public void test_append_nullValue() {
        StringBuilder buf = new StringBuilder();
        Supplier<Object> supplier = () -> null;

        monitorTarget.append(buf, "testKey", supplier);
        assertEquals("\"testKey\":null", buf.toString());
    }

    // Test append method with Integer value
    public void test_append_integerValue() {
        StringBuilder buf = new StringBuilder();

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

    }

    @Test
    @DisplayName("Should handle StringBuilder as CharSequence")
    void testJoinWithStringBuilder() {
        StringBuilder sb1 = new StringBuilder("first");
        StringBuilder sb2 = new StringBuilder("second");
        String result = StringUtil.join(",", sb1, sb2);
        assertEquals("first,second", result);
    }

    @Test

        }
    }

    private StringBuilder getStringBuilder() {
        StringBuilder sb = stringBuilderPool.poll();
        if (sb == null) {
            sb = new StringBuilder(512); // Pre-allocate reasonable size
        } else {
            sb.setLength(0); // Reset length
        }
        return sb;
    }

    private void returnStringBuilder(StringBuilder sb) {

        }
        return data;
    }

    /**
     * Create a test string with specified length
     */
    protected String createTestString(int length) {
        StringBuilder sb = new StringBuilder(length);
        for (int i = 0; i < length; i++) {
            sb.append((char) ('A' + (i % 26)));
        }
        return sb.toString();
    }

    int readScopeWireFormat(final byte[] src, int srcIndex) {
        final int start = srcIndex;
        int n;
        StringBuilder sb;

        n = src[srcIndex++] & 0xFF;
        if (n == 0) {
            this.scope = null;
            return 1;
        }

        sb = new StringBuilder(Strings.fromOEMBytes(src, srcIndex, n, this.config));
        srcIndex += n;
        while ((n = src[srcIndex++] & 0xFF) != 0) {

        assertNull(exception.getCause());
    }

    public void test_constructor_withLongUrls() {
        // Test with very long URLs
        StringBuilder longParentUrl = new StringBuilder("http://example.com/");
        StringBuilder longUrl = new StringBuilder("http://example.com/");
        for (int i = 0; i < 100; i++) {
            longParentUrl.append("parent/");
            longUrl.append("child/");
        }

    public void test_veryLongStrings() {
        // Test with very long strings
        StringBuilder longNameBuilder = new StringBuilder();
        for (int i = 0; i < 10000; i++) {
            longNameBuilder.append("a");
        }
        String longName = longNameBuilder.toString();

        StringBuilder longValueBuilder = new StringBuilder();
        for (int i = 0; i < 10000; i++) {
            longValueBuilder.append("b");

        final int start = srcIndex;
        int n;
        StringBuilder sb;

        n = src[srcIndex++] & 0xFF;
        if (n == 0) {
            scope = null;
            return 1;
        }

        try {
            sb = new StringBuilder(new String(src, srcIndex, n, Name.OEM_ENCODING));
            srcIndex += n;

        if (log.isDebugEnabled() && holder.allocationStackTrace != null) {
            StringBuilder sb = new StringBuilder("Allocation stack trace:\n");
            for (StackTraceElement element : holder.allocationStackTrace) {
                sb.append("\tat ").append(element).append("\n");
            }