Railsにおけるリンクの記述方法とそのテスト ref: http://qiita.com/kidachi_/items/d704e7eb63513c3831ae

erb

<%= link_to "About", about_path %>

file0.html

<a href="/static_pages/about">About</a>

file11.txt

root_path => '/'
root_url  => 'http://localhost:3000/'

file12.txt

visit foo_path
click_link "var"

file7.txt

about_path -> '/about'
about_url  -> 'http://localhost:3000/about'

file9.txt

root  'controller_name#action_name'

routes.rb

SampleApp::Application.routes.draw do
  root  'static_pages#home'
  match '/help',    to: 'static_pages#help',    via: 'get'
  match '/about',   to: 'static_pages#about',   via: 'get'
  match '/contact', to: 'static_pages#contact', via: 'get'
  ~
end

static_pages_spec.rb

require 'spec_helper'

describe "Static pages" do
  ~
  it "should have the right links on the layout" do
    visit root_path
    click_link "About"
    expect(page).to have_title(full_title('About Us'))
    click_link "Help"
    expect(page).to have_title(full_title('Help'))
    click_link "Contact"
    expect(page).to have_title(full_title('Contact'))
    click_link "Home"
    expect(page).to have_title(full_title(''))
    click_link "Sign up now!"
    expect(page).to have_title(full_title('Sign up'))
    click_link "sample app"
    expect(page).to have_title(full_title(''))
  end
end