def METHOD_NAME(self):
    self.input_str = textwrap.dedent("""
    2014-01-01 open Assets:Investments:Cash
    2014-01-01 open Assets:Investments:Stock
    2014-06-22 * "Add some positive units"
      Assets:Investments:Stock    1 HOOL {500 USD}
      Assets:Investments:Cash  -500 USD
    2014-06-23 * "Down to zero"
      Assets:Investments:Stock   -1 HOOL {500 USD}
      Assets:Investments:Cash   500 USD
    2014-06-24 * "Go negative from zero"
      Assets:Investments:Stock   -1 HOOL {500 USD}
      Assets:Investments:Cash   500 USD
    2014-06-25 * "Go positive much"
      Assets:Investments:Stock    11 HOOL {500 USD}
      Assets:Investments:Cash  -5500 USD
    2014-06-26 * "Cross to negative from above zero"
      Assets:Investments:Stock  -15 HOOL {500 USD}
      Assets:Investments:Cash  7500 USD
    """)