();
    Files.append(I18N, temp, UTF_16LE);
    assertEquals(I18N, Files.toString(temp, UTF_16LE));
    Files.append(I18N, temp, UTF_16LE);
    assertEquals(I18N + I18N, Files.toString(temp, UTF_16LE));
    Files.append(I18N, temp, UTF_16LE);
    assertEquals(I18N + I18N + I18N, Files.toString(temp, UTF_16LE));
  }

    StringBuilder builder2 = new StringBuilder();
    copied =
        CharStreams.copy(
            wrapAsGenericReadable(new StringReader(I18N)), wrapAsGenericAppendable(builder2));
    assertEquals(I18N, builder2.toString());
    assertEquals(I18N.length(), copied);
  }

  public void testCopy_toStringBuilder_fromReader() throws IOException {
    StringBuilder builder = new StringBuilder();

    StringBuilder builder2 = new StringBuilder();
    copied =
        CharStreams.copy(
            wrapAsGenericReadable(new StringReader(I18N)), wrapAsGenericAppendable(builder2));
    assertEquals(I18N, builder2.toString());
    assertEquals(I18N.length(), copied);
  }

  public void testCopy_toStringBuilder_fromReader() throws IOException {
    StringBuilder builder = new StringBuilder();

  public static ByteSinkFactory fileByteSinkFactory() {
    return new FileByteSinkFactory(null);
  }

  public static ByteSinkFactory appendingFileByteSinkFactory() {
    String initialString = IoTestCase.ASCII + IoTestCase.I18N;
    return new FileByteSinkFactory(initialString.getBytes(UTF_8));
  }

  public static CharSourceFactory fileCharSourceFactory() {
    return new FileCharSourceFactory();
  }

/**
 * Tests for the default implementations of {@code CharSink} methods.
 *
 * @author Colin Decker
 */
@NullUnmarked
public class CharSinkTest extends IoTestCase {

  private static final String STRING = ASCII + I18N;

  private TestCharSink sink;

  @Override
  public void setUp() {
    sink = new TestCharSink();
  }

  public void testOpenBufferedStream() throws IOException {

 * @author Colin Decker
 */
@NullUnmarked
public abstract class IoTestCase extends TestCase {

  private static final Logger logger = Logger.getLogger(IoTestCase.class.getName());

  static final String I18N =
      "\u00CE\u00F1\u0163\u00E9\u0072\u00F1\u00E5\u0163\u00EE\u00F6"
          + "\u00F1\u00E5\u013C\u00EE\u017E\u00E5\u0163\u00EE\u00F6\u00F1";

  static final String ASCII =

              "CharSource.empty[]", SourceSinkFactories.emptyCharSourceFactory(), asByteSource));
    }
    suite.addTestSuite(CharSourceTest.class);
    return suite;
  }

  private static final String STRING = ASCII + I18N;
  private static final String LINES = "foo\nbar\r\nbaz\rsomething";
  private static final ImmutableList<String> SPLIT_LINES =
      ImmutableList.of("foo", "bar", "baz", "something");

  private TestCharSource source;

              "CharSource.empty[]", SourceSinkFactories.emptyCharSourceFactory(), asByteSource));
    }
    suite.addTestSuite(CharSourceTest.class);
    return suite;
  }

  private static final String STRING = ASCII + I18N;
  private static final String LINES = "foo\nbar\r\nbaz\rsomething";
  private static final ImmutableList<String> SPLIT_LINES =
      ImmutableList.of("foo", "bar", "baz", "something");

  private TestCharSource source;