Run CI tests on Windows?

[Blaisorblade]

That could be necessary to support Windows, which seems a blocker for a Scala 3 release.
Conceivably we could use Appveyor for that — right now Lightbend uses instead Jenkins (since it does support Windows): https://scala-ci.typesafe.com/view/scala-2.12.x/job/scala-2.12.x-integrate-windows/.

[liufengyun]

For the binary release, we do have some basic CI for windows (as well as for OS X and Linux): https://github.com/lampepfl/packtest/blob/master/windows .

[SethTisue]

right now Lightbend uses instead Jenkins

it's historical, we probably ought to be on Appveyor, just like we're moving all the non-Windows things off Jenkins and onto Travis-CI.

[sjrd]

This was set up in #9647. However, only a small subset of tests are currently run. Basically just compiling a hello world with the bootstrapped dotc, and running the Scala.js JUnit tests. The full tests don't work on Windows at the moment, because all "neg" tests fail due to paths using \ instead of /, and hence the outputs don't match the check files.

[liufengyun]

Now sbt test and sbt dotty-bootstrapped/test are green in #9666, except for a few disabled tests that fail (search scala.util.Properties.isWin).

We still need to figure out the infrastructure to run the tests, as Appveyor has a one-hour limit and the free version only supports one concurrent job.

[liufengyun]

Fixed in #9934 and #9973 .