The community license is contained in the tapir libraries and has not to be specified in any way. It is always used if no other license is found. If you have an own license, you can simply use it by adding it to your classpath root. For instance, add your tapir.license file into your src/test/resources folder for default Maven projects. You can also specify the license with the system property tapirLicenseFile.

Using a license for multiple test projects
If you want to provide multiple test projects with the same license, you should consider creating a new JAR file containing the tapir.license file. Your test projects can then use this JAR as dependency and tapir finds the license file automatically.