Why is Permission table populated in test database, while others aren't (django python)?

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While playing around with django testing I noticed that Permission table in test database is not empty (like, for example, User and tables of models defined by me) - it has all permissions from the real table. pdb

My questions:

  1. Is the Permission table the only prepopulated table? (I have trouble inspecting other tables, because db is in-memory)
  2. Where is it prepopulated (I also couldn't find)? Upon setting up test suit? Or just before executing each test method? Or maybe added to queryset everytime it is requested?
testing django python
1 Answers

Permissions are created when you run manage.py migrate, there is a signal handler that listens to the post_migrate signal and creates these permissions for every new model.

Docs

The ContentType table will also be populated in a similar manner

When you run your tests, your test DB will have your migrations applied to it

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