capsul-flask/docs/testing.md

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## automated testing
Automated tests could make it safer to contribute code, easier to review new code, and much easier to refactor, or upgrade Python dependencies.
To run tests:
1. create a Postgres database called `capsulflask_test`
- e.g.: `docker exec -it d1702306f409 psql -U postgres createdb -O postgres capsulflask_test;`
- (`d1702306f409` is the docker container ID of the postgres container)
2. run `python -m unittest`
### Architecture
I tried to make the absolute minimal changes to be able to override settings in tests possible alternative approaches include accepting an argument to create_app() to define which env file to load, or adding conditional logic to create_app() to pre-load specific settings before running load_dotenv() but allowing env vars to override dotenv vars seemed cleanest. (Thanks @forest for improving on this approach)
### Creating test databases
One outstanding question is how to initialise/reinitialise the test database.
Currently, the tests rely on the existence of a capsulflask_test database on localhost, accessible by the postgres user with password dev.
I create this manually using:
`docker exec -it d1702306f409 psql -U postgres createdb -O postgres capsulflask_test;`
where `d1702306f409` is the docker container ID of the postgres container.
In between test runs, you can either drop and recreate that database, or manually clear data using:
`docker exec -it d1702306f409 psql -U postgres capsulflask_test -c "DELETE FROM vms; DELETE FROM login_tokens; DELETE FROM ssh_public_keys; DELETE FROM api_tokens; DELETE FROM accounts;`
### Test coverage
This tests the "landing" (public) pages, login, capsul index and creation. I didn't add automated coverage reporting yet, unclear if that seems useful.