[CE] Support multiple assignees for merge requests

Backports https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/10161
(code out of ee/ folder).

2 files changed, 4 insertions, 3 deletions

diff --git a/spec/lib/gitlab/hook_data/issuable_builder_spec.rb b/spec/lib/gitlab/hook_data/issuable_builder_spec.rb
index 26529c4759d..569d5dcc757 100644
--- a/spec/lib/gitlab/hook_data/issuable_builder_spec.rb
+++ b/spec/lib/gitlab/hook_data/issuable_builder_spec.rb
@@ -97,13 +97,13 @@ describe Gitlab::HookData::IssuableBuilder do
     end
 
     context 'merge_request is assigned' do
-      let(:merge_request) { create(:merge_request, assignee: user) }
+      let(:merge_request) { create(:merge_request, assignees: [user]) }
       let(:data) { described_class.new(merge_request).build(user: user) }
 
       it 'returns correct hook data' do
         expect(data[:object_attributes]['assignee_id']).to eq(user.id)
-        expect(data[:assignee]).to eq(user.hook_attrs)
-        expect(data).not_to have_key(:assignees)
+        expect(data[:assignees].first).to eq(user.hook_attrs)
+        expect(data).not_to have_key(:assignee)
       end
     end
   end
diff --git a/spec/lib/gitlab/hook_data/merge_request_builder_spec.rb b/spec/lib/gitlab/hook_data/merge_request_builder_spec.rb
index 9ce697adbba..39f80f92fa6 100644
--- a/spec/lib/gitlab/hook_data/merge_request_builder_spec.rb
+++ b/spec/lib/gitlab/hook_data/merge_request_builder_spec.rb
@@ -10,6 +10,7 @@ describe Gitlab::HookData::MergeRequestBuilder do
     it 'includes safe attribute' do
       %w[
         assignee_id
+        assignee_ids
         author_id
         created_at
         description