Add clover plugin for coverage.
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-plugin-plugin</artifactId>
</plugin>
+ <plugin>
+ <groupId>org.openclover</groupId>
+ <artifactId>clover-maven-plugin</artifactId>
+ <version>4.3.1</version>
+ </plugin>
</plugins>
</build>
</project>
