egg-mock

import mm from 'egg-mock'; import path from 'path'; import assert from 'assert'; import { Application } from 'egg'; // Assuming 'egg' types are available describe('Basic Egg.js Application Testing', () => { let app: Application; // Use egg's Application type for clarity // 1. Setup: Create a mock Egg.js application before all tests before(async () => { // mm.app starts an Egg application instance in test mode app = mm.app({ baseDir: path.join(__dirname, 'fixtures/apps/simple-app'), // Path to a minimal test application // customEgg: path.join(__dirname, '../node_modules/egg'), // Specify egg framework path if not default }); // Wait for the application to be fully initialized and ready await app.ready(); }); // 2. Teardown: Close the mock application gracefully after all tests after(() => app.close()); // 3. Cleanup: Restore all mocked data after each test to prevent side effects afterEach(mm.restore); it('should make a GET request to / and receive a 200 response', async () => { // Mock a service method to control its behavior during the test app.mockService('home', 'getGreeting', (name: string) => `Hello, ${name} from mock!`); // Use app.httpRequest() (based on supertest) to simulate an HTTP request const response = await app.httpRequest() .get('/') // The route to test .expect(200); // Expect an HTTP 200 OK status // Assert the response body content (assuming / calls home.getGreeting('world')) assert.strictEqual(response.text, 'Hello, world from mock!'); }); it('should allow mocking the application configuration', async () => { // Mock a specific configuration item app.mockConfig('middleware', ['myCustomMiddleware']); // Access the mocked config (actual effect might require app restart for some configs) assert.deepStrictEqual(app.config.middleware, ['myCustomMiddleware']); }); it('should mock a context property', async () => { // Create a new mock context instance const ctx = app.mockContext({ foo: 'bar', userId: 123, }); // Assert the mocked properties on the context assert.strictEqual(ctx.foo, 'bar'); assert.strictEqual(ctx.userId, 123); }); });