[tests] Selenium: allow passing html ID to hide_loading_overlay

Author: nemesifier

openwisp_utils/tests/selenium.py

@@ -199,10 +199,10 @@ def wait_for(self, method, by, value, timeout=2, driver=None):
             print(self.get_browser_logs(driver))
             self.fail(f'{method} of "{value}" failed: {e}')
 
-    def hide_loading_overlay(self, timeout=2, driver=None):
+    def hide_loading_overlay(self, html_id='loading-overlay', timeout=2, driver=None):
         """The geckodriver can't figure out the loading overlay is still fading out, so let's just hide it."""
         driver = driver or self.web_driver
         driver.execute_script(
-            'document.getElementById("loading-overlay").style.display="none";'
+            f'document.getElementById("{html_id}").style.display="none";'
         )
-        self.wait_for_invisibility(By.CSS_SELECTOR, '#loading-overlay', timeout, driver)
+        self.wait_for_invisibility(By.ID, html_id, timeout, driver)