public void Test1()
{
var file = new FileEmu();
Assert.IsFalse(file.Exists("aaa.txt"));
file.AddFile("aaa.txt", "あいうえお", Encoding.GetEncoding("shift-jis"));
Assert.IsTrue(file.Exists("aaa.txt"));
Assert.AreEqual("あいうえお", file.ReadAllText("aaa.txt", Encoding.GetEncoding("shift-jis")));
file.WriteAllText("aaa.txt", "かきくけこ", Encoding.GetEncoding("shift-jis"));
Assert.AreEqual("かきくけこ", file.ReadAllText("aaa.txt", Encoding.GetEncoding("shift-jis")));
}