Mocked storage change events for mocked storage area

tests/mocks/ChromeEvent.ts

@@ -1,9 +1,9 @@
 export default class ChromeEvent<T extends Function> implements chrome.events.Event<T> {
-    addListener = vi.fn();
-    getRules = vi.fn();
-    hasListener = vi.fn();
-    removeRules = vi.fn();
-    addRules = vi.fn();
-    removeListener = vi.fn();
-    hasListeners = vi.fn();
+  addListener = vi.fn();
+  getRules = vi.fn();
+  hasListener = vi.fn();
+  removeRules = vi.fn();
+  addRules = vi.fn();
+  removeListener = vi.fn();
+  hasListeners = vi.fn();
 }