require 'rails_helper' describe ApplicationHelper do describe 'active_nav_class' do it 'returns active when on the current page' do allow(helper).to receive(:current_page?).and_return(true) result = helper.active_nav_class("/test") expect(result).to eq "active" end it 'returns empty string when not on current page' do allow(helper).to receive(:current_page?).and_return(false) result = helper.active_nav_class("/test") expect(result).to eq "" end end end