dotty.tools.dotc.CompilationTests fail on Windows

[melekhove]

The issue is most likely related to different class path separator.

Testing tests\run\virtpatmat_valdef.scala
java.nio.file.InvalidPathException: Illegal char <:> at index 138: D:\home\projects\Scala\Dotty\git\library\..\out\bootstrap\dotty-library-bootstrapped\scala-0.10\dotty-library_0.10-0.10.0-bin-SNAPSHOT.jar:D:\home\projects\Scala\Dotty\git\out\runTestFromTasty\run\weakconform
	at sun.nio.fs.WindowsPathParser.normalize(WindowsPathParser.java:182)
	at sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:153)
	at sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:77)
	at sun.nio.fs.WindowsPath.parse(WindowsPath.java:94)
	at sun.nio.fs.WindowsFileSystem.getPath(WindowsFileSystem.java:255)
	at java.nio.file.Paths.get(Paths.java:84)
	at dotty.tools.io.Directory$.apply(Directory.scala:32)
	at dotty.tools.io.AbstractFile$.getDirectory(AbstractFile.scala:25)
	at dotty.tools.dotc.classpath.ClassPathFactory.$anonfun$classesInPathImpl$1(ClassPathFactory.scala:58)
	at scala.collection.immutable.List.flatMap(List.scala:335)
	at dotty.tools.dotc.classpath.ClassPathFactory.classesInPathImpl(ClassPathFactory.scala:55)
	at dotty.tools.dotc.classpath.ClassPathFactory.classesInExpandedPath(ClassPathFactory.scala:44)
	at dotty.tools.dotc.config.PathResolver$Calculated$.basis(PathResolver.scala:234)
	at dotty.tools.dotc.config.PathResolver$Calculated$.containers$lzycompute(PathResolver.scala:238)
	at dotty.tools.dotc.config.PathResolver$Calculated$.containers(PathResolver.scala:238)
	at dotty.tools.dotc.config.PathResolver.containers(PathResolver.scala:261)
	at dotty.tools.dotc.config.PathResolver.result$lzycompute(PathResolver.scala:264)
	at dotty.tools.dotc.config.PathResolver.result(PathResolver.scala:263)
	at dotty.tools.dotc.config.JavaPlatform.classPath(JavaPlatform.scala:18)
	at dotty.tools.dotc.config.JavaPlatform.rootLoader(JavaPlatform.scala:38)
	at dotty.tools.dotc.core.Contexts$ContextBase.rootLoader(Contexts.scala:602)

I'm trying to fix it but the problem is that it's hard to do that w/o debug and I can't debug it from IJ Idea.
It either couldn't find test classes or fails for some other reasons.

Does someone know how to run/debug such tests from IJ Idea?