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cache_assertion_method.rb

def assert_cache_works(key, procs)                                                                  
  #code that creates cache                                                                          
  procs[:cache].call                                                                                
  assert Rails.cache.exist?(key)                                                                    
  #code that should clear the cache                                                                 
  procs[:clear].call                                                                                
  assert !Rails.cache.exist?(key)                                                                   
end