def myassert(cond : => Boolean) = {
  try {
    assert(cond)
  } catch { 
    case _ : Throwable => System.exit(1)
  }
}

myassert(get_first_price("GOOG", 1980) == None)

myassert(get_first_price("GOOG", 2010) == Some(312.204773))