A brief description of The Tennis-Kata can be found here.
https://sammancoaching.org/kata_descriptions/tennis.html
You should create your own branch and try to resolve it.
run maven clean compile to get dependencies.
the kata code contains A TennisTest class which represents the specification of the "application".
The compilation failed, therefore, All Tests failed as well.
You must create your own classes so that tests would run successfully.
You can comment some tests when coding, but after finishing, all test data must be kept as before.