Add junit properties

src/main/kotlin/starter/modules/TemplateModule.kt

@@ -9,4 +9,5 @@ val templateModule = module {
     single { MainTemplate(get()) } bind Template::class
     single { LogbackTemplate(get()) } bind Template::class
     single { GitignoreTemplate(get()) } bind Template::class
+    single { JunitTemplate(get()) } bind Template::class
 }

src/main/kotlin/starter/templates/JunitTemplate.kt

@@ -0,0 +1,12 @@
+package starter.templates
+
+import com.mitchellbosecke.pebble.PebbleEngine
+import starter.Project
+import starter.utils.prettyPrintXml
+import starter.utils.render
+
+class JunitTemplate(private val engine: PebbleEngine) : Template {
+    override fun path(project: Project) = "src/test/resources/junit-platform.properties"
+    override fun enabled(project: Project) = project.dependencies.any { it.name == "junit" }
+    override fun render(project: Project) = engine.render("starter/junit/index")
+}

src/main/resources/starter/junit/index.twig

@@ -0,0 +1,4 @@
+junit.jupiter.testinstance.lifecycle.default=per_class
+junit.jupiter.execution.parallel.enabled=true
+junit.jupiter.execution.parallel.mode.default=same_thread
+junit.jupiter.execution.parallel.mode.classes.default=concurrent