Add unit and e2e tests for PaymentsController, PaymentsService, and AppController

src/modules/payments/tests/payments.controller.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { PaymentsController } from '../payments.controller';
+import { PaymentsService } from '../payments.service';
+
+describe('PaymentsController', () => {
+  let controller: PaymentsController;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      controllers: [PaymentsController],
+      providers: [PaymentsService],
+    }).compile();
+
+    controller = module.get<PaymentsController>(PaymentsController);
+  });
+
+  it('should be defined', () => {
+    expect(controller).toBeDefined();
+  });
+});

src/modules/payments/tests/payments.service.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { PaymentsService } from '../payments.service';
+
+describe('PaymentsService', () => {
+  let service: PaymentsService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [PaymentsService],
+    }).compile();
+
+    service = module.get<PaymentsService>(PaymentsService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});

test/app.e2e-spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { INestApplication } from '@nestjs/common';
+import * as request from 'supertest';
+import { App } from 'supertest/types';
+import { AppModule } from './../src/app.module';
+
+describe('AppController (e2e)', () => {
+  let app: INestApplication<App>;
+
+  beforeEach(async () => {
+    const moduleFixture: TestingModule = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+
+    app = moduleFixture.createNestApplication();
+    await app.init();
+  });
+
+  it('/ (GET)', () => {
+    return request(app.getHttpServer())
+      .get('/')
+      .expect(200)
+      .expect('Hello World!');
+  });
+});

test/jest-e2e.json

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+{
+  "moduleFileExtensions": ["js", "json", "ts"],
+  "rootDir": ".",
+  "testEnvironment": "node",
+  "testRegex": ".e2e-spec.ts$",
+  "transform": {
+    "^.+\\.(t|j)s$": "ts-jest"
+  }
+}