check create_link from to same area added

src/antares/model/study.py

@@ -265,6 +265,9 @@ def create_link(
         properties: Optional[LinkProperties] = None,
         ui: Optional[LinkUi] = None,
     ) -> Link:
+        if area_from == area_to:
+            raise LinkCreationError(area_from, area_to, "A link cannot start and end at the same area")
+
         sorted_areas = sorted([area_from, area_to])
         area_from, area_to = sorted_areas
 

tests/antares/services/api_services/test_study_api.py

@@ -313,3 +313,20 @@ def test_create_link_unknown_area(self):
             match=f"Could not create the link {area_from} / {area_to}: {area_to} does not exist",
         ):
             self.study.create_link(area_from=area_from, area_to=area_to)
+
+    def test_create_link_same_area(self):
+        area = "area_1"
+
+        self.study._areas[area] = Area(
+            area,
+            self.study._area_service,
+            Mock(),
+            Mock(),
+            Mock(),
+        )
+
+        with pytest.raises(
+            LinkCreationError,
+            match=f"Could not create the link {area} / {area}: A link cannot start and end at the same area",
+        ):
+            self.study.create_link(area_from=area, area_to=area)