scala - How do I start a server before running a test suite in SBT? -

problem if test in test <<= (taska, taskb) { (a, b) => dofinally b or test in test := (taskb dependson taska).value , taska forked, sbt execution doesn't continue taskb , get's stuck indefinitely. it's caused dofinally/dependson, because makes single-threaded sequential execution. can't find other way order 2 tasks, make them run sequentially.

so far i've gotten far :

lazy val startserver = taskkey[unit]("start pingpong server before running scala-js tests")  lazy val jvm =      project.in(file("jvm"))         fork in (test, runmain) := true         startserver := {           (runmain in test).totask(" com.example.pingpong").value         }       )  lazy val js =     project.in(file("js"))        test in test <<= (startserver in project("jvm", file("jvm")), test in(test, fastoptstage)) {          (startserver, test) => startserver dofinally test        }      ) 

the sbt execution stops on task startserver spawns thread, daemon one. tried fork in startserver := true didn't help.

i tried dependson, blocks :

test in test := {   (test in(test, fastoptstage)).dependson(startserver in project("jvm", file("jvm"))).value } 

if not start server in main class pingpong, behaves expected. if this, works has random order of execution , don't know how enforce without dofinally.

test in test := {   (startserver in project("jvm", file("jvm"))).value   (test in(test, fastoptstage)).value } 

i think i'm gonna have try sbt-sequential or fork new process.

instead of dealing sbt can suggest more simple workaround. create class static method start server (it check server not yet started), , in each test explicitly start server. you'll need set "fork in test := true", run server in separate jvm , shutdown after tests finished.

i use approach starting embedded cassandra server integration tests

in case it's static method java, can same scala , companion object.

  override def beforeall() {     log.info(s"start embedded cassandra server")     embeddedcassandraserverhelper.startembeddedcassandra("/timeseries.yaml")   } 

and

public static void startembeddedcassandra(string yamlfile, string tmpdir) throws ttransportexception, ioexception, configurationexception {         if (cassandradaemon != null) {             /* nothing cassandra started */             return;         }       // ... start new server }