Harden partest against duplicate paths.

A serious issue: partest would launch the same test multiple
times if a test path was given in multiple forms (e.g. absolute
and relative paths.) Unfortunately all those tests would share
the same logfile, output directory, etc. which would predictably
lead to explosions.

Since overwriting classfiles while being loaded can lead to
jvm core dumps, it's possible this is involved in recent jvm
crashes and other test breakdowns.

This commit also alters the default partest verbosity to only
full print test transcripts under --verbose.

2 files changed, 15 insertions, 6 deletions

diff --git a/src/partest/scala/tools/partest/nest/ConsoleRunner.scala b/src/partest/scala/tools/partest/nest/ConsoleRunner.scala
index 5717aabb6a..8161e53bf9 100644
--- a/src/partest/scala/tools/partest/nest/ConsoleRunner.scala
+++ b/src/partest/scala/tools/partest/nest/ConsoleRunner.scala
@@ -13,6 +13,7 @@ import scala.tools.nsc.util.CommandLineParser
 import scala.collection.{ mutable, immutable }
 import PathSettings.srcDir
 import TestKinds._
+import scala.reflect.internal.util.Collections.distinctBy
 
 class ConsoleRunner extends DirectRunner {
   import NestUI._
@@ -67,11 +68,17 @@ class ConsoleRunner extends DirectRunner {
       val message   = passFail + elapsed
 
       if (failed0.nonEmpty) {
-        echo(bold(cyan("##### Transcripts from failed tests #####\n")))
-        failed0 foreach { state =>
-          comment("partest " + state.testFile)
-          echo(state.transcriptString + "\n")
+        if (isPartestVerbose) {
+          echo(bold(cyan("##### Transcripts from failed tests #####\n")))
+          failed0 foreach { state =>
+            comment("partest " + state.testFile)
+            echo(state.transcriptString + "\n")
+          }
         }
+
+        def files_s = failed0.map(_.testFile).mkString(""" \""" + "\n  ")
+        echo("# Failed test paths (this command will update checkfiles)")
+        echo("test/partest --update-check \\\n  " + files_s + "\n")
       }
 
       echo(message)
@@ -185,8 +192,8 @@ class ConsoleRunner extends DirectRunner {
 
     chatty(banner)
 
-    val allTests   = (miscTests ++ (kinds flatMap testsFor)).distinct
-    val grouped    = (allTests groupBy kindOf).toList sortBy (x => standardKinds indexOf x._1)
+    val allTests: List[Path] = distinctBy(miscTests ++ kindsTests)(_.toCanonical) sortBy (_.toString)
+    val grouped              = (allTests groupBy kindOf).toList sortBy (x => standardKinds indexOf x._1)
 
     totalTests = allTests.size
     expectedFailures = propOrNone("partest.errors") match {
diff --git a/src/reflect/scala/reflect/internal/util/Collections.scala b/src/reflect/scala/reflect/internal/util/Collections.scala
index 51b2f9f4e4..e127d577e1 100644
--- a/src/reflect/scala/reflect/internal/util/Collections.scala
+++ b/src/reflect/scala/reflect/internal/util/Collections.scala
@@ -209,3 +209,5 @@ trait Collections {
     case _: IllegalArgumentException => None
   }
 }
+
+object Collections extends Collections