4.x: Enable parallel TestNG run

Author: akarnokd

build.gradle

@@ -192,7 +192,9 @@ tasks.register('testNG', Test) {
     // Tell it to use TestNG explicitly
     useTestNG()
 
-    maxParallelForks = 1
+    maxHeapSize = "1200m"
+    maxParallelForks = Runtime.runtime.availableProcessors().intdiv(2) ?: 1
+    // maxParallelForks = 1
 
     // Ensure JUnit-compatible XML output in the standard location
     reports {