Increase the timeout a bit for the Windows CI.

Author: sjrd

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

@@ -57,6 +57,8 @@ trait ParallelTesting extends RunnerOrchestration { self =>
   /** Tests should override the checkfiles with the current output */
   def updateCheckFiles: Boolean
 
+  def testSuiteTimeoutInMinutes: Int = 20
+
   /** A test source whose files or directory of files is to be compiled
    *  in a specific way defined by the `Test`
    */
@@ -654,7 +656,7 @@ trait ParallelTesting extends RunnerOrchestration { self =>
 
         pool.shutdown()
 
-        if (!pool.awaitTermination(20, TimeUnit.MINUTES)) {
+        if (!pool.awaitTermination(testSuiteTimeoutInMinutes, TimeUnit.MINUTES)) {
           val remaining = new ListBuffer[TestSource]
           filteredSources.lazyZip(eventualResults).foreach { (src, res) =>
             if (!res.isDone)

sjs-compiler-tests/test/scala/dotty/tools/dotc/ScalaJSCompilationTests.scala

@@ -24,6 +24,8 @@ class ScalaJSCompilationTests extends ParallelTesting {
   def testFilter = Properties.testsFilter
   def updateCheckFiles: Boolean = Properties.testsUpdateCheckfile
 
+  override def testSuiteTimeoutInMinutes = 30 // for the Windows CI
+
   // Negative tests ------------------------------------------------------------
 
   @Test def negScalaJS: Unit = {