test(electron): add unit tests for updater (#5439)

packages/frontend/electron/test/main/mocks/app-adapter.ts

@@ -0,0 +1,34 @@
+import type { AppAdapter } from 'electron-updater/out/AppAdapter';
+
+/**
+ * For testing and same as:
+ * https://github.com/electron-userland/electron-builder/blob/master/packages/electron-updater/src/ElectronAppAdapter.ts
+ */
+export class MockedAppAdapter implements AppAdapter {
+  version: string;
+  name = 'AFFiNE-testing';
+  isPackaged = true;
+  appUpdateConfigPath = '';
+  userDataPath = '';
+  baseCachePath = '';
+
+  constructor(version: string) {
+    this.version = version;
+  }
+
+  whenReady() {
+    return Promise.resolve();
+  }
+
+  relaunch() {
+    return;
+  }
+
+  quit() {
+    return;
+  }
+
+  onQuit(_handler: (exitCode: number) => void) {
+    return;
+  }
+}