Using 'render_views' while writing controller specs.

_header.html.haml

/ app/views/shared/_header.html.haml
 
= render 'users/links'

index.html.haml

/ app/views/users/index.html.haml
 
= render 'shared/header'
- @users.each |user|
  = user.name
  = user.email
 
= render 'shared/footer'

users_controllers_spec.rb

# specs/controllers/users_controllers_spec.rb
 
# Initially while writing controller specs, I was writing them as follows
require 'spec_helper'
 
describe UsersController do
  it "should get users list" do
    get :index
    assigns[:users].blank?.should == false
  end
end
 
# In above test case, only 'app/views/users/index.html.haml' will be rendered & 
# nested partials such as 'shared/header', 'shared/footer' & 'users/links' will not be renderd
 
# hence if there is any error in any of those nested partials will not be catched by above test case
# in order to render nested partials in a test case we should use 'render_views' as follows
require 'spec_helper'
 
describe UsersController do
  render_views
  
  it "should get users list" do
    get :index
    assigns[:users].blank?.should == false
  end
end