Cannot run tests with build-helper-maven-plugin on a groovy project - maven

Question

I have a groovy project in Eclipse. I have to change from Gradle to Maven and now I cannot run the tests that exist in it.
Here is the structure of the project:
Here are the contents of the pom.xml:
<dependencies>
...
<dependency>
<groupId>org.spockframework</groupId>
<artifactId>spock-core</artifactId>
<version>1.0-groovy-2.4</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
<configuration>
<compilerId>groovy-eclipse-compiler</compilerId>
<compilerArguments>
<indy />
<!-- optional; supported by batch 2.4.12-04+ -->
...
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.12</version>
<executions>
<execution>
<id>add-source</id>
...
</execution>
<execution>
<id>add-test-source</id>
<phase>generate-test-sources</phase>
<goals>
<goal>add-test-source</goal>
</goals>
<configuration>
<sources>
<source>src/test/groovy</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
However, if I do a mvn clean install, the tests are not being ran.
Here is the output of the console:

Answer 1

The test cases we have are called Spec and not Test, this is fixed like this:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.0</version>
<configuration>
<includes>
<include>**/*Spec.class</include>
</includes>
</configuration>
</plugin>