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require 'rubygems' |
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gem 'actionpack', '~>3.0.0' |
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gem 'activesupport', '~>3.0.0' |
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require 'action_pack' |
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require 'action_view' |
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require 'active_support' |
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require 'active_support/core_ext' |
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module ApplicationHelper |
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def does_things_with_content_tag |
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content_tag :p |
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end |
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def does_things_with_image_tag |
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image_tag 'a filename' |
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end |
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end |
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require 'ostruct' |
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class ViewlessHelpable |
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include ActionView::Helpers |
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include ApplicationHelper |
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ActionView::Helpers.constants.grep(/Helper$/i).each do |const| |
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include ActionView::Helpers.const_get(const) |
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end |
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def call |
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things = does_things_with_content_tag |
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raise things unless things == '<p></p>' |
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end |
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def invalid_without_config |
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things = begin |
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#image_tag requires config.asset_path |
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does_things_with_image_tag |
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rescue NameError => exc; |
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#=> NameError: undefined local variable or method ‘config’ for #<ViewlessHelpable:0x10157f880> |
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# method compute_public_path in asset_tag_helper.rb at line 742 |
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true |
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end |
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raise exc unless things |
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end |
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end |
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class ViewlessHelpableWithImages < ViewlessHelpable |
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def config |
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o =OpenStruct.new |
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o.asset_path = "a path" |
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o |
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end |
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def controller |
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Object.new |
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end |
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def call |
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super() |
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things = does_things_with_image_tag |
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raise things unless things == '<img alt="A path" src="a path" />' |
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end |
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end |
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require 'cgi' |
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class ViewlessHelpableWithImagePaths < ViewlessHelpable |
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def path_to_image(source) |
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"/images/#{CGI.escape(source)}" |
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end |
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def call |
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super() |
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things = does_things_with_image_tag |
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raise things unless things == '<img alt="A+filename" src="/images/a+filename" />' |
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end |
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end |
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ViewlessHelpable.new.call |
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ViewlessHelpable.new.invalid_without_config |
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ViewlessHelpableWithImages.new.call |
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ViewlessHelpableWithImagePaths.new.call |
