Add jacoco-maven-plugin (w.i.p.)

`mvn clean test jacoco:report` still fails for check, so this part is disabled.

Signed-off-by: Stefan Weil <[email protected]>

pom.xml

@@ -1106,6 +1106,11 @@ from system library in Java 11+ -->
                         </dependency>
                     </dependencies>
                 </plugin>
+                <plugin>
+                    <groupId>org.jacoco</groupId>
+                    <artifactId>jacoco-maven-plugin</artifactId>
+                    <version>0.8.10</version>
+                </plugin>
                 <plugin>
                   <groupId>com.github.spotbugs</groupId>
                   <artifactId>spotbugs-maven-plugin</artifactId>
@@ -1169,6 +1174,47 @@ from system library in Java 11+ -->
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
             </plugin>
+            <plugin>
+                <groupId>org.jacoco</groupId>
+                <artifactId>jacoco-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>prepare-agent</id>
+                        <goals>
+                            <goal>prepare-agent</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>report</id>
+                        <phase>test</phase>
+                        <goals>
+                            <goal>report</goal>
+                        </goals>
+                    </execution>
+<!-- check disabled because it will fail until better coverage is realized
+                    <execution>
+                        <id>jacoco-check</id>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                        <configuration>
+                            <rules>
+                                <rule>
+                                    <element>PACKAGE</element>
+                                    <limits>
+                                        <limit>
+                                            <counter>LINE</counter>
+                                            <value>COVEREDRATIO</value>
+                                            <minimum>0.50</minimum>
+                                        </limit>
+                                    </limits>
+                                </rule>
+                            </rules>
+                        </configuration>
+                    </execution>
+-->
+                </executions>
+            </plugin>
         </plugins>
     </build>