feat: Implement auth serializer

packages/backend/src/serializers/auth.test.js

@@ -0,0 +1,17 @@
+import { describe, it, expect } from 'vitest';
+import App from '../models/app';
+import authSerializer from './auth';
+
+describe('authSerializer', () => {
+  it('should return auth data', async () => {
+    const auth = await App.findAuthByKey('deepl');
+
+    const expectedPayload = {
+      fields: auth.fields,
+      authenticationSteps: auth.authenticationSteps,
+      reconnectionSteps: auth.reconnectionSteps,
+    };
+
+    expect(authSerializer(auth)).toEqual(expectedPayload);
+  });
+});