Testing rendering of a given layout with RSpec & Rails

Question

Is it possible to test the use of a given layout using RSpec with Rails, for example I\'d like a matcher that does the following:

response.should use_layout(         


        

Answer 1

There's already a perfectly functional matcher for this:

response.should render_template(:layout => 'fooo')

(Rspec 2.6.4)

Answer 2

I had to write the following to make this work:

response.should render_template("layouts/some_folder/some_layout", "template-name")

Answer 3

Here's the solution I ended up going with. Its for rpsec 2 and rails 3.
I just added this file in the spec/support directory. The link is: https://gist.github.com/971342

# spec/support/matchers/render_layout.rb


ActionView::Base.class_eval do
  unless instance_methods.include?('_render_layout_with_tracking')
    def _render_layout_with_tracking(layout, locals, &block)
      controller.instance_variable_set(:@_rendered_layout, layout)
      _render_layout_without_tracking(layout, locals, &block)
    end
    alias_method_chain :_render_layout, :tracking
  end
end

# You can use this matcher anywhere that you have access to the controller instance,
# like in controller or integration specs.
#
# == Example Usage
#
# Expects no layout to be rendered:
#   controller.should_not render_layout
# Expects any layout to be rendered:
#   controller.should render_layout
# Expects app/views/layouts/application.html.erb to be rendered:
#   controller.should render_layout('application')
# Expects app/views/layouts/application.html.erb not to be rendered:
#   controller.should_not render_layout('application')
# Expects app/views/layouts/mobile/application.html.erb to be rendered:
#   controller.should_not render_layout('mobile/application')
RSpec::Matchers.define :render_layout do |*args|
  expected = args.first
  match do |c|
    actual = get_layout(c)
    if expected.nil?
      !actual.nil? # actual must be nil for the test to pass.  Usage: should_not render_layout
    elsif actual
      actual == expected.to_s
    else
      false
    end
  end

failure_message_for_should do |c|
    actual = get_layout(c)
    if actual.nil? && expected.nil?
      "expected a layout to be rendered but none was"
    elsif actual.nil?
      "expected layout #{expected.inspect} but no layout was rendered"
    else
      "expected layout #{expected.inspect} but #{actual.inspect} was rendered"
    end
  end

failure_message_for_should_not do |c|
    actual = get_layout(c)
    if expected.nil?
      "expected no layout but #{actual.inspect} was rendered"
    else
      "expected #{expected.inspect} not to be rendered but it was"
    end
  end

def get_layout(controller)
    if template = controller.instance_variable_get(:@_rendered_layout)
      template.virtual_path.sub(/layouts\//, '')
    end
  end
end

Answer 4

controller.active_layout.name works for me.

Answer 5

response.should render_template("layouts/some_folder/some_layout") response.should render_template("template-name")