Add lowercaseElementNames unit test and make method public (#1860)

* Add XPath JSoup filter tests and make lowercaseElementNames public

Tests cover attribute extraction (/@attr), tidyText(), allText(),
html() functions, uppercase element name handling, fallback expression
logic, and the lowercaseElementNames() utility method.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Formatting fix again

Signed-off-by: Julien Nioche <julien@digitalpebble.com>

---------

Signed-off-by: Julien Nioche <julien@digitalpebble.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: jnioche

core/src/main/java/org/apache/stormcrawler/jsoup/XPathFilter.java

@@ -92,7 +92,7 @@ String evaluate(Element element, String attrName) {
      * Lowercases element names in an XPath expression to match JSoup's normalized tag names. For
      * example, {@code //SPAN[@class="concept"]} becomes {@code //span[@class="concept"]}.
      */
-    static String lowercaseElementNames(String xpath) {
+    public static String lowercaseElementNames(String xpath) {
         return ELEMENT_NAME
                 .matcher(xpath)
                 .replaceAll(m -> m.group().toLowerCase(java.util.Locale.ROOT));

core/src/test/java/org/apache/stormcrawler/jsoup/JSoupFiltersTest.java

@@ -155,4 +155,19 @@ void testFallbackExpressions() throws IOException {
         Assertions.assertNotNull(fallback, "Fallback expression should have matched");
         Assertions.assertTrue(fallback.contains("Main Title"));
     }
+
+    @Test
+    void testLowercaseElementNames() {
+        Assertions.assertEquals(
+                "//span[@class=\"concept\"]",
+                XPathFilter.lowercaseElementNames("//SPAN[@class=\"concept\"]"));
+        Assertions.assertEquals(
+                "//meta[@name=\"keywords\"]/@content",
+                XPathFilter.lowercaseElementNames("//META[@name=\"keywords\"]/@content"));
+        Assertions.assertEquals(
+                "//*[@class=\"x\"]", XPathFilter.lowercaseElementNames("//*[@class=\"x\"]"));
+        Assertions.assertEquals(
+                "//div/span/a[@href]", XPathFilter.lowercaseElementNames("//DIV/SPAN/A[@href]"));
+        Assertions.assertEquals("//title", XPathFilter.lowercaseElementNames("//title"));
+    }
 }