PR's welcome! Clone the project and run ./gradlew build, it'll run all the tests and build all the jars.
One tricky thing is that testing inline snapshots requires changing the code being tested. To make this work, we have undertest projects. Their test task is disabled, and they have an underTest task instead. You'll note that every test in these projects is named UT_SomethingTest. That's because there is a corresponding SomethingTest in selfie-runner-junit5 , and SomethingTest works by changing the source code in UT_SomethingTest, running builds, and making assertions about the state of snapshots and source code after the build.