Relative paths forced in getMessingExpectedErrors

Author: anatoliykmetyuk

compiler/test/dotty/tools/vulpix/ParallelTesting.scala

@@ -423,7 +423,6 @@ trait ParallelTesting extends RunnerOrchestration { self =>
       }
 
     protected def compile(files0: Array[JFile], flags0: TestFlags, suppressErrors: Boolean, targetDir: JFile): TestReporter = {
-
       val flags = flags0.and("-d", targetDir.getPath)
         .withClasspath(targetDir.getPath)
 
@@ -686,7 +685,9 @@ trait ParallelTesting extends RunnerOrchestration { self =>
 
     def getMissingExpectedErrors(errorMap: HashMap[String, Integer], reporterErrors: Iterator[MessageContainer]) = !reporterErrors.forall { error =>
       val key = if (error.pos.exists) {
-        val fileName = error.pos.source.file.toString
+        def toRelative(path: String): String =  // For some reason, absolute paths leak from the compiler itself...
+          path.split("/").dropWhile(_ != "tests").mkString("/")
+        val fileName = toRelative(error.pos.source.file.toString)
         s"$fileName:${error.pos.line}"
 
       } else "nopos"