Yay, thanks! Some docs to help you in https://ddev.readthedocs.io/en/latest/developers/quickstart-maintenance/#automated-tests and feel free to contribute to that or make suggestions as well.

Feel free to take this on as a PR when you get to it. Thanks! Closing for now.

Hey @rfay, can you help me with that ...

I followed steps from documention, but there is something wrong

Ubuntu, export BATS_LIB_PATH=/usr/bin/bats

 ✗ backdrop existing project with ddev version v1.23.5
   (from function `_common_setup' in file tests/common-setup.bash, line 6,
    from function `setup' in test file tests/backdrop.bats, line 6)
     `_common_setup' failed with status 127
   /home/sr/Schreibtisch/github/ddev/docs/tests/common-setup.bash: Zeile 6: bats_load_library: Befehl nicht gefunden

I guess you're doing local testing and you haven't installed bats-file, bats-assert, bats-support

If using homebrew they can be installed with brew

https://ddev.readthedocs.io/en/stable/developers/quickstart-maintenance/#automated-tests