def METHOD_NAME(self):
    self.s["AA"] = "B"
    self.s["aa"] = "C"
    self.s["BB"] = "D"
    self.s["Aa"] = "E"
    self.s.write()
    self.s.reload()
    self.failUnlessEqual(set(self.s["aa"].split()), {"C", "B", "E"})