add sbt 2 cross build setting (sbt#191)

Author: xuwei-k

.github/workflows/ci.yml

@@ -76,7 +76,7 @@ jobs:
         run: sbt '++ ${{ matrix.scala }}' githubWorkflowCheck
 
       - shell: bash
-        run: sbt '++ ${{ matrix.scala }}' javafmtCheckAll test scripted
+        run: sbt '++ ${{ matrix.scala }}' javafmtCheckAll '+ test' scripted
 
       - name: Clean up Ivy Local repo
         shell: bash

build.sbt

@@ -57,7 +57,15 @@ lazy val plugin = (project in file("src/plugin"))
   .settings(
     commonSettings,
     name := "sbt-jupiter-interface",
-    Compile / scalacOptions ++= Seq("-Xlint", "-Xfatal-warnings"),
+    Compile / scalacOptions ++= Seq("-Xlint"),
+    Compile / scalacOptions ++= {
+      scalaBinaryVersion.value match {
+        case "2.12" =>
+          Seq("-Xfatal-warnings")
+        case _ =>
+          Nil
+      }
+    },
     scriptedBufferLog := false,
     scriptedLaunchOpts ++= Seq(
       s"-Dproject.version=${version.value}",
@@ -73,8 +81,10 @@ lazy val plugin = (project in file("src/plugin"))
     (pluginCrossBuild / sbtVersion) := {
       scalaBinaryVersion.value match {
         case "2.12" => "1.5.8"
+        case "3" => "2.0.0-RC6"
       }
     },
+    crossScalaVersions += "3.7.3"
   )
 
 lazy val root = (project in file("."))
@@ -116,7 +126,7 @@ ThisBuild / githubWorkflowBuildMatrixExclusions ++= {
     MatrixExclude(Map("scala" -> sv, "java" -> "temurin@17", "os" -> "windows-latest")),
   )
 }
-ThisBuild / githubWorkflowBuild := Seq(WorkflowStep.Sbt(List("javafmtCheckAll", "test", "scripted")))
+ThisBuild / githubWorkflowBuild := Seq(WorkflowStep.Sbt(List("javafmtCheckAll", "+ test", "scripted")))
 ThisBuild / githubWorkflowBuildPostamble += WorkflowStep.Run(
   commands = List("""rm -rf "$HOME/.ivy2/local""""),
   name = Some("Clean up Ivy Local repo")

src/plugin/src/main/scala-2/com/github/sbt/junit/jupiter/sbt/JupiterPluginCompat.scala

@@ -0,0 +1,12 @@
+package com.github.sbt.junit.jupiter.sbt
+
+import _root_.sbt.Def
+import _root_.sbt.Keys.*
+import _root_.sbt.Task
+import java.net.URL
+
+private[sbt] object JupiterPluginCompat {
+  val dependencyClasspathUrlArray: Def.Initialize[Task[Array[URL]]] = Def.task {
+    dependencyClasspath.value.map(_.data.toURI.toURL).toArray
+  }
+}

src/plugin/src/main/scala-3/com/github/sbt/junit/jupiter/sbt/JupiterPluginCompat.scala

@@ -0,0 +1,13 @@
+package com.github.sbt.junit.jupiter.sbt
+
+import _root_.sbt.Def
+import _root_.sbt.Keys.*
+import _root_.sbt.Task
+import java.net.URL
+
+private[sbt] object JupiterPluginCompat {
+  val dependencyClasspathUrlArray: Def.Initialize[Task[Array[URL]]] = Def.task {
+    val converter = fileConverter.value
+    dependencyClasspath.value.map(x => converter.toPath(x.data).toFile.toURI.toURL).toArray
+  }
+}

src/plugin/src/main/scala/com/github/sbt/junit/jupiter/sbt/JupiterPlugin.scala

@@ -96,7 +96,7 @@ object JupiterPlugin extends AutoPlugin {
    */
   private def collectTests = Def.task[Seq[TestDefinition]] {
     val classes = classDirectory.value
-    val classpath = dependencyClasspath.value.map(_.data.toURI.toURL).toArray :+ classes.toURI.toURL
+    val classpath = JupiterPluginCompat.dependencyClasspathUrlArray.value :+ classes.toURI.toURL
 
     val collector = new JupiterTestCollector.Builder()
       .withClassDirectory(classes)