When I press build, I don’t want the native testing environment to be built, because obviously it will fail. When I press test, I don’t want the Arduino environments to be tested, because obviously they will fail This is impossible apparently? default_envs applies to both [image] builds fail […

You’re not using the right folder structure at all, so tests are not correctly recognized. See reference project and documentation . When I order the project files as [grafik] And, same as the reference project, use test_ignore to not make uni environment execute the native tests, using the platf…