1. Name your source directories properly:
<project><build>
<sourceDirectory>src/main/scala</sourceDirectory>
<testSourceDirectory>src/test/scala</testSourceDirectory>
</build></project>
2. Add the scala-tools.org repositories.
These are required in order to download the necessary Scala dependencies (see step #3):
<project>
<repositories>
<repository>
<id>scala-tools.org</id>
<name>Scala-tools Maven2 Repository</name>
<url>http://scala-tools.org/repo-releases</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>scala-tools.org</id>
<name>Scala-tools Maven2 Repository</name>
<url>http://scala-tools.org/repo-releases</url>
</pluginRepository>
</pluginRepositories>
</project>
3. Add the appropriate dependencies:
<project><dependencies>
<!--
This contains the scala compiler, which Maven will use to compile your code and run your unit tests.
-->
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.7.7</version>
</dependency>
<!--
This is Scala's unit testing framework. It's also possible to use JUnit, but when in Rome, right?
-->
<dependency>
<groupId>org.scalatest</groupId>
<artifactId>scalatest</artifactId>
<version>1.0</version>
<scope>test</scope>
</dependency>
<!--
If you want to use scalatest, unfortunately you also need to include JUnit as a dependency (see step #5).
-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.1</version>
<scope>test</scope>
</dependency>
<dependencies></project>
4. Add the scala-tools plugin:
<project><build><plugins>
<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins></build></projects>
5. Add the @RunWith annotation to each unit test.
If you are using scalatest as your unit testing framework, you must trick Maven into thinking that your tests are JUnit tests. Otherwise, Maven will not run your tests:
import org.junit.runner.RunWith
import org.scalatest.junit.JUnitRunner
import org.scalatest.FunSuite
@RunWith(classOf[JUnitRunner])
class MyScalaTest extends FunSuite{
//...
}
Tip: If you're using Eclipse, you can right click on one of these unit tests and select "Run As > JUnit Test" to manually run the test.
