Added JaCoCo tests and worked on a code smell

pom.xml

@@ -91,6 +91,12 @@
 				<artifactId>maven-surefire-plugin</artifactId>
 				<version>2.22.2</version>
 			</plugin>
+
+			<plugin>
+				<groupId>org.jacoco</groupId>
+				<artifactId>jacoco-maven-plugin</artifactId>
+				<version>0.8.8-SNAPSHOT</version>
+			</plugin>
 		</plugins>
 	</build>
 </project>

src/main/java/beamline/utils/EventUtils.java

@@ -23,6 +23,10 @@ public class EventUtils {
 
 	private static final XFactory xesFactory = new XFactoryNaiveImpl();
 	
+	private EventUtils() {
+		throw new IllegalStateException("Utility class");
+	}
+	
 	/**
 	 * Creates a new {@link XTrace} referring to one event
 	 * 

src/test/java/beamline/tests/FiltersTests.java

@@ -21,8 +21,6 @@ import io.reactivex.rxjava3.core.Observable;
 
 public class FiltersTests {
 
-	EventUtils e = new EventUtils();
-	
 	@Test
 	public void test_exclude_activities_on_name_filter() {
 		List<String> results = new ArrayList<String>();