Point to a solution when the "Unknown premium setting xxx" is shown during tests (#48526)

enterprise/frontend/src/metabase-enterprise/settings/index.ts

 import { hasAnySsoFeature } from "metabase/common/utils/plan";
+import { isTest } from "metabase/env";
 import MetabaseSettings from "metabase/lib/settings";
 import type { TokenFeature } from "metabase-types/api";
 
 export function hasPremiumFeature(feature: TokenFeature) {
   const hasFeature = MetabaseSettings.get("token-features")?.[feature];
   if (hasFeature == null) {
-    console.warn("Unknown premium feature", feature);
+    console.warn(
+      `Unknown premium feature: '${feature}'.`,
+      isTest
+        ? "\nDid you forget to use `mockSettings` instead of `createMockSettings` when testing paid features?"
+        : "",
+    );
   }
   return hasFeature;
 }

frontend/test/__support__/settings.ts

@@ -4,6 +4,10 @@ import type { Settings } from "metabase-types/api";
 import { createMockSettings } from "metabase-types/api/mocks";
 import { createMockSettingsState } from "metabase-types/store/mocks";
 
+/**
+ * This function mocks the settings also in MetabaseSettings,
+ * without that, you'll get the annoying "Unknown premium feature xxx" warning.
+ */
 export function mockSettings(
   params: Partial<Settings | EnterpriseSettings> = {},
 ) {