Fix debug main class in test scope

modules/sbt-plugin/src/main/scala/ch/epfl/scala/debugadapter/sbtplugin/DebugAdapterPlugin.scala

@@ -123,6 +123,7 @@ object DebugAdapterPlugin extends sbt.AutoPlugin {
    * }}}
    */
   def testSettings: Seq[Def.Setting[_]] = Seq(
+    startMainClassDebugSession := mainClassSessionTask.evaluated,
     startTestSuitesDebugSession := testSuitesSessionTask(convertFromArrayToTestSuites).evaluated,
     startTestSuitesSelectionDebugSession := testSuitesSessionTask(convertToTestSuites).evaluated,
     startRemoteDebugSession := remoteSessionTask.evaluated,

modules/sbt-plugin/src/sbt-test/debug-session/test-main-class/build.sbt

@@ -0,0 +1,10 @@
+import ch.epfl.scala.debugadapter.testfmk._
+
+val checkDebugSession = inputKey[Unit]("Check the main class debug session")
+
+scalaVersion := "2.12.14"
+checkDebugSession := {
+  val uri = (Test / startMainClassDebugSession).evaluated
+  val source = (Test / sources).value.head.toPath
+  DebugTest.check(uri)(Breakpoint(source, 5))
+}

modules/sbt-plugin/src/sbt-test/debug-session/test-main-class/project/plugins.sbt

@@ -0,0 +1,12 @@
+val pluginVersion = sys.props
+  .get("plugin.version")
+  .getOrElse {
+    sys.error(
+      """|The system property 'plugin.version' is not defined.
+         |Specify this property using the scriptedLaunchOpts -D.
+         |""".stripMargin
+    )
+  }
+
+addSbtPlugin("ch.epfl.scala" % "sbt-debug-adapter" % pluginVersion)
+libraryDependencies += "ch.epfl.scala" %% "scala-debug-adapter-test" % pluginVersion

modules/sbt-plugin/src/sbt-test/debug-session/test-main-class/project/project/plugins.sbt

@@ -0,0 +1,2 @@
+// required for adopt@1.8
+addSbtPlugin("org.scala-debugger" % "sbt-jdi-tools" % "1.1.1")

modules/sbt-plugin/src/sbt-test/debug-session/test-main-class/src/test/scala/example/Main.scala

@@ -0,0 +1,7 @@
+package example
+
+object Main {
+  def main(args: Array[String]): Unit = {
+    println("Hello, World!")
+  }
+}

modules/sbt-plugin/src/sbt-test/debug-session/test-main-class/test

@@ -0,0 +1,2 @@
+> 'checkDebugSession {"class":"example.Main","arguments":[],"jvmOptions":[]}'
+> stopDebugSession