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Node Challenge

Take home test for Node.js developers.

The challenge

This challenge has been designed to measure your knowledge of Node.js, Express, Typescript and various technologies, like monorepos, databases and testing. For your exercise, you will be enhancing this API which serves as the backend for a fictional Pleo app. Whenever a user of the app navigates to the expenses view, it calls this API to collect the list of expenses for that user.

Your objective is to write this new route to fetch the list of expenses for a given user. Right now that domain is empty, so you'll have to build everything from scratch- but you can look over at the user domain for inspiration. Please make sure that the endpoint scales adequately and supports paging, sorting and filtering. Additionally, we would also like you to write some tests for your route.

Finally, as a bonus objective, try to improve any aspect of this API. It could be to add more TS types, better security, tests, add features, graphql support, etc.

Instructions

Fork this repo with your solution. Ideally, we'd like to see your progression through commits, and don't forget to update the README.md to explain your thought process.

Please let us know how long the challenge takes you. We're not looking for how speedy or lengthy you are. It's just really to give us a clearer idea of what you've produced in the time you decided to take. Feel free to go as big or as small as you want.

Installing

Make sure that you have a modern version of yarn that supports workspaces (>= 1.0), then run:

yarn

Start a Postgres Docker container, or alternatively run Postgres outside docker.

docker run --name pleo-postgres -p 5432:5432 -e POSTGRES_PASSWORD=postgres -d postgres

Copy the .env.example file as .env and optionally update it to reflect the proper authentication for your locally running Postgres instance.

cp .env.example .env

Create a pleo_node_challenge database in your local instance. The following two steps assume your local postgres instance is running and accessible on 0.0.0.0:5432 as user postgres with password postgres. Please update below connection string accordingly if that's not the case.

psql -d "postgresql://postgres:[email protected]" -c 'CREATE DATABASE pleo_node_challenge'

Insert some dummy data:

psql -d "postgresql://postgres:[email protected]/pleo_node_challenge" < insert-dummy-data.sql

Running

To enable logs, use the standard NODE_DEBUG flag with the value DEBUG

NODE_DEBUG=DEBUG yarn start

Testing

Make sure that you have a modern version of yarn that supports workspaces, then run:

yarn test

The command above will run the following test suites sequentially:

Test suite	Run command	Description
Unit	yarn test:unit	Simple unit tests.
Mid-level	yarn test:mid-level	Small integration tests that integration of small components together.
Acceptances	yarn test:acceptance	Large integration tests, system tests, end-to-end tests.

Happy hacking 😁!