public void Roundtrip_Rwx_Strings()
{
var p1 = new FsPermission("rwx");
Assert.AreEqual("rwx", p1.ToRwxString());
var p2 = new FsPermission("---");
Assert.AreEqual("---", p2.ToRwxString());
var p3 = new FsPermission(5);
Assert.AreEqual("r-x", p3.ToRwxString());
}