Zmiana nazwy z Remove na Delete, dodanie testu na usuwanie.

Signed-off-by: Marcin Woźniak <y0rune@aol.com>

buisnesslogic/src/main/java/com/plannaplan/services/CourseService.java

@@ -25,7 +25,7 @@ public class CourseService {
         this.repo.save(course);
     }
 
-    public void remove(Course course){
+    public void delete(Course course){
         this.repo.delete(course);
     }