I arrived to a legacy project where multiple files are developed in Java and many others in Kotlin. I have be able to configure Pitest to execute the mutation test and i have a correct report.
Now I would like to execute the mutation test only over the Kotlin files.
I tried to use the <targetClasses> but the param expresion is able to include certain packages, but I didn't discover a way to include certain types of files only.
I also tried to use the <excludedClasses> to add there a Java identificator that exclude this type of files, but again it doesn't work.
Do you know a way to use the targetClasses or the excludedClasses to let the kotlin files only in the scope of the Pitest execution?
Thank you in advance.
There is no built in way to limit mutation to only kotlin files. You would need to implement an mutation interceptor.
https://pitest.org/quickstart/advanced/
Or use the exclusions functionality provided by the arcmutate extentions to ignore files with a .java extension.