public void TimesFail() { var mountfs = new MountFileSystem(); Assert.Throws <FileNotFoundException>(() => mountfs.SetCreationTime("/toto.txt", DateTime.Now)); Assert.Throws <FileNotFoundException>(() => mountfs.SetLastAccessTime("/toto.txt", DateTime.Now)); Assert.Throws <FileNotFoundException>(() => mountfs.SetLastWriteTime("/toto.txt", DateTime.Now)); }