1 files changed, 91 insertions, 0 deletions
diff --git a/spec/lib/gitlab/issuable/clone/copy_resource_events_service_spec.rb b/spec/lib/gitlab/issuable/clone/copy_resource_events_service_spec.rb
new file mode 100644
index 00000000000..1700939f49e
--- /dev/null
+++ b/spec/lib/gitlab/issuable/clone/copy_resource_events_service_spec.rb
@@ -0,0 +1,91 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::Issuable::Clone::CopyResourceEventsService do
+  let_it_be(:user) { create(:user) }
+  let_it_be(:group) { create(:group) }
+  let_it_be(:project1) { create(:project, :public, group: group) }
+  let_it_be(:project2) { create(:project, :public, group: group) }
+  let_it_be(:new_issue) { create(:issue, project: project2) }
+  let_it_be_with_reload(:original_issue) { create(:issue, project: project1) }
+
+  subject { described_class.new(user, original_issue, new_issue) }
+
+  it 'copies the resource label events' do
+    resource_label_events = create_list(:resource_label_event, 2, issue: original_issue)
+
+    subject.execute
+
+    expected = resource_label_events.map(&:label_id)
+
+    expect(new_issue.resource_label_events.map(&:label_id)).to match_array(expected)
+  end
+
+  context 'with existing milestone events' do
+    let!(:milestone1_project1) { create(:milestone, title: 'milestone1', project: project1) }
+    let!(:milestone2_project1) { create(:milestone, title: 'milestone2', project: project1) }
+    let!(:milestone3_project1) { create(:milestone, title: 'milestone3', project: project1) }
+
+    let!(:milestone1_project2) { create(:milestone, title: 'milestone1', project: project2) }
+    let!(:milestone2_project2) { create(:milestone, title: 'milestone2', project: project2) }
+
+    before do
+      original_issue.update!(milestone: milestone2_project1)
+
+      create_event(milestone1_project1)
+      create_event(milestone2_project1)
+      create_event(nil, 'remove')
+      create_event(milestone3_project1)
+    end
+
+    it 'copies existing resource milestone events' do
+      subject.execute
+
+      new_issue_milestone_events = new_issue.reload.resource_milestone_events
+      expect(new_issue_milestone_events.count).to eq(3)
+
+      expect_milestone_event(
+        new_issue_milestone_events.first, milestone: milestone1_project2, action: 'add', state: 'opened'
+      )
+      expect_milestone_event(
+        new_issue_milestone_events.second, milestone: milestone2_project2, action: 'add', state: 'opened'
+      )
+      expect_milestone_event(
+        new_issue_milestone_events.third, milestone: nil, action: 'remove', state: 'opened'
+      )
+    end
+
+    def create_event(milestone, action = 'add')
+      create(:resource_milestone_event, issue: original_issue, milestone: milestone, action: action)
+    end
+
+    def expect_milestone_event(event, expected_attrs)
+      expect(event.milestone_id).to eq(expected_attrs[:milestone]&.id)
+      expect(event.action).to eq(expected_attrs[:action])
+      expect(event.state).to eq(expected_attrs[:state])
+    end
+  end
+
+  context 'with existing state events' do
+    let!(:event1) { create(:resource_state_event, issue: original_issue, state: 'opened') }
+    let!(:event2) { create(:resource_state_event, issue: original_issue, state: 'closed') }
+    let!(:event3) { create(:resource_state_event, issue: original_issue, state: 'reopened') }
+
+    it 'copies existing state events as expected' do
+      subject.execute
+
+      state_events = new_issue.reload.resource_state_events
+      expect(state_events.size).to eq(3)
+
+      expect_state_event(state_events.first, issue: new_issue, state: 'opened')
+      expect_state_event(state_events.second, issue: new_issue, state: 'closed')
+      expect_state_event(state_events.third, issue: new_issue, state: 'reopened')
+    end
+
+    def expect_state_event(event, expected_attrs)
+      expect(event.issue_id).to eq(expected_attrs[:issue]&.id)
+      expect(event.state).to eq(expected_attrs[:state])
+    end
+  end
+end