cucumber - How can I determine if a radio button is checked already? -

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I am using webrat with cucumber and I would like to test if a radio button is already being checked When i am on a page How can I do that? There was no move in Ibrat who could do that. 

  find_field ("radio_button_name"). May be checked

or in the new syntax: 

  Expected (find_field ("radio_button_name")). Check

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