[tests, debugger, testing support] Reuse the Scala Compile Server when running debugger and testing support tests

Author: vasilmkd

scala/compiler-integration/test/org/jetbrains/plugins/scala/compiler/ScalaExecutionTestCase.scala

@@ -3,11 +3,13 @@ package org.jetbrains.plugins.scala.compiler
 import com.intellij.debugger.impl.OutputChecker
 import com.intellij.execution.ExecutionTestCase
 import com.intellij.execution.configurations.JavaParameters
+import com.intellij.openapi.application.ApplicationManager
 import com.intellij.openapi.diagnostic.Logger
 import com.intellij.openapi.projectRoots.Sdk
 import com.intellij.openapi.vfs.LocalFileSystem
 import com.intellij.pom.java.LanguageLevel
 import com.intellij.testFramework.EdtTestUtil
+import com.intellij.testFramework.common.ThreadLeakTracker
 import org.jetbrains.plugins.scala.base.libraryLoaders.{HeavyJDKLoader, LibraryLoader, ScalaSDKLoader, SmartJDKLoader}
 import org.jetbrains.plugins.scala.base.{ScalaSdkOwner, SourceRootTestUtil}
 import org.jetbrains.plugins.scala.extensions.PathExt
@@ -74,6 +76,8 @@ trait ScalaExecutionTestCase extends ExecutionTestCase with ScalaSdkOwner {
 
   override protected def getTestProjectJdk: Sdk = SmartJDKLoader.getOrCreateJDK(testProjectJdkVersion)
 
+  protected def reuseCompileServerProcessBetweenTests: Boolean = true
+
   override protected def setUpModule(): Unit = {
     super.setUpModule()
     EdtTestUtil.runInEdtAndWait { () =>
@@ -104,7 +108,17 @@ trait ScalaExecutionTestCase extends ExecutionTestCase with ScalaSdkOwner {
 
   override protected def tearDown(): Unit = {
     try {
-      CompileServerLauncher.stopServerAndWait()
+      if (reuseCompileServerProcessBetweenTests) {
+        //noinspection ApiStatus,UnstableApiUsage
+        ThreadLeakTracker.longRunningThreadCreated(
+          ApplicationManager.getApplication,
+          "BaseDataReader: output stream of scalaCompileServer",
+          "BaseDataReader: error stream of scalaCompileServer",
+          "scalaCompileServer"
+        )
+      } else {
+        CompileServerLauncher.stopServerAndWait()
+      }
       EdtTestUtil.runInEdtAndWait { () =>
         disposeLibraries(getModule)
       }