example.rb

given "logged in" do
  login
end

given "anonymous" do end

describe "Homepage: url(:home)", :given => "logged in" do
  before(:each) do
    @rack = request(:home)
  end
  
  it "allows the user to visit" do
    @rack.should be_successful
    @rack.body.should == "Welcome"
  end
  
  it "returns an HTML page" do
    @rack.should have_content_type(:html)
  end
end

describe "Homepage: url(:home)", :given => "anonymous" do
  it "redirects the user to the login screen" do
    requesting(:home).should redirect_to(:get_login)
  end
end

output

Given logged in, Homepage: url(:home) allows the user to visit
Given logged in, Homepage: url(:home) returns an HTML page
Given anonymous, Homepage: url(:home) redirects the user to the login screen