Fix tests

taiga/projects/api.py

@@ -372,7 +372,7 @@ class ProjectViewSet(LikedResourceMixin, HistoryResourceMixin,
         try:
             user = user_model.objects.get(id=user_id)
         except user_model.DoesNotExist:
-            return response.BadRequest(_("Project already have due dates"))
+            return response.BadRequest(_("The user doesn't exist"))
 
         # Check the user is a membership from the project
         if not project.memberships.filter(user=user).exists():

tests/integration/test_importer_api.py

@@ -237,9 +237,15 @@ def test_valid_project_import_with_extra_data(client):
         "task_statuses": [{
             "name": "Test"
         }],
+        "task_duedates": [{
+            "name": "Test"
+        }],
         "issue_statuses": [{
             "name": "Test"
         }],
+        "issue_duedates": [{
+            "name": "Test"
+        }],
     }
 
     response = client.json.post(url, json.dumps(data))
@@ -276,6 +282,7 @@ def test_invalid_project_import_without_roles(client):
     assert len(response.data) == 2
     assert Project.objects.filter(slug="imported-project").count() == 0
 
+
 def test_invalid_project_import_with_extra_data(client):
     user = f.UserFactory.create()
     client.login(user)