XWIKI-22187: Cannot get revisions with a criteria on a document not stored in DB

  * Provide utilities in TestUtils for new integration test

xwiki-platform-core/xwiki-platform-test/xwiki-platform-test-ui/src/main/java/org/xwiki/test/ui/TestUtils.java

@@ -1214,6 +1214,46 @@ public String executeWiki(String wikiContent, Syntax wikiSyntax) throws Exceptio
         return executeAndGetBodyAsString(reference, null);
     }
 
+    /**
+     * @since 16.4.0RC1
+     * @since 15.10.11
+     */
+    public String executeWikiPlain(String wikiContent, Syntax wikiSyntax) throws Exception
+    {
+        Map<String, String> queryParameters = new HashMap<>();
+        queryParameters.put("outputSyntax", "plain");
+
+        return executeWiki(wikiContent, wikiSyntax, queryParameters);
+    }
+
+    /**
+     * @since 16.4.0RC1
+     * @since 15.10.11
+     */
+    public String executeWiki(String wikiContent, Syntax wikiSyntax, Map<String, String> queryParameters)
+        throws Exception
+    {
+        LocalDocumentReference reference =
+            new LocalDocumentReference(List.of("Test", "Execute"), UUID.randomUUID().toString());
+
+        // Remember the current credentials
+        UsernamePasswordCredentials currentCredentials = getDefaultCredentials();
+
+        try {
+            // Make sure the page is saved with superadmin author
+            setDefaultCredentials(SUPER_ADMIN_CREDENTIALS);
+
+            // Save the page with the content to execute
+            rest().savePage(reference, wikiContent, wikiSyntax.toIdString(), null, null);
+        } finally {
+            // Restore initial credentials
+            setDefaultCredentials(currentCredentials);
+        }
+
+        // Execute the content and return the result
+        return executeAndGetBodyAsString(reference, queryParameters);
+    }
+
     /**
      * @since 7.2M2
      */