Fix and simplify JS quirks tests

doc/changelog.asciidoc

@@ -45,7 +45,7 @@ Fixed
   error is shown instead).
 - The default user agent now only contains the shortened Chromium version
   number, which fixes overzealous blocking on ScienceDirect.
-- New site-specific quirk to fix existing accounts showing as non-existant on
+- New site-specific quirk to fix existing accounts showing as non-existent on
   Digitec/Galaxus.
 - Resolved issues in userscripts:
     * `qute-bitwarden` will now prompt a re-login if its cached session has

tests/unit/javascript/test_js_quirks.py

@@ -61,17 +61,17 @@ def test_js_quirks_match_files(webengine_tab):
 
 
 def test_js_quirks_match_settings(webengine_tab, configdata_init):
+    quirks_code = {q.name for q in webengine_tab._scripts._get_quirks()}
+
     opt = configdata.DATA["content.site_specific_quirks.skip"]
-    prefix = "js-"
     valid_values = opt.typ.get_valid_values()
     assert valid_values is not None
     quirks_config = {
-        val.removeprefix(prefix).replace("-", "_")
+        val
         for val in valid_values
-        if val.startswith(prefix)
+        # some JS quirks are actually only setting the user agent, so we include
+        # those as well.
+        if val.startswith("js-") or (val.startswith("ua-") and val in quirks_code)
     }
 
-    quirks_code = {q.filename for q in webengine_tab._scripts._get_quirks()}
-    quirks_code -= {"googledocs"}  # special case, UA quirk
-
     assert quirks_code == quirks_config