How do I run both ScalaTest and JUnit tests with Gradle?

Question

I've got a mixed Java / Scala project with both JUnit and ScalaTest tests. With the scalatest plugin, Gradle runs the ScalaTest tests in src/test/scala, but ignores the JUnit tests in src/test/java. Without the plugin, Gradle runs the JUnit tests but ignores the Scala. What trick am I missing?

My build.gradle:

plugins {
  id 'java'
  id 'maven'
  id 'scala'
  id "com.github.maiflai.scalatest" version "0.6-5-g9065d91"
}

sourceCompatibility = 1.8

group = 'org.chrononaut'
version = '1.0-SNAPSHOT'

task wrapper(type: Wrapper) {
    gradleVersion = '2.3'
}

ext {
    scalaMajorVersion = '2.11'
    scalaVersion = "${scalaMajorVersion}.5"
}

repositories {
    mavenCentral()
    mavenLocal()
}

dependencies {
    compile "org.scala-lang:scala-library:${scalaVersion}"
    compile "org.scala-lang.modules:scala-xml_${scalaMajorVersion}:1.0.3"
    compile 'com.google.guava:guava:18.0'
    compile 'javax.xml.bind:jaxb-api:2.2.12'
    compile 'jaxen:jaxen:1.1.6'
    compile 'joda-time:joda-time:2.7'
    compile 'org.joda:joda-convert:1.7'
    compile 'org.apache.commons:commons-lang3:3.3.2'
    compile 'org.jdom:jdom2:2.0.5'

    testCompile 'junit:junit:4.12'
    testCompile 'org.easytesting:fest-assert:1.4'
    testCompile 'org.mockito:mockito-core:1.10.19'
    testCompile "org.scalatest:scalatest_${scalaMajorVersion}:2.2.4"
    testRuntime 'org.pegdown:pegdown:1.1.0' // required by scalatest plugin
}

compileScala {
    scalaCompileOptions.additionalParameters = [
            "-feature",
            "-language:reflectiveCalls", // used for config structural typing
            "-language:postfixOps"
    ]
}

---

ETA: I know it's possible to annotate Scala tests to force them to run with the JUnit test runner. I'm looking for a one-stop build.gradle solution that doesn't require editing every test file (or messing with the tests to get around limitations in the build system, in general).

Answer 1

Another alternative to running with JUnit (and to creating an Ant task as suggested in comments) - is creating a task that runs ScalaTest's Runner directly:

task scalaTest(dependsOn: ['testClasses'], type: JavaExec) {
  main = 'org.scalatest.tools.Runner'
  args = ['-R', 'build/classes/test', '-o']
  classpath = sourceSets.test.runtimeClasspath
}

test.dependsOn scalaTest // so that running "test" would run this first, then the JUnit tests

Answer 2

1. Get rid of the plugin, as it makes test task to run ScalaTest only (so JUnit gets ignored).
2. Annotate your ScalaTests with @RunWith(classOf[JUnitRunner])so they can be run by gradle as JUnit tests.

Answer 3

With the latest version of scala-test plugin you can choose whether the existing (junit)-test task is replaced or not by the scala-tests-task. In your case you could use the following in

gradle.properties:

com.github.maiflai.gradle-scalatest.mode = append

Now you can execute both tests:

• junit: gradle test
• scala-test: gradle scalatest

or combine them into one task

task allTests {
    dependsOn test
    dependsOn scalatest
}

That worked for me.