pom: enable jacoco code coverage

Acked-by: Paul Millar
Target: master

pom.xml

@@ -98,6 +98,11 @@
           <artifactId>maven-jar-plugin</artifactId>
           <version>${maven-jar-plugin.version}</version>
 	</plugin>
+        <plugin>
+            <groupId>org.jacoco</groupId>
+            <artifactId>jacoco-maven-plugin</artifactId>
+            <version>0.8.2</version>
+        </plugin>
       </plugins>
     </pluginManagement>
 
@@ -147,6 +152,44 @@
               </dependency>
           </dependencies>
       </plugin>
+      <plugin>
+          <groupId>org.jacoco</groupId>
+          <artifactId>jacoco-maven-plugin</artifactId>
+          <executions>
+              <!--
+                  Prepares the property pointing to the JaCoCo runtime agent which
+                  is passed as VM argument when Maven the Surefire plugin is executed.
+              -->
+              <execution>
+                  <id>pre-unit-test</id>
+                  <goals>
+                      <goal>prepare-agent</goal>
+                  </goals>
+                  <configuration>
+                      <!-- Sets the path to the file which contains the execution data. -->
+                      <destFile>${project.build.directory}/coverage-reports/jacoco-ut.exec</destFile>
+                  </configuration>
+              </execution>
+              <!--
+                  Ensures that the code coverage report for unit tests is created after
+                  unit tests have been run.
+              -->
+              <execution>
+                  <id>post-unit-test</id>
+                  <phase>test</phase>
+                  <goals>
+                      <goal>report</goal>
+                  </goals>
+                  <configuration>
+                      <!-- Sets the path to the file which contains the execution data. -->
+                      <dataFile>${project.build.directory}/coverage-reports/jacoco-ut.exec</dataFile>
+                      <!-- Sets the output directory for the code coverage report. -->
+                      <outputDirectory>${project.reporting.outputDirectory}/jacoco-ut</outputDirectory>
+                  </configuration>
+              </execution>
+          </executions>
+      </plugin>
+
     </plugins>
   </build>