feat: setup Jest backend — config + deps + scripts test/watch/cov

backend/jest.config.ts

@@ -0,0 +1,15 @@
+import type { Config } from 'jest';
+
+const config: Config = {
+  moduleFileExtensions: ['js', 'json', 'ts'],
+  rootDir: 'src',
+  testRegex: '.*\\.spec\\.ts$',
+  transform: {
+    '^.+\\.(t|j)s$': 'ts-jest',
+  },
+  collectCoverageFrom: ['**/*.(t|j)s'],
+  coverageDirectory: '../coverage',
+  testEnvironment: 'node',
+};
+
+export default config;

backend/package.json

@@ -11,7 +11,10 @@
     "typeorm": "ts-node -r tsconfig-paths/register ./node_modules/typeorm/cli.js",
     "migration:generate": "npm run typeorm -- migration:generate src/migrations/$npm_config_name -d src/config/data-source.ts",
     "migration:run": "npm run typeorm -- migration:run -d src/config/data-source.ts",
-    "migration:revert": "npm run typeorm -- migration:revert -d src/config/data-source.ts"
+    "migration:revert": "npm run typeorm -- migration:revert -d src/config/data-source.ts",
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:cov": "jest --coverage"
   },
   "dependencies": {
     "@nestjs/common": "^11.1.17",
@@ -30,9 +33,13 @@
   "devDependencies": {
     "@nestjs/cli": "^11.0.16",
     "@nestjs/schematics": "^11.0.9",
+    "@nestjs/testing": "^11.1.18",
     "@types/cookie-parser": "^1.4.10",
     "@types/express": "^5.0.6",
+    "@types/jest": "^30.0.0",
     "@types/node": "^25.5.0",
+    "jest": "^30.3.0",
+    "ts-jest": "^29.4.9",
     "ts-node": "^10.9.2",
     "tsconfig-paths": "^4.2.0",
     "typescript": "^6.0.2"