test(sample/01) fix broken tests

- update jest configuration to remove warnings
- fix tests so that they run out of the box with correct types
- remove duplicate key from docker-compose

integration/docker-compose.yml

@@ -24,7 +24,6 @@ services:
     restart: always
   mysql:
     image: mysql:5.7.25
-    restart: always
     environment:
       MYSQL_ROOT_PASSWORD: root
       MYSQL_DATABASE: test
@@ -43,4 +42,4 @@ services:
     ports:
       - "15672:15672"
       - "5672:5672"
-    tty: true
+    tty: true

sample/01-cats-app/e2e/jest-e2e.json

@@ -6,7 +6,7 @@
         "json"
     ],
     "transform": {
-        "^.+\\.tsx?$": "<rootDir>/../node_modules/ts-jest/preprocessor.js"
+        "^.+\\.tsx?$": "ts-jest"
     },
     "testRegex": "/e2e/.*\\.(e2e-test|e2e-spec).(ts|tsx|js)$",
     "collectCoverageFrom" : ["src/**/*.{js,jsx,tsx,ts}", "!**/node_modules/**", "!**/vendor/**"],

sample/01-cats-app/jest.json

@@ -6,7 +6,7 @@
         "json"
     ],
     "transform": {
-        "^.+\\.tsx?$": "<rootDir>/node_modules/ts-jest/preprocessor.js"
+        "^.+\\.tsx?$": "ts-jest"
     },
     "testRegex": "/src/.*\\.(test|spec).(ts|tsx|js)$",
     "collectCoverageFrom" : ["src/**/*.{js,jsx,tsx,ts}", "!**/node_modules/**", "!**/vendor/**"],

sample/01-cats-app/src/cats/cats.controller.spec.ts

@@ -1,6 +1,7 @@
 import { Test } from '@nestjs/testing';
 import { CatsController } from './cats.controller';
 import { CatsService } from './cats.service';
+import { Cat } from './interfaces/cat.interface';
 
 describe('CatsController', () => {
   let catsController: CatsController;
@@ -18,7 +19,13 @@ describe('CatsController', () => {
 
   describe('findAll', () => {
     it('should return an array of cats', async () => {
-      const result = ['test'];
+      const result: Cat[] = [
+        {
+          age: 2,
+          breed: 'Bombay',
+          name: 'Pixel',
+        },
+      ];
       jest.spyOn(catsService, 'findAll').mockImplementation(() => result);
 
       expect(await catsController.findAll()).toBe(result);