ash/documentation/topics/testing.md

Testing

Async tests

The first thing you will likely want to do, especially if you are using AshPostgres, is to add the following config to your config/test.exs.

# config/test.exs
config :ash, :disable_async?, true

This ensures that Ash does not spawn tasks when executing your requests, which is necessary for doing transactional tests with AshPostgres.