[rspec-users] Stubbing #javascript_include_tag in a helper spec

[Nick Hoffman]

When writing specs for a helper method, how do you set an expectation  
for #javascript_include_tag ?

describe NeighbourhoodsHelper do
  describe '#initialise_map' do
    it 'should include the "foo" JS file' do
      # expectation here
      helper.foobar
    end
  end
end
I've tried replacing "# expectation here" with the following, but none  
of them result in the desired behaviour:

ActionView 
::Helpers::AssetTagHelper.should_receive :javascript_include_tag
@controller.should_receive :javascript_include_tag
@controller.instance_eval  
{ @template }.should_receive :javascript_include_tag

Thanks!
Nick
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