How do I write specs for Rails 3 view block helpers that use #with_output_buffer(&block)?

Testing RSpec
1

I found this:

it ‘should do something’ do
helper.some_block_helper { the_block_code }.should XXXX
end

but not sure how to use it

I have a module which is extended on top of ActiveView::Base

module MyViewExt
def area(clazz, &block)
content = with_output_buffer(&block)
content_tag :div, content, :class => clazz
end
end

How would I go about testing this in isolation, especially that the
effect of using #with_output_buffer(&block)
is as expected (especially when I have nested calls of view helpers
using this approach!).

Thanks.

2

I have finally come up with a workable solution

module MyViewHelper
def tab_for(clazz, &block)
content = with_output_buffer(&block)
content_tag :li, content, :class => clazz
end
end

module MyOtherViewHelper
…
end

describe “do it” do
it “works” do
ActionViewTester.tests MyViewHelper, MyOtherViewHelper
ActionViewTester.new do |helper|
helper.tab_for(‘kristian’) { ‘hello’ }.should match /kristian/
helper.hello(‘david’) { ‘hello’ }.should match /david/
end
end
end

On Aug 23, 4:04 pm, Kristian M. [email protected]

3

I packed it up into a useful reusable gem :wink:

Only these dependencies :slight_smile:

require ‘rspec’
require ‘action_view’
require ‘active_support/railtie’
require ‘action_view/template/handlers/erb’

Now allows for this DSL

describe “My ViewHelpers” do
it “should render content as expected” do
setup_action_view do
tests MyViewHelper, MyOtherViewHelper
end

with_action_view do |view|
  view.tab_for('kristian') { 'hello' }.should match /kristian/
  view.hello('david') { 'hello' }.should match /david/

  with_action_view do |view|
    view.with_template(%{
      <%= tab_for('kristian') { 'hello' } %>
    }).should match /hello/
end

end
end

Enjoy!

On Aug 23, 8:51 pm, Kristian M. [email protected]