Make real Test for BO only

src/main/java/fr/eni/demo/bll/LocationService.java

@@ -1,17 +1,7 @@
 package fr.eni.demo.bll;
 
 import fr.eni.demo.bo.Location;
-import fr.eni.demo.dal.LocationRepository;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.stereotype.Service;
 
-@Service
-public class LocationService {
-
-  @Autowired
-  private LocationRepository locationRepository;
-
-  public void add(Location location) {
-    locationRepository.save(location);
-  }
+public interface LocationService {
+  void add(Location location);
 }