Testing flash message method in application_helper.rb code in Rails -


i'm bit new test driven development, , want learn how cover code possible when make more complex apps in rails, i'll able prevent bugs introduced.

i have code in application_helper.rb styles flash messages twitter bootstrap classes , want write test code have written if changes i'll know before becomes bit issue.

#application_helper.rb module applicationhelper   def flash_class(type)     case type     when :alert       "alert-error"     when :notice       "alert-info"     else       ""     end   end end

my application.html.erb view has following code show flash message using helper method above.

#application.html.erb <% flash.each |type, message| %>   <div class="alert <%= flash_class type %>">     <button type="button" class="close" data-dismiss="alert">&times;</button>     <%= message %>   </div> <% end %>

what type of test write test code in application_helper.rb works, , how go writing test? i'm using shoulda-context gem test writing, don't care if tests written in standard rails test_with_lots_of_underscores style.

i using cloud9 write application ruby 1.9.3 (patch level 327) , rails 3.2.13. repoosiroty app i'm working on in github repository

how this:

class applicationhelpertest < test::unit::testcase   context "flash_class"      should "map :alert symbol 'alert-error' string"       assert_equal 'alert-error', flash_class(:alert)     end      should "map :notice symbol 'alert-info' string"       assert_equal 'alert-info', flash_class(:notice)     end      should "map else empty string"       assert_equal '', flash_class(:blah)     end    end end

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