Use JUnit to run IDE tests

Author: Duhemm

.drone.yml

@@ -48,7 +48,7 @@ pipeline:
     image: lampepfl/dotty:2018-04-10
     commands:
       - cp -R . /tmp/4/ && cd /tmp/4/
-      - ./project/scripts/sbt dotty-language-server/test:run
+      - ./project/scripts/sbt dotty-language-server/test
 
   test_sbt:
     group: test

language-server/test/dotty/tools/languageserver/Main.scala

@@ -766,14 +766,13 @@ object Build {
       // fork so that the shutdown hook in Main is run when we ctrl+c a run
       // (you need to have `cancelable in Global := true` in your global sbt config to ctrl+c a run)
       fork in run := true,
+      fork in Test := true,
       libraryDependencies ++= Seq(
         "org.eclipse.lsp4j" % "org.eclipse.lsp4j" % "0.3.0",
         Dependencies.`jackson-databind`
       ),
       javaOptions := (javaOptions in `dotty-compiler-bootstrapped`).value,
 
-      test := {}, // Tests should be run with dotty-language-server/test:run
-
       run := Def.inputTaskDyn {
         val inputArgs = spaceDelimited("<arg>").parsed