show.html.erb

<span id="business_name"><%= @business.name %></span>

show.html.erb_spec.rb

describe "business #show in HTML" do
  it "should render the business name" do
    assigns[:business] = Factory(:business, :name => 'Foo Bar')
    render 'businesses/show'
    response.should have_tag('span#business_name', 'Foo Bar')
  end
end