tests are mad

src/main/java/com/zipcodewilmington/generic/group/Group.java

@@ -13,7 +13,7 @@ import java.util.stream.Collectors;
  * @author leon on 06/12/2018.
  */
 public class Group<TypeOfId extends Serializable,
-        TypeOfEntity extends IdentifiableInterface> extends AbstractGroup{
+        TypeOfEntity extends IdentifiableInterface<TypeOfId>> extends AbstractGroup<TypeOfId, TypeOfEntity>{
 
     public Group() {
     }
@@ -25,7 +25,7 @@ public class Group<TypeOfId extends Serializable,
 
     @Override
     public void insert(IdentifiableInterface object) {
-        group.add(object);
+        group.add((TypeOfEntity) object);
     }
 
     @Override
@@ -64,12 +64,11 @@ public class Group<TypeOfId extends Serializable,
     }
 
     @Override
-    public List filter(Predicate predicate) {
+    public List<TypeOfEntity> filter(Predicate<TypeOfEntity> predicate) {
 
-        return null;
-//                group.stream()
-//                .filter(predicate)
-//                .collect(Collectors.toList());
+        return group.stream()
+                .filter(predicate)
+                .collect(Collectors.toList());
     }
 
     @Override