[rspec-devel] [ rspec-Feature Requests-10262 ] Better Helper testing of Erb evaluation block helpers

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Feature Requests item #10262, was opened at 2007-04-20 16:12
You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=3152&aid=10262&group_id=797

>Category: rails plugin
Group: None
Status: Open
Priority: 3
Submitted By: Simon Nicholls (simon_nicholls)
>Assigned to: David Chelimsky (dchelimsky)
Summary: Better Helper testing of Erb evaluation block helpers

Initial Comment:
I'd like to easily test helpers which in views would be called like this:

<% helper_method "foo" do %>
bar
<% end %>

Erb eval blocks instead of Erb output blocks.

Including ActionView::Helpers::TextHelper in HelperBehaviourHelpers would help if you can add that, as it's generally useful.

I can then do something like this in the spec:

describe ApplicationHelper, "testing Erb eval helper" do
  before do
    @result = ERB.new("<% helper_method 'foo' do %>bar<% end %>").result(binding)
  end
  
  it "should work anyway but could be nicer" do
    @result.should == "foo..bar"
  end
end

Works well enough, but can you think of a nicer way?

I also tried a more direct, method calling style, but it needs explicit concat usage in the block:

_erbout = ''
panel('foo') { concat("bar", binding) }
@result = _erbout

Well, it works, but the block fudging and sneaky _erbout use is a bit naff

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>Comment By: David Chelimsky (dchelimsky)
Date: 2007-04-20 18:28

Message:
Cool. I've got this working but can't commit right now - will shortly.

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Comment By: Simon Nicholls (simon_nicholls)
Date: 2007-04-20 18:07

Message:
Hehe!

That's actually pretty nice when factored out!

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Comment By: David Chelimsky (dchelimsky)
Date: 2007-04-20 17:13

Message:
How about something like:

describe ApplicationHelper, "testing Erb eval helper" do
  before do
    @result = eval_erb("<% helper_method 'foo' do %>bar<% end %>")
  end
  
  it "should work anyway but could be nicer" do
    @result.should == "foo..bar"
  end
end

#eval_erb would basically wrap your original suggestion:

def eval_erb(text)
  ERB.new(text).result(binding)
end

The nice thing about this is that it not only serves your rails app, but you could use it like this:

eval_erb("Columbian").should == "really good s**t"

:)


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You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=3152&aid=10262&group_id=797