public void Verify_Permission_Inversion()
{
var p0 = new FsPermission("rwx");
Assert.AreEqual(7, p0.Integer);
Assert.AreEqual(true, p0.Read);
Assert.AreEqual(true, p0.Write);
Assert.AreEqual(true, p0.Execute);
var p1 = p0.Invert();
Assert.AreEqual(0, p1.Integer);
Assert.AreEqual(false, p1.Read);
Assert.AreEqual(false, p1.Write);
Assert.AreEqual(false, p1.Execute);
}