Scala Native comes with JUnit support out of the box. This means that you can write JUnit tests, in the same way you would do for a Java project.

To enable JUnit support, add the following lines to your build.sbt file:

libraryDependencies += "org.scala-native" %%% "junit-runtime" % "0.4.0"
addCompilerPlugin("org.scala-native" % "junit-plugin" % "0.4.0" cross CrossVersion.full)

If you want to get more detailed output from the JUnit runtime, also include the following line:

testOptions += Tests.Argument(TestFrameworks.JUnit, "-a", "-s", "-v")

Then, add your tests, for example in the src/test/scala/ directory:

import org.junit.Assert._
import org.junit.Test

class MyTest {
  @Test def superComplicatedTest(): Unit = {
    assertTrue("this assertion should pass", true)

Finally, run the tests in sbt by running test to run all tests. You may also use testOnly to run a particular test, for example:

testOnly MyTest
testOnly MyTest.superComplicatedTest