Fix issue #28

Dockerfile

@@ -0,0 +1,13 @@
+FROM node:18-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+
+RUN npm ci --only=production
+
+COPY dist ./dist
+
+EXPOSE 3000
+
+CMD ["node", "dist/main"]

jest.config.js

@@ -0,0 +1,13 @@
+module.exports = {
+  moduleFileExtensions: ['js', 'json', 'ts'],
+  rootDir: 'src',
+  testRegex: '.*\\.spec\\.ts$',
+  transform: {
+    '^.+\\.(t|j)s$': 'ts-jest',
+  },
+  collectCoverageFrom: [
+    '**/*.(t|j)s',
+  ],
+  coverageDirectory: '../coverage',
+  testEnvironment: 'node',
+};

src/app.service.spec.ts

@@ -0,0 +1,22 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { AppService } from './app.service';
+
+describe('AppService', () => {
+  let service: AppService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [AppService],
+    }).compile();
+
+    service = module.get<AppService>(AppService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+
+  it('should return "Hello World!"', () => {
+    expect(service.getHello()).toBe('Hello World!');
+  });
+});