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DEVELOPING.md

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Guide for local development

dev script

The dev script contains a number of useful commands for local development and testing:

  • new-migration - Create a new database migration file
  • run <command> - Run arbitrary command in the test container
  • serve - Run the application, binding to local port 8000
  • shell - Start an interactive bash shell in the tests container
  • tests - Run the test suite once
  • upgrade-requirements - Generate the pip-tools/*requirements.txt files from pip-tools/*requirements.in
  • watch-tests - Continually watch for file changes and run tests

You can run these commands like so:

./dev tests

Troubleshooting

If you get an error like this when running the dev script:

./dev: line 10: conditional binary operator expected

Then you can either:

  • Upgrade your bash shell version using homebrew and try again

  • Run the script using zsh

    zsh ./dev tests

Running and debugging tests

Prerequisites

  • Python 3.8 + pip

Install dependencies

python -m venv venv # Create virtual environment
source ./venv/bin/activate # Activate virtual environment
pip install -r requirements.txt # Install requirements
pip install -r pip-tools/dev-requirements.txt # Install requirements

Create your .env file

Create an .env file which minimally contains:

FLASK_APP="broker.app:create_app()"
FLASK_ENV=local-debugging
PGPASSWORD=<your-password>

Start up local PostgreSQL database

Export the PostgreSQL password that you set in .env as an environment variable in your shell so that Docker can set it on the database:

export PGPASSWORD=<your-password>

Then, start up a PostgreSQL service that will be exposed on localhost:5432, which is what is expected by the test suite configuration:

cd docker
docker-compose up -d  # Start up services in docker-compose.yml

The -d flag is optional. If you omit, then logs from the PostgreSQL container will stream to your terminal, which may be helpful in debugging tests.

Run + debug tests in VScode

Follow the VScode documentation to discover, to run, and to debug the tests in VScode.