Add can_merge option to autocomplete response

It's used only if merge_request_iid param is provided

1 files changed, 30 insertions, 0 deletions

diff --git a/spec/serializers/user_serializer_spec.rb b/spec/serializers/user_serializer_spec.rb
new file mode 100644
index 00000000000..2e4a8c644fe
--- /dev/null
+++ b/spec/serializers/user_serializer_spec.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe UserSerializer do
+  let(:user1) { create(:user) }
+  let(:user2) { create(:user) }
+
+  context 'serializer with merge request context' do
+    let(:merge_request) { create(:merge_request) }
+    let(:project) { merge_request.project }
+    let(:serializer) { described_class.new(merge_request_iid: merge_request.iid) }
+
+    before do
+      allow(project).to(
+        receive_message_chain(:merge_requests, :find_by_iid!)
+          .with(merge_request.iid).and_return(merge_request)
+      )
+
+      project.add_maintainer(user1)
+    end
+
+    it 'returns a user with can_merge option' do
+      serialized_user1, serialized_user2 = serializer.represent([user1, user2], project: project).as_json
+
+      expect(serialized_user1).to include("id" => user1.id, "can_merge" => true)
+      expect(serialized_user2).to include("id" => user2.id, "can_merge" => false)
+    end
+  end
+end