Adding test in Scala in app module (#12)

Unit testing in Scala instead of Java, needs new Scala Android Plugin version and Gradle 8.13

Author: mcallisto

README.md

@@ -20,7 +20,7 @@ This is the Scala project you get if:
 
 ## Notes
 
-### Why Scala 3.7.0-RC2?
+### Why Scala 3.7.0?
 
 Because is the first Scala version shipping https://github.com/scala/scala3/pull/22632.
 The emitted Scala code is more compatible with Android ART.

app/src/test/java/com/example/scala_3_android_java/ExampleUnitTest.java

@@ -0,0 +1,29 @@
+package com.example.scala_3_android_java
+
+import com.example.core.Foo
+import org.junit.Test
+import org.junit.Assert.*
+
+import scala.jdk.javaapi.OptionConverters
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ScalaUnitTest {
+
+  @Test
+  def addition_isCorrect(): Unit = {
+    assertEquals(4, 2 + 2)
+  }
+
+  @Test def integer_fromScalaCore(): Unit = {
+    assertEquals(42, Foo.bar)
+  }
+
+  @Test def converted_option_fromScalaCore(): Unit = {
+    assertEquals(42, OptionConverters.toJava(Foo.option).get)
+  }
+
+}

app/src/test/scala/com/example/scala_3_android_java/ScalaUnitTest.scala

@@ -8,7 +8,7 @@ material = "1.12.0"
 constraintlayout = "2.2.1"
 lifecycleLivedataKtx = "2.8.7"
 lifecycleViewmodelKtx = "2.8.7"
-scalaAndroidPlugin = "24.1019.1546"
+scalaAndroidPlugin = "25.0412.2039"
 scala3Library_x = "3.7.0-RC2"
 
 [libraries]

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 #Sun Mar 09 20:26:37 CET 2025
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists