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Faster Django tests in PyCharm

PyCharm notes

Problem

Pressing the green play triangle button is slow.

pycharm-triangle.png

It runs python manage.py path_to_test

  • drops and creates a new test database
  • (slow 🐢)

Solution

We can update the Django tests template to add the --keepdb option

So that when you click on the green triangle, it will run

- python manage.py path_to_test
+ python manage.py path_to_test --keepdb
  1. Open the Run/Debug Configurations
    1. In the top right of PyCharm, click the box to the left of the green play button
    2. Click Edit Configurations...
    3. edit-configurations.png
  2. Add the --keepdb option to the Django tests
    1. 2022-pycharm-tests.png
Have an older version of PyCharm that doesn't match that screenshot?

Screenshot for PyCharm 2020.3

pycharm-django-config.png

Apply migrations in the test database

Tests failing because your migrations aren't in the test database?

  1. Get the name of your test database
    1. test database has the same name as the DATABASE_URL in .env with a test_ prefix
    2. example
      1. database name is my_db
      2. the test database is test_my_db
  2. Drop the test database
    1. dropdb test_my_db
  3. Run a test
    1. a new database will be created with the migrations

Last update: 2022-11-04