1 files changed, 23 insertions, 5 deletions
diff --git a/spec/support/shared_examples/graphql/mutations/set_assignees_shared_examples.rb b/spec/support/shared_examples/graphql/mutations/set_assignees_shared_examples.rb
index cfa12171b7e..022e2308517 100644
--- a/spec/support/shared_examples/graphql/mutations/set_assignees_shared_examples.rb
+++ b/spec/support/shared_examples/graphql/mutations/set_assignees_shared_examples.rb
@@ -10,22 +10,40 @@ RSpec.shared_examples 'an assignable resource' do
   describe '#resolve' do
     let_it_be(:assignee) { create(:user) }
     let_it_be(:assignee2) { create(:user) }
+
     let(:assignee_usernames) { [assignee.username] }
     let(:mutated_resource) { subject[resource.class.name.underscore.to_sym] }
+    let(:mode) { described_class.arguments['operationMode'].default_value }
 
-    subject { mutation.resolve(project_path: resource.project.full_path, iid: resource.iid, assignee_usernames: assignee_usernames) }
-
-    before do
-      resource.project.add_developer(assignee)
-      resource.project.add_developer(assignee2)
+    subject do
+      mutation.resolve(project_path: resource.project.full_path,
+                       iid: resource.iid,
+                       operation_mode: mode,
+                       assignee_usernames: assignee_usernames)
     end
 
     it 'raises an error if the resource is not accessible to the user' do
       expect { subject }.to raise_error(Gitlab::Graphql::Errors::ResourceNotAvailable)
     end
 
+    it 'does not change assignees if the resource is not accessible to the assignees' do
+      resource.project.add_developer(user)
+
+      expect { subject }.not_to change { resource.reload.assignee_ids }
+    end
+
+    it 'returns an operational error if the resource is not accessible to the assignees' do
+      resource.project.add_developer(user)
+
+      result = subject
+
+      expect(result[:errors]).to include a_string_matching(/Cannot assign/)
+    end
+
     context 'when the user can update the resource' do
       before do
+        resource.project.add_developer(assignee)
+        resource.project.add_developer(assignee2)
         resource.project.add_developer(user)
       end