code coverage report in commons module

.gitlab-ci.yml

@@ -21,6 +21,7 @@ test_frontend:
 test_backend 1 15:
   image: maven:3.6.0-jdk-8
   stage: test
+  coverage: '/(\d+.\d+) \% covered/'
   script:
 #xvfb is for X11 connection used by some parts of the java code: https://stackoverflow.com/a/47575851/1127920
     - apt-get update
@@ -30,6 +31,7 @@ test_backend 1 15:
 
     - mvn -DskipTests=true clean install -pl commons -am
     - mvn test -pl commons
+    - awk -F"," '{ instructions += $4 + $5; covered += $5 } END { print covered, "/", instructions, "instructions covered"; print 100*covered/instructions,"% covered" }' target/site/jacoco/jacoco.csv
 
 test_backend 2 15:
   image: maven:3.6.0-jdk-8

pom.xml

@@ -173,6 +173,25 @@
 					<surefire.rerunFailingTestsCount>4</surefire.rerunFailingTestsCount>
 				</configuration>
 			</plugin>
+			<plugin>
+        <groupId>org.jacoco</groupId>
+        <artifactId>jacoco-maven-plugin</artifactId>
+        <version>0.7.9</version>
+        <executions>
+          <execution>
+            <goals>
+             <goal>prepare-agent</goal>
+            </goals>
+          </execution>
+          <execution>
+            <id>generate-code-coverage-report</id>
+            <phase>test</phase>
+            <goals>
+              <goal>report</goal>
+            </goals>
+          </execution>
+         </executions>
+       </plugin>
 		</plugins>
 	</build>