assertTrue(sitemapsHelper.isValidPriority("0.0"));
        assertTrue(sitemapsHelper.isValidPriority("0.5"));
        assertTrue(sitemapsHelper.isValidPriority("1.0"));
        assertTrue(sitemapsHelper.isValidPriority(null));
        assertTrue(sitemapsHelper.isValidPriority(""));

        // Invalid priority
        assertFalse(sitemapsHelper.isValidPriority("-0.1"));

    /**
     * Validates a priority value according to sitemap specification.
     * @param priority the priority to validate
     * @return true if valid, false otherwise
     */
    protected boolean isValidPriority(final String priority) {
        if (priority == null || priority.isEmpty()) {
            return true; // Priority is optional
        }
        try {
            final double value = Double.parseDouble(priority);