Cleanup tests

[allanrenucci]

• Remove std lib blacklist
• Factor out some code

[allanrenucci]

Blocked on #5433

[odersky]

Why not wait for 2.13 collections instead? I mean the situation with 2.12 is both acceptable and temporary, so why bother changing it now? I agree that #5433 needs to be addressed.

[allanrenucci]

Why not wait for 2.13 collections instead? I mean the situation with 2.12 is both acceptable and temporary, so why bother changing it now? I agree that #5433 needs to be addressed.

I am not sure to understand your comment. This PR is unrelated to #5433. It is a little refactoring in the test infrastructure. It just happen to change the compilation order in some tests which now fail

[smarter]

Nice simplification! While you're at it, could you try moving the sources in a different package than package scala ? We're only interested in testing that these files still compile and not in actually using them as the real standard library (since we'll switch to 2.13 at some point anyway), therefore using a different package avoids interaction between these files and the symbols the compiler load (in particular, it should allow us to completely get rid of the blacklist).

[allanrenucci]

Nice simplification! While you're at it, could you try moving the sources in a different package than package scala ?

Can this be done in a separate PR. I probably won't have time to do that in the near future and I don't think it should block this PR

[smarter]

Can this be done in a separate PR. I probably won't have time to do that in the near feature and I don't think it should block this PR

Sure.