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

myassert(get_january_data("GOOG", 1980) == List())

myassert(get_january_data("GOOG", 2010).head == "2010-01-04,312.204773")