Unit Test Implementation Guide

Mocking Dependencies

Use jest-mock-extended for External Dependencies

Use jest-mock-extended for dependencies that are external to the unit under test:

import { mock, mockDeep, mockFn, type MockProxy } from "jest-mock-extended";

let httpClient: MockProxy<HttpClient>;
let database: MockProxy<Database>;

beforeEach(() => {
  httpClient = mock<HttpClient>();
  database = mockDeep<Database>(); // Use mockDeep when mocking nested properties
});