InputStreamThread thread = new InputStreamThread(is, StandardCharsets.UTF_8, 0, null);
        thread.start();
        thread.join(1000);

        assertFalse(thread.contains("test"));
    }

    @Test
    public void test_run_withDifferentCharsets() throws InterruptedException {
        String input = "UTF-16 test";

            byte[] utf8Bytes = Strings.getBytes(TEST_STRING, StandardCharsets.UTF_8);
            byte[] utf16Bytes = Strings.getBytes(TEST_STRING, StandardCharsets.UTF_16LE);

            // Then
            assertNotNull(utf8Bytes, "UTF-8 bytes should not be null");
            assertNotNull(utf16Bytes, "UTF-16LE bytes should not be null");
            assertTrue(utf8Bytes.length > 0, "UTF-8 bytes should not be empty");

/**
 * Constants class.
 *
 * @author shinsuke
 *
 */
public class CoreLibConstants {

    /**
     * UTF-8
     */
    public static final String UTF_8 = "UTF-8";

    /**
     * UTF-8 Charset.
     */
    public static final Charset CHARSET_UTF_8 = Charset.forName(UTF_8);

    /**
     * ISO 8601 basic format: yyyyMMdd'T'HHmmss.SSSZ
     */

   */
  @Deprecated public static final Charset ISO_8859_1 = StandardCharsets.ISO_8859_1;

  /**
   * UTF-8: eight-bit UCS Transformation Format.
   *
   * @deprecated Use {@link StandardCharsets#UTF_8} instead.
   */
  @Deprecated public static final Charset UTF_8 = StandardCharsets.UTF_8;

  /**
   * UTF-16BE: sixteen-bit UCS Transformation Format, big-endian byte order.
   *

   */
  @Deprecated public static final Charset ISO_8859_1 = StandardCharsets.ISO_8859_1;

  /**
   * UTF-8: eight-bit UCS Transformation Format.
   *
   * @deprecated Use {@link StandardCharsets#UTF_8} instead.
   */
  @Deprecated public static final Charset UTF_8 = StandardCharsets.UTF_8;

  /**
   * UTF-16BE: sixteen-bit UCS Transformation Format, big-endian byte order.
   *

    assertThat(Charsets.UTF_8).isEqualTo(Charset.forName("UTF-8"));
  }

  @J2ktIncompatible
  @GwtIncompatible // Non-UTF-8 Charset
  public void testUtf16be() {
    assertThat(Charsets.UTF_16BE).isEqualTo(Charset.forName("UTF-16BE"));
  }

  @J2ktIncompatible
  @GwtIncompatible // Non-UTF-8 Charset
  public void testUtf16le() {
    assertThat(Charsets.UTF_16LE).isEqualTo(Charset.forName("UTF-16LE"));
  }

            mappings = new String(is1.readAllBytes(), StandardCharsets.UTF_8);
        }

        try (InputStream is2 = getClass().getClassLoader().getResourceAsStream("suggest_indices/suggest.json")) {
            assertNotNull("Settings resource should exist", is2);
            settings = new String(is2.readAllBytes(), StandardCharsets.UTF_8);
        }

        assertNotNull("Mappings should be loaded", mappings);

     * A constant for "false".
     */
    public static final String FALSE = "false";

    /**
     * A constant for "UTF-8".
     */
    public static final String UTF_8 = "UTF-8";

    /**
     * A constant for UTF-8 charset.
     */
    public static final Charset UTF_8_CHARSET = StandardCharsets.UTF_8;

    /**
     * The default charset.
     */
    public static final Charset DEFAULT_CHARSET;

    /**

    assertThat(Resources.toString(resource, UTF_8)).isEqualTo(I18N);
    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));
  }

  public void testReadLines() throws IOException {

    assertThat(Resources.toString(resource, UTF_8)).isEqualTo(I18N);
    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));
  }

  public void testReadLines() throws IOException {