Don't fork server tests

I was seeing some failures in travis ci where the build crashed because
it wasn't able to open a socket. This failure was happening in the
scalatest fork runner so I decided to avoid forking entirely. An
alternative approach would possibly be just to remove the scalatest
framework from the server test project but not forking is nicer anyway.

build.sbt

@@ -1075,7 +1075,7 @@ lazy val sbtProj = (project in file("sbt"))
   .configure(addSbtIO, addSbtCompilerBridge)
 
 lazy val serverTestProj = (project in file("server-test"))
-  .dependsOn(sbtProj % "test->test", scriptedSbtReduxProj % "test->test")
+  .dependsOn(sbtProj % "compile->test", scriptedSbtReduxProj % "compile->test")
   .settings(
     testedBaseSettings,
     crossScalaVersions := Seq(baseScalaVersion),
@@ -1086,15 +1086,26 @@ lazy val serverTestProj = (project in file("server-test"))
     Test / run / connectInput := true,
     Test / run / outputStrategy := Some(StdoutOutput),
     Test / run / fork := true,
-    Test / fork := true,
-    Test / javaOptions ++= {
-      val cp = (Test / fullClasspathAsJars).value.map(_.data).mkString(java.io.File.pathSeparator)
-      List(
-        s"-Dsbt.server.classpath=$cp",
-        s"-Dsbt.server.version=${version.value}",
-        s"-Dsbt.server.scala.version=${scalaVersion.value}",
-        s"-Dsbt.supershell=false",
-      )
+    Test / sourceGenerators += Def.task {
+      val rawClasspath =
+        (Compile / fullClasspathAsJars).value.map(_.data).mkString(java.io.File.pathSeparator)
+      val cp =
+        if (scala.util.Properties.isWin) rawClasspath.replaceAllLiterally("\\", "\\\\")
+        else rawClasspath
+      val content = {
+        s"""|
+            |package testpkg
+            |
+            |object TestProperties {
+            |  val classpath = "$cp"
+            |  val version = "${version.value}"
+            |  val scalaVersion = "${scalaVersion.value}"
+            |}
+          """.stripMargin
+      }
+      val file = (Test / target).value / "generated" / "src" / "test" / "scala" / "testpkg" / "TestProperties.scala"
+      IO.write(file, content)
+      file :: Nil
     },
   )
 

sbt/src/test/scala/sbt/RunFromSourceMain.scala

@@ -37,10 +37,10 @@ object RunFromSourceMain {
   ): Process = {
     val fo = fo0
       .withWorkingDirectory(workingDirectory)
-      .withRunJVMOptions(sys.props.get("sbt.ivy.home") match {
+      .withRunJVMOptions((sys.props.get("sbt.ivy.home") match {
         case Some(home) => Vector(s"-Dsbt.ivy.home=$home")
         case _          => Vector()
-      })
+      }) ++ fo0.runJVMOptions)
     implicit val runner = new ForkRun(fo)
     val options =
       Vector(workingDirectory.toString, scalaVersion, sbtVersion, cp.mkString(pathSeparator))

server-test/src/test/scala/testpkg/TestServer.scala

@@ -14,7 +14,7 @@ import java.util.concurrent.{ LinkedBlockingQueue, TimeUnit }
 import java.util.concurrent.atomic.AtomicBoolean
 
 import verify._
-import sbt.RunFromSourceMain
+import sbt.{ ForkOptions, OutputStrategy, RunFromSourceMain }
 import sbt.io.IO
 import sbt.io.syntax._
 import sbt.protocol.ClientSocket
@@ -43,18 +43,9 @@ trait AbstractServerTest extends TestSuite[Unit] {
       "server-test"
     )
     temp = base.toFile
-    val classpath = sys.props.get("sbt.server.classpath") match {
-      case Some(s: String) => s.split(java.io.File.pathSeparator).map(file)
-      case _               => throw new IllegalStateException("No server classpath was specified.")
-    }
-    val sbtVersion = sys.props.get("sbt.server.version") match {
-      case Some(v: String) => v
-      case _               => throw new IllegalStateException("No server version was specified.")
-    }
-    val scalaVersion = sys.props.get("sbt.server.scala.version") match {
-      case Some(v: String) => v
-      case _               => throw new IllegalStateException("No server scala version was specified.")
-    }
+    val classpath = TestProperties.classpath.split(File.pathSeparator).map(new File(_))
+    val sbtVersion = TestProperties.version
+    val scalaVersion = TestProperties.scalaVersion
     svr = TestServer.get(testDirectory, scalaVersion, sbtVersion, classpath, temp)
   }
   override def tearDownSuite(): Unit = {
@@ -169,7 +160,12 @@ case class TestServer(
   import TestServer.hostLog
 
   hostLog("fork to a new sbt instance")
-  val process = RunFromSourceMain.fork(baseDirectory, scalaVersion, sbtVersion, classpath)
+  val forkOptions =
+    ForkOptions()
+      .withOutputStrategy(OutputStrategy.StdoutOutput)
+      .withRunJVMOptions(Vector("-Dsbt.ci=true", "-Dsbt.io.virtual=false"))
+  val process =
+    RunFromSourceMain.fork(forkOptions, baseDirectory, scalaVersion, sbtVersion, classpath)
 
   lazy val portfile = baseDirectory / "project" / "target" / "active.json"