Reorganize feature specs for MR notes

spec/features/merge_requests/user_sees_system_notes_spec.rb

+require 'spec_helper'
+
+feature 'Merge requests > User sees system notes' do
+  let(:public_project) { create(:project, :public) }
+  let(:private_project) { create(:project, :private) }
+  let(:issue) { create(:issue, project: private_project) }
+  let(:merge_request) { create(:merge_request, source_project: public_project, source_branch: 'markdown') }
+  let!(:note) { create(:note_on_merge_request, :system, noteable: merge_request, project: public_project, note: "mentioned in #{issue.to_reference(public_project)}") }
+
+  context 'when logged-in as a member of the private project' do
+    before do
+      user = create(:user)
+      private_project.add_developer(user)
+      login_as(user)
+    end
+
+    it 'shows the system note' do
+      visit namespace_project_merge_request_path(public_project.namespace, public_project, merge_request)
+
+      expect(page).to have_css('.system-note')
+    end
+  end
+
+  context 'when not logged-in' do
+    it 'hides the system note' do
+      visit namespace_project_merge_request_path(public_project.namespace, public_project, merge_request)
+
+      expect(page).not_to have_css('.system-note')
+    end
+  end
+end