> Thanks for the responses!
> 
> So to me it seems like Ruby/Rails controllers know about the model; 
> since Rails "stitches" the view, controllers and model together for you 
> I guess that makes sense.
> 
> A similar thing that is throwing me for a loop is something like this.
> 
>  test "should get index" do
>    get :index

This 'get' statement makes a request and gets the response.  All the other 
methods know about that response.  The details are hidden away...

>    assert_response :success
>    assert_select '#columns #side a' , :minimum => 4
>    assert_select '#main .entry' , 3
>    assert_select 'h3' , 'Programming Ruby 1.9'
>    assert_select '.price' , /\$[,\d]+\.\d\d/
>  end
> 
> This is a unit test from the book. The assert_select(s) test the html 
> response. But, this really confuses me because I see now response 
> anywhere?
> How in the world do the assert statements know of the HTML that was 
> generated?

See here for more...

http://guides.rubyonrails.org/testing.html


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