View_context in specs

Testing RSpec
1

I have a presenter class which is instantiated like this:

class Blah

def initialize(context)
@context = context
end

def do_something_view_related
@context.render :partial => “/…somewhere”
end

def do_something_else_view_related
@context.content_tag :p, “fancy paragraph”
end

end

class BlahController < ApplicationController

def blah
@blah = Blah.new(view_context)
end

end

…

I’ve gotten around this in my specs by doing something like:

describe Blah do

it “is blaherrific” do
context = stub(:render => “some content…”, :link_to => "somewhere)
blah = Blah.new(context)

blah.do_someting_view_related.should == "some content..."

end

end

But I would much rather actually be able to call upon the real view
context in
my specs so that my tests are more realistic.

Is the best way to get a real-world view context in there to do
something like:

Blah.new(ActionView::Base.new) ?

Or does RSpec have something magical already setup for this sort of
thing?

Muchas Gracias.

Patrick J. Collins
http://collinatorstudios.com

2

On Nov 2, 2011, at 9:46 PM, Patrick J. Collins wrote:

end
@blah = Blah.new(view_context)
it “is blaherrific” do
my specs so that my tests are more realistic.

Is the best way to get a real-world view context in there to do something like:

Blah.new(ActionView::Base.new) ?

Or does RSpec have something magical already setup for this sort of thing?

Nope. rspec-rails doesn’t know that you want to write presenters :slight_smile:

I’d say just go w/ the real deal.

HTH,
David

3

On Nov 2, 2011, at 9:52 PM, David C. wrote:

def do_something_view_related

describe Blah do

I’d say just go w/ the real deal.

I should qualify that: I’d say just start with the real deal. If it
turns out painful, then look for alternatives.

4

Is the best way to get a real-world view context in there to do something
like:

Blah.new(ActionView::Base.new) ?

Or does RSpec have something magical already setup for this sort of thing?

Nope. rspec-rails doesn’t know that you want to write presenters :slight_smile:

I’d say just go w/ the real deal.

Ok cool, thanks. It turns out ActionView::Base.new is a bit of a pain
to try to
use in this case since it lacks configuration of view paths and such.
So what
appears to be the simplest way to get this functionality is to do:

@context = ActionController::Base.new.view_context

then you can do @context.render, @context.content_tag, etc.

Patrick J. Collins
http://collinatorstudios.com

5

If you put this on your spec_helper.rb

//If you have your spec in the directory “spec/presenters”
config.include ActionView::TestCase::Behavior, example_group:
{file_path: %r{spec/presenters}}

Then you can use a method, :view, that you can use as the view context
like this

let(:profile) { ProfilePresenter.new(@user, view) }

… There is a Railscast about it.