Extracted preferences & entity stubs to make them reusable

tests/stubs/Preferences.ts

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+import CacheablePreferences, { PreferenceField, type WithFields } from "$lib/extension/base/CacheablePreferences";
+import ChromeStorageArea from "$tests/mocks/ChromeStorageArea";
+import StorageHelper from "$lib/browser/StorageHelper";
+import ConfigurationController from "$lib/extension/ConfigurationController";
+
+export interface TestedFields {
+  numberField: number;
+  stringField: string;
+}
+
+export class TestedPreferences extends CacheablePreferences<TestedFields> implements WithFields<TestedFields> {
+  readonly defaults: TestedFields;
+  readonly mockedSettingsNamespace: string;
+  readonly mockedStorageArea: ChromeStorageArea;
+  readonly mockedStorageHelper: StorageHelper;
+
+  numberField;
+  stringField;
+
+  constructor(settingsNamespace: string, mockedDefaults: TestedFields) {
+    const mockedStorageArea = new ChromeStorageArea();
+    const mockedStorageHelper = new StorageHelper(mockedStorageArea);
+    const mockedConfigurationController = new ConfigurationController(
+      settingsNamespace,
+      mockedStorageHelper,
+    );
+
+    super(settingsNamespace, mockedConfigurationController);
+
+    this.mockedSettingsNamespace = settingsNamespace;
+    this.mockedStorageArea = mockedStorageArea;
+    this.mockedStorageHelper = mockedStorageHelper;
+    this.defaults = mockedDefaults;
+
+    this.numberField = new PreferenceField(this, {
+      field: 'numberField',
+      defaultValue: this.defaults.numberField,
+    });
+
+    this.stringField = new PreferenceField(this, {
+      field: 'stringField',
+      defaultValue: this.defaults.stringField,
+    });
+  }
+}