Python Auto Test

I’m trying to use an Auto Devops pipeline for my Python project. However, Auto Test fails with the following output:

$ /bin/herokuish buildpack test
-----> Python app detected
Selected buildpack does not support test feature
ERROR: Job failed: exit code 1

However, the Gitlab Auto Devops documentation suggests that the Python buildpack does indeed support Auto Test, and some Googling suggests I’m supposed to specify a test command for the buildpack to pick up on.

Does anone know either how I do this, or have an example of a Python project that works with Auto Devops that I can take a look at?