Weird behaviour when trying to run a test about conman

[yogthos]

Actually, just checked your project.clj, and it looks like it's based off the older version of the template that uses lein-cprop plugin to generate the .lein-env config file. My recommendation would be to get rid of lein-cprop along with the :jvm-opts ["-server" "-Dconf=.lein-env"] at the top level, and create separate JVM opts for dev and testing profiles keeping the configs in files like dev-config.edn and test-config.edn.

[yogthos]

I think you might be missing the configuration for tests. Luminus sets up a project with separate configurations for development and testing. This is managed by the :jvm-opts key in the profiles. If you at the test profile in project.clj, it has the following line there: :jvm-opts ["-Dconf=test-config.edn"]. So, you should add the database URL for the test database there, and you should be able to run the tests either using lein test or with lein test-refresh which will watch the project for changes and run tests as needed.