test(sample-02): added e2e tests

sample/02-gateways/e2e/events-gateway/gateway.e2e-spec.ts

@@ -0,0 +1,53 @@
+import { INestApplication } from '@nestjs/common';
+import { Test } from '@nestjs/testing';
+import { AppModule } from '../../src/app.module';
+import { io, Socket } from 'socket.io-client';
+
+describe('EventsGateway', () => {
+  let app: INestApplication;
+  let socket: Socket;
+
+  beforeAll(async () => {
+    const moduleRef = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+
+    app = moduleRef.createNestApplication();
+    await app.listen(3000);
+  });
+
+  beforeEach(() => {
+    socket = io('http://localhost:3000');
+    socket.connect();
+  });
+
+  describe('findAll', () => {
+    it('should receive 3 numbers', done => {
+      let eventCount = 1;
+      socket.emit('events', { test: 'test' });
+      socket.on('events', data => {
+        expect(data).toBe(eventCount);
+        if (++eventCount > 3) {
+          done();
+        }
+      });
+    });
+  });
+
+  describe('identity', () => {
+    it('should return the same number has what was sent', done => {
+      socket.emit('identity', 0, response => {
+        expect(response).toBe(0);
+        done();
+      });
+    });
+  });
+
+  afterEach(() => {
+    socket.disconnect();
+  });
+
+  afterAll(async () => {
+    await app.close();
+  });
+});

sample/02-gateways/e2e/jest-e2e.json

@@ -0,0 +1,14 @@
+{
+    "moduleFileExtensions": [
+        "ts",
+        "tsx",
+        "js",
+        "json"
+    ],
+    "transform": {
+        "^.+\\.tsx?$": "ts-jest"
+    },
+    "testRegex": "/e2e/.*\\.(e2e-test|e2e-spec).(ts|tsx|js)$",
+    "collectCoverageFrom" : ["src/**/*.{js,jsx,tsx,ts}", "!**/node_modules/**", "!**/vendor/**"],
+    "coverageReporters": ["json", "lcov"]
+}

sample/02-gateways/package.json

@@ -16,7 +16,7 @@
     "test:watch": "jest --watch",
     "test:cov": "jest --coverage",
     "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
-    "test:e2e": "echo 'No e2e tests implemented yet.'"
+    "test:e2e": "jest --config ./e2e/jest-e2e.json"
   },
   "dependencies": {
     "@nestjs/common": "9.0.1",
@@ -37,7 +37,7 @@
     "@nestjs/schematics": "9.0.1",
     "@nestjs/testing": "9.0.1",
     "@types/express": "4.17.13",
-    "@types/jest": "^28.1.4",
+    "@types/jest": "28.1.4",
     "@types/node": "18.0.3",
     "@types/supertest": "2.0.12",
     "@types/ws": "8.5.3",

sample/02-gateways/src/events/events.gateway.spec.ts

@@ -18,7 +18,7 @@ describe('EventsGateway', () => {
   });
 
   describe('findAll', () => {
-    it('should return an array of items', done => {
+    it('should return 3 numbers', done => {
       gateway
         .findAll({})
         .pipe(reduce((acc, item) => [...acc, item], []))