assertThat(joiner.join(array)).isEqualTo("");

    StringBuilder sb1FromIterable = new StringBuilder();
    assertThat(joiner.appendTo(sb1FromIterable, set)).isSameInstanceAs(sb1FromIterable);
    assertEquals(0, sb1FromIterable.length());

    StringBuilder sb1FromIterator = new StringBuilder();
    assertThat(joiner.appendTo(sb1FromIterator, set)).isSameInstanceAs(sb1FromIterator);

        StringBuilder buf = new StringBuilder();

        StringBuilder result = monitorTarget.appendTimestamp(buf);
        assertSame(buf, result);
    }

    // Test appendException returns the same buffer instance
    @Test
    public void test_appendException_returnsSameBuffer() {
        StringBuilder buf = new StringBuilder();

            final String v = s.substring(CONTAINS.length());
            final StringBuilder buf = new StringBuilder(100);
            return ".*" + appendFileterPath(buf, escape(v)) + ".*";
        }
        if (s.startsWith(REGEXP_IGNORE_CASE)) {
            final String v = s.substring(REGEXP_IGNORE_CASE.length());
            final StringBuilder buf = new StringBuilder(100);
            buf.append("(?i)");

                break;
            case "appendJvmStats":
                hasAppendJvmStats = true;
                assertEquals("appendJvmStats should take StringBuilder parameter", 1, method.getParameterCount());
                assertEquals("appendJvmStats should take StringBuilder", StringBuilder.class, method.getParameterTypes()[0]);

        map.put("ツォ", new String[] { "tso" });

        return map;
    }

    private List<StringBuilder> deepCopyBufList(final List<StringBuilder> bufList) {
        final List<StringBuilder> list = new ArrayList<>();
        bufList.forEach(buf -> list.add(new StringBuilder(buf.toString())));
        return list;
    }

            writeJsonResponse(HttpServletResponse.SC_BAD_REQUEST, escapeJsonKeyValue(MESSAGE_FIELD, "Scroll Search is not available."));
            return;
        }

        final StringBuilder buf = new StringBuilder(1000);
        request.setAttribute(Constants.SEARCH_LOG_ACCESS_TYPE, Constants.SEARCH_LOG_ACCESS_TYPE_JSON);
        final JsonRequestParams params = new JsonRequestParams(request, fessConfig);
        try {

     */
    public static String toHex(final int i) {
        final StringBuilder buf = new StringBuilder();
        appendHex(buf, i);
        return new String(buf);
    }

    /**
     * Appends the hexadecimal string representation of a number to the given StringBuilder.
     *
     * @param buf
     *            the StringBuilder to append to
     * @param i
     *            the number to convert
     */

        ArtifactTypeRegistry registry = context.getSession().getArtifactTypeRegistry();
        if (logger.isDebugEnabled()) {
            StringBuilder sb = new StringBuilder();
            root.accept(new DependencyGraphDumper(
                    l -> sb.append(l).append("\n"),
                    DependencyGraphDumper.defaultsWith(

        GsaConfigParser parser = new GsaConfigParser();
        StringBuilder buf = new StringBuilder();

        assertEquals("", parser.appendFileterPath(buf, ""));
        assertEquals("", parser.appendFileterPath(buf, null));
        assertEquals("", parser.appendFileterPath(buf, "   "));

        assertEquals("^test.*", parser.appendFileterPath(new StringBuilder(), "^test"));

     * Package-private for testing.
     */
    static String parseJvmConfig(Path jvmConfigPath, String mavenProjectBasedir) throws IOException {
        StringBuilder result = new StringBuilder();

        for (String line : Files.readAllLines(jvmConfigPath, StandardCharsets.UTF_8)) {
            line = processLine(line, mavenProjectBasedir);
            if (line.isEmpty()) {