public void Test_Action()
{
var mbox = new MailBox ("Address");
var recv = 0;
mbox.Action += new MailBoxAction ((from, adress, letter) => {
recv += 1;
});
mbox.Action += new MailBoxAction ((from, adress, letter) => {
recv += 1;
});
// 登録済みアクションの起動
mbox.OnMailBox (null, "address", null);
Assert.AreEqual (2, recv);
}