fix: run tests in band

package.json

@@ -9,7 +9,7 @@
     "build": "rimraf ./dist && tsc --project tsconfig.build.json",
     "start": "node dist/src/index.js",
     "start-ts": "ts-node ./src/index.ts",
-    "test": "jest",
+    "test": "jest --runInBand",
     "migrate": "ts-node node_modules/.bin/node-pg-migrate -j ts",
     "lint:eslint": "eslint . --ext .js,.jsx,.ts,.tsx -f unix",
     "lint:prettier": "prettier --check src/**/*.ts tests/**/*.ts migrations/**/*.ts",