Added mutation testing

.travis.yml

@@ -20,7 +20,8 @@ before_script:
   - docker-compose up -d
 
 script:
-  - mvn clean org.jacoco:jacoco-maven-plugin:prepare-agent install -Dskip.failsafe.tests sonar:sonar
+  - mvn org.pitest:pitest-maven:mutationCoverage
+  - mvn clean org.jacoco:jacoco-maven-plugin:prepare-agent test -Dskip.failsafe.tests sonar:sonar  -Dsonar.pitest.mode=reuseReport
   - docker exec springpetclinic_pet-clinic_1 mvn verify -Dskip.surefire.tests -q --batch-mode
 
 after_script:

pom.xml

@@ -156,6 +156,16 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.pitest</groupId>
+                <artifactId>pitest-maven</artifactId>
+                <version>1.2.0</version>
+                <configuration>
+                    <outputFormats>
+                        <outputFormat>XML</outputFormat>
+                    </outputFormats>
+                </configuration>
+            </plugin>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>