Example test with capybara and factory girl

gistfile1.rb

describe "home page" do
  it "displays the user's username after successful login" do
    user = FactoryGirl.create(:user, :username => "jdoe", :password => "secret")
    visit "/login"
    fill_in "Username", :with => "jdoe"
    fill_in "Password", :with => "secret"
    click_button "Log in"

    page.should have_selector(".header .username", :text => "jdoe")
  end
end