Added permissions feature spec

ee/spec/features/projects/issues/design_management/user_permissions_upload_spec.rb

+require 'spec_helper'
+
+describe 'User design permissions', :js do
+  let(:project) { create(:project_empty_repo, :public) }
+  let(:issue) { create(:issue, project: project) }
+
+  before do
+    stub_licensed_features(design_management: true)
+
+    visit project_issue_path(project, issue)
+
+    click_link 'Designs'
+
+    wait_for_requests
+  end
+
+  it 'user does not have permissions to upload design' do
+    expect(page).not_to have_field('design_file')
+  end
+end