Trying to get ScalaTest working: “There are no tests to run” when doing “mvn test”

Question

Edit: I finally got it to work!!!

It needed a combination of JUnit in the pom.xml, and three statements in my .scala:

import org.junit.runner.RunWith         


        

Answer 1

Adding to Blake's answer, besides @RunWith(classOf[JUnitRunner]) you might also need to set the surefire as follows:

  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>2.12</version>
    <configuration>
      <includes>
        <include>**/*Suite.class</include>
        <include>**/*Test.class</include>
        <include>**/*Tests.class</include>
        <include>**/*Spec.class</include>
        <include>**/*Specs.class</include>
      </includes>
    </configuration>
  </plugin>

Here's one of my Maven projects which tests just fine by ScalaTest without any special plugin: https://github.com/nikita-volkov/sext/

Answer 2

If you're running on Maven, then you'll either have to annotate your test class(es) with

@RunWith(classOf[JUnitRunner])

This would require you having JUnit as a dependency. Or you could use the ScalaTest Maven Plugin (haven't used it myself though).

Answer 3

You might want to use the scalatest-maven-plugin to run your scala tests.

Also make sure that you use the <scope>test</scope> for jars needed only for test purposes.

This is how I have defined my pom.xml for using ScalaTest:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.stackoverflow</groupId>
    <artifactId>Q13036561</artifactId>
    <version>1.0-SNAPSHOT</version>

    <name>${project.artifactId}-${project.version}</name>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <scala.version>2.9.2</scala.version>
        <scalatest.version>2.0.M4</scalatest.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-library</artifactId>
            <version>${scala.version}</version>
        </dependency>
        <dependency>
            <groupId>org.scalatest</groupId>
            <artifactId>scalatest_${scala.version}</artifactId>
            <version>${scalatest.version}</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.scala-tools</groupId>
                <artifactId>maven-scala-plugin</artifactId>
                <version>2.15.2</version>
                <executions>
                    <execution>
                        <id>scala-compile</id>
                        <goals>
                            <goal>compile</goal>
                            <goal>testCompile</goal>
                        </goals>
                        <configuration>
                            <args>
                                <arg>-make:transitive</arg>
                                <arg>-dependencyfile</arg>
                                <arg>${project.build.directory}/.scala_dependencies</arg>
                            </args>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <!--
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.7.2</version>
                <executions>
                    <execution>
                        <id>default-test</id>
                        < ! - Disable the default-test by putting it in phase none - >
                        <phase>none</phase>
                    </execution>
                </executions>
            </plugin>
            -->
            <plugin>
                <groupId>org.scalatest</groupId>
                <artifactId>scalatest-maven-plugin</artifactId>
                <version>1.0-M2</version>
                <configuration>
                    <reportsDirectory>${project.build.directory}/surefire-reports</reportsDirectory>
                    <stdout>W</stdout> <!-- Skip coloring output -->
                </configuration>
                <executions>
                    <execution>
                        <id>scala-test</id>
                        <goals>
                            <goal>test</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

As you can see I have also added a section that disables the surefire plugin if you really don't want to run it. It is commented in the above pom but if you want to disable the surefire plugin just uncomment that part.

I am using IntelliJ too and there are no problems at all with this combination. Just run the tests from within IntelliJ or by using mvn test, they will both work.