return value of python function using while true statement

I am trying to pass a string value to a while loop, but the won't return the updated string, what am I doing wrong?

  def test(str):
        random stuff
        while True:
              if(test 1 passes):
                    break
              else:
                    more random stuff
                    if(test 2 passes):
                          break
                    else:
                          tests didn't work
                          test(str)
               break
       return str