}

  public void testSimple() throws Exception {
    String testString = "abcdefgh";
    CharSource source = newCharSource(testString);
    Reader joinedReader = CharSource.concat(source, source).openStream();

    String expectedString = testString + testString;
    assertEquals(expectedString, CharStreams.toString(joinedReader));
  }

  private static CharSource newCharSource(String text) {
    return new CharSource() {
      @Override

	}
}

func saveKeyEtcdWithTTL(ctx context.Context, client *etcd.Client, key string, data []byte, ttl int64) error {
	timeoutCtx, cancel := context.WithTimeout(ctx, defaultContextTimeout)
	defer cancel()
	lease, err := client.Grant(timeoutCtx, ttl)
	if err != nil {
		return etcdErrToErr(err, client.Endpoints())
	}
	_, err = client.Put(timeoutCtx, key, string(data), etcd.WithLease(lease.ID))
	etcdLogIf(ctx, err)

        assertNotNull(negativeProvider);
    }

    // Test getTimeAdjustTimeMillis string values
    public void test_getTimeAdjustTimeMillis_stringValues() {
        // Test various string formats
        String[] testValues = { "0", "1000", "-1000", "999999999", "-999999999", "1", "-1" };

        for (String value : testValues) {
            FessConfig testConfig = new FessConfig.SimpleImpl() {

    protected Artifact createArtifact(String artifactId, String version) throws Exception {
        return createArtifact(artifactId, version, "jar");
    }

    protected Artifact createArtifact(String artifactId, String version, String type) throws Exception {
        return createArtifact("org.apache.maven", artifactId, version, type);
    }

    @Override
    public String asTableDbName() {
        return asEsIndexType();
    }

    @Override
    protected String asEsIndex() {
        return "fess_config.crawling_info";
    }

    @Override
    public String asEsIndexType() {
        return "crawling_info";
    }

    @Override
    public String asEsSearchType() {
        return "crawling_info";
    }

    @Override
    public String asTableDbName() {
        return asEsIndexType();
    }

    @Override
    protected String asEsIndex() {
        return "fess_config.elevate_word";
    }

    @Override
    public String asEsIndexType() {
        return "elevate_word";
    }

    @Override
    public String asEsSearchType() {
        return "elevate_word";
    }

    @Override
    public String asTableDbName() {
        return asEsIndexType();
    }

    @Override
    protected String asEsIndex() {
        return "fess_config.path_mapping";
    }

    @Override
    public String asEsIndexType() {
        return "path_mapping";
    }

    @Override
    public String asEsSearchType() {
        return "path_mapping";
    }

     * @param args arguments referenced by the format specifiers in the format string
     * @return the current builder
     */
    @Nonnull
    default MessageBuilder format(String pattern, Object... args) {
        return append(String.format(pattern, args));
    }

    /**
     * Set the buffer length.
     *
     * @param length the new length

		{"small-1", []int64{509}, make(map[string]string)},
		{"small-2", []int64{5 * oneMiB}, make(map[string]string)},
		// // // cases 5-8: multipart part objects
		{"mp-0", []int64{5 * oneMiB, 1}, make(map[string]string)},
		{"mp-1", []int64{5*oneMiB + 1, 1}, make(map[string]string)},
		{"mp-2", []int64{5487701, 5487799, 3}, make(map[string]string)},
		{"mp-3", []int64{10499807, 10499963, 7}, make(map[string]string)},

}

// Interface logger interface
type Interface interface {
	LogMode(LogLevel) Interface
	Info(context.Context, string, ...interface{})
	Warn(context.Context, string, ...interface{})
	Error(context.Context, string, ...interface{})
	Trace(ctx context.Context, begin time.Time, fc func() (sql string, rowsAffected int64), err error)
}

var (
	// Discard logger will print any log to io.Discard