add tests for empty label for workspace create/update

tracim/lib/core/workspace.py

 from sqlalchemy.orm import Session
 
 from tracim import CFG
+from tracim.exceptions import EmptyLabelNotAllowed
 from tracim.lib.utils.translation import fake_translator as _
 
 from tracim.lib.core.userworkspace import RoleApi
             save_now: bool=False,
     ) -> Workspace:
         if not label:
-            label = self.generate_label()
+            raise EmptyLabelNotAllowed('Workspace label cannot be empty')
 
         workspace = Workspace()
         workspace.label = label
         :param save_now: database flush
         :return: updated workspace
         """
+        if not label:
+            raise EmptyLabelNotAllowed('Workspace label cannot be empty')
         workspace.label = label
         workspace.description = description
 

tracim/tests/functional/test_workspaces.py

         assert workspace['description'] == 'mysuperdescription'
         assert len(workspace['sidebar_entries']) == 7
 
+    def test_api__update_workspace__err_400__empty_label(self) -> None:
+        """
+        Test update workspace with empty label
+        """
+        self.testapp.authorization = (
+            'Basic',
+            (
+                'admin@admin.admin',
+                'admin@admin.admin'
+            )
+        )
+        params = {
+            'label': '',
+            'description': 'mysuperdescription'
+        }
+        res = self.testapp.put_json(
+            '/api/v2/workspaces/1',
+            status=400,
+            params=params,
+        )
+
     def test_api__create_workspace__ok_200__nominal_case(self) -> None:
         """
         Test create workspace
         workspace_2 = res.json_body
         assert workspace == workspace_2
 
+    def test_api__create_workspace__err_400__empty_label(self) -> None:
+        """
+        Test create workspace with empty label
+        """
+        self.testapp.authorization = (
+            'Basic',
+            (
+                'admin@admin.admin',
+                'admin@admin.admin'
+            )
+        )
+        params = {
+            'label': '',
+            'description': 'mysuperdescription'
+        }
+        res = self.testapp.post_json(
+            '/api/v2/workspaces',
+            status=400,
+            params=params,
+        )
+
     def test_api__get_workspace__err_400__unallowed_user(self) -> None:
         """
         Check obtain workspace unreachable for user

tracim/views/core_api/workspace_controller.py

         return wapi.get_workspace_with_context(request.current_workspace)
 
     @hapic.with_api_doc(tags=[WORKSPACE_ENDPOINTS_TAG])
+    @hapic.handle_exception(EmptyLabelNotAllowed, HTTPStatus.BAD_REQUEST)
     @require_workspace_role(UserRoleInWorkspace.WORKSPACE_MANAGER)
     @hapic.input_path(WorkspaceIdPathSchema())
     @hapic.input_body(WorkspaceModifySchema())
         return wapi.get_workspace_with_context(request.current_workspace)
 
     @hapic.with_api_doc(tags=[WORKSPACE_ENDPOINTS_TAG])
+    @hapic.handle_exception(EmptyLabelNotAllowed, HTTPStatus.BAD_REQUEST)
     @require_profile(Group.TIM_MANAGER)
     @hapic.input_body(WorkspaceCreationSchema())
     @hapic.output_body(WorkspaceSchema())