Restore partest and enable it to run alongside new partest

Author: felixmulder

.drone.yml

@@ -36,3 +36,7 @@ matrix:
   TEST:
     - ;test;dotty-bin-tests/test
     - ;publishLocal;dotty-bootstrapped/test
+    - partest-only-no-bootstrap --show-diff --verbose
+    - partest-only --show-diff --verbose
+    - ;set testOptions := Seq() ;testOnly dotty.tools.dotc.CompilationTests
+    - ;publishLocal ;set testOptions := Seq() ;dotty-bootstrapped/test

.drone.yml.sig

@@ -1 +1 @@
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compiler/test/dotc/tests.scala

@@ -0,0 +1,40 @@
+package dotty.partest
+
+import scala.collection.JavaConversions._
+import scala.reflect.io.Path
+import java.io.File
+
+import scala.tools.partest.PartestDefaults
+
+
+/** Dotty Partest runs all tests in the provided testDirs located under
+  * testRoot. There can be several directories with pos resp. neg tests, as
+  * long as the prefix is pos/neg.
+  *
+  * Each testDir can also have a __defaultFlags.flags file, which provides
+  * compiler flags and is used unless there's a specific flags file (e.g. for
+  * test pos/A.scala, if there's a pos/A.flags file those flags are used,
+  * otherwise pos/__defaultFlags.flags are used if the file exists).
+  */
+object DPConfig {
+  /** Options used for _running_ the run tests.
+   *  Note that this is different from the options used when _compiling_ tests,
+   *  those are determined by the sbt configuration.
+   */
+  val runJVMOpts = s"-Xms64M -Xmx1024M ${PartestDefaults.javaOpts}"
+
+  val testRoot = (Path("..") / Path("tests") / Path("partest-generated")).toString
+  val genLog = Path(testRoot) / Path("gen.log")
+
+  lazy val testDirs = {
+    val root = new File(testRoot)
+    val dirs = if (!root.exists) Array.empty[String] else root.listFiles.filter(_.isDirectory).map(_.getName)
+    if (dirs.isEmpty)
+      throw new Exception("Partest did not detect any generated sources")
+    dirs
+  }
+
+  // Tests finish faster when running in parallel, but console output is
+  // out of order and sometimes the compiler crashes
+  val runTestsInParallel = true
+}