Feature: delegate all open discussions to Issue

When a merge request can only be merged when all discussions are
resolved. This feature allows to easily delegate those discussions to a
new issue, while marking them as resolved in the merge request.

The user is presented with a new issue, prepared with mentions of all
unresolved discussions, including the first unresolved note of the
discussion, time and link to the note.

When the issue is created, the discussions in the merge request will get
a system note directing the user to the newly created issue.

1 files changed, 43 insertions, 0 deletions

diff --git a/spec/services/issues/create_service_spec.rb b/spec/services/issues/create_service_spec.rb
index 5c0331ebe66..8bde61ee336 100644
--- a/spec/services/issues/create_service_spec.rb
+++ b/spec/services/issues/create_service_spec.rb
@@ -136,5 +136,48 @@ describe Issues::CreateService, services: true do
     end
 
     it_behaves_like 'new issuable record that supports slash commands'
+
+    context 'for a merge request' do
+      let(:discussion) { Discussion.for_diff_notes([create(:diff_note_on_merge_request)]).first }
+      let(:merge_request) { discussion.noteable }
+      let(:project) { merge_request.source_project }
+      let(:opts) { { merge_request_for_resolving_discussions: merge_request } }
+
+      before do
+        project.team << [user, :master]
+      end
+
+      it 'resolves the discussion for the merge request' do
+        described_class.new(project, user, opts).execute
+        discussion.first_note.reload
+
+        expect(discussion.resolved?).to be(true)
+      end
+
+      it 'added a system note to the discussion' do
+        described_class.new(project, user, opts).execute
+
+        reloaded_discussion = MergeRequest.find(merge_request.id).discussions.first
+
+        expect(reloaded_discussion.last_note.system).to eq(true)
+      end
+
+      it 'assigns the title and description for the issue' do
+        issue = described_class.new(project, user, opts).execute
+
+        expect(issue.title).not_to be_nil
+        expect(issue.description).not_to be_nil
+      end
+
+      it 'can set nil explicityly to the title and description' do
+        issue = described_class.new(project, user,
+                                    merge_request_for_resolving_discussions: merge_request,
+                                    description: nil,
+                                    title: nil).execute
+
+        expect(issue.description).to be_nil
+        expect(issue.title).to be_nil
+      end
+    end
   end
 end