Add jacoco for test coverage reporting in loader (#167)

Author: testower

gbfs-validator-java-loader/pom.xml

@@ -21,6 +21,9 @@
         <junit.version>6.0.0</junit.version>
         <wiremock.version>3.0.1</wiremock.version>
         <mockito.version>5.20.0</mockito.version>
+        <jacoco-maven-plugin.version>0.8.13</jacoco-maven-plugin.version>
+        <!-- empty argLine property, the value is set up by Jacoco during unit tests execution -->
+        <argLine></argLine>
     </properties>
 
     <dependencies>
@@ -67,4 +70,38 @@
         </dependency>
     </dependencies>
 
+    <build>
+        <plugins>
+            <!-- Jacoco for code coverage -->
+            <plugin>
+                <groupId>org.jacoco</groupId>
+                <artifactId>jacoco-maven-plugin</artifactId>
+                <version>${jacoco-maven-plugin.version}</version>
+                <executions>
+                    <execution>
+                        <id>default-prepare-agent</id>
+                        <goals>
+                            <goal>prepare-agent</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>default-report</id>
+                        <phase>prepare-package</phase>
+                        <goals>
+                            <goal>report</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>default-check</id>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                        <configuration>
+                            <rules />
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
 </project>