Migrate to Scala Library

lib/build.gradle.kts

@@ -1,8 +1,8 @@
-import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
-
 plugins {
-    kotlin("jvm") version "1.4.10"
+    // Apply the scala Plugin to add support for Scala.
+    scala
 
+    // Apply the java-library plugin for API and implementation separation.
     `java-library`
 }
 
@@ -10,15 +10,27 @@ group = "tribufu"
 version = "0.0.1"
 
 repositories {
+    // Use Maven Central for resolving dependencies.
     mavenCentral()
 }
 
 dependencies {
-    testImplementation(kotlin("test-junit"))
-}
+    // Use Scala 2.13 in our library project
+    implementation("org.scala-lang:scala-library:2.13.3")
 
-tasks.test {
-    useJUnit()
+    // This dependency is used internally, and not exposed to consumers on their own compile classpath.
+    implementation("com.google.guava:guava:30.0-jre")
+
+    // Use Scalatest for testing our library
+    testImplementation("junit:junit:4.13.1")
+    testImplementation("org.scalatest:scalatest_2.13:3.2.3")
+    testImplementation("org.scalatestplus:junit-4-13_2.13:3.2.2.0")
+
+    // Need scala-xml at test runtime
+    testRuntimeOnly("org.scala-lang.modules:scala-xml_2.13:1.2.0")
+
+    // This dependency is exported to consumers, that is to say found on their compile classpath.
+    api("org.apache.commons:commons-math3:3.6.1")
 }
 
 tasks.jar {
@@ -26,7 +38,3 @@ tasks.jar {
         attributes(mapOf("Implementation-Title" to project.name, "Implementation-Version" to project.version))
     }
 }
-
-tasks.withType<KotlinCompile>() {
-    kotlinOptions.jvmTarget = "1.8"
-}

lib/src/main/scala/tribufu/Library.scala

@@ -2,17 +2,17 @@
 
 package tribufu
 
-class TribuFu {
+class Library {
+    init()
+
+    private def init(){
+        // Used to load the 'TribuFu' library on application startup.
+        //System.loadLibrary("TribuFu")
+    }
+
     /**
      * A native method that is implemented by the 'TribuFu' native library, which is packaged with
      * this library.
      */
-    // external fun Hello(): Int
-
-    companion object {
-        // Used to load the 'TribuFu' library on application startup.
-        init {
-            //System.loadLibrary("TribuFu")
-        }
-    }
+    //@native def Hello(): Int
 }

lib/src/test/scala/tribufu/LibrarySuite.scala

@@ -0,0 +1,16 @@
+// Copyright (c) TribuFu. All Rights Reserved
+
+package tribufu
+
+import org.junit.runner.RunWith
+import org.scalatest.funsuite.AnyFunSuite
+import org.scalatestplus.junit.JUnitRunner
+
+@RunWith(classOf[JUnitRunner])
+class LibrarySuite extends AnyFunSuite {
+    test("Hello is always true") {
+        //def library = new Library()
+        //assert(library.Hello())
+        assert(true)
+    }
+}