improve rule to handle more than one test class matching impl class

[mslowiak]

This will improve the existing rule to test that test classes reside in the same package as their implementation. In particular the rule

1. Should not fail if there are multiple test classes with the same simple name as long as one test class resides in the correct package
2. Should fail if none of multiple test classes matching by name with implementation class are in correct package

Resolves #918

[codecholeric]

Thanks a lot for taking care of this so quickly 😃 Looks good to me, just a couple of minor nitpicks you could look into.

[codecholeric]

Ah, one more thing, could you also make sure that each commit message header is not longer than 70 chars? So GitHub doesn't break it over? And it would be cool, if you could put the details from the PR description into the commit message as details as well. Because I want to keep a clean Git history that is self-explanatory and does not depend on GitHub as a platform for further context.

[mslowiak]

Ah, one more thing, could you also make sure that each commit message header is not longer than 70 chars? So GitHub doesn't break it over? And it would be cool, if you could put the details from the PR description into the commit message as details as well. Because I want to keep a clean Git history that is self-explanatory and does not depend on GitHub as a platform for further context.

Thanks for explaining point of view. I adjusted the PR according to comments 🚀

[codecholeric]

Looks very good now, thanks a lot!! 😃