Permission service test addition

This mr adds unit tests for the permissionService

src/main/java/nl/tudelft/ewi/queue/service/PermissionService.java

@@ -294,6 +294,7 @@ public class PermissionService {
 		Course course = lab.getCourse();
 
 		return user.assists(course) ||
+				user.manages(course) ||
 				user.teaches(course);
 	}