2014-05-01 * Opening balance
    Assets:Cash          $100
    Equity:Opening balance

2014-05-10 * Spend money
    Expenses:Foo          $10
    Assets:Cash          -$10 = $80

test bal -> 1
__ERROR__
While parsing file "$FILE", line 8:
While parsing posting:
  Assets:Cash          -$10 = $80
                              ^^^
Error: Balance assertion off by $-10 (expected to see $90)
end test