public void CompareTest()
{
var te = new TimeEntry(10, 40);
var te3 = new TimeEntry(10, 30);
var mte = new TimeEntry(-10, -40);
var dte = new TimeEntry(21, 20);
var te2 = new TimeEntry(3, 33);
Assert.AreEqual(true, dte == te + te);
Assert.AreEqual(true, te == te);
Assert.AreEqual(true, te >= te);
Assert.AreEqual(true, te <= te);
Assert.AreEqual(true, dte != te);
Assert.AreEqual(false, te != te);
Assert.AreEqual(true, te2 < te);
Assert.AreEqual(true, te2 <= te);
Assert.AreEqual(true, dte > te);
Assert.AreEqual(true, dte >= te);
Assert.AreEqual(true, te.Equals(te));
Assert.AreEqual(true, dte.Equals(te + te));
Assert.AreEqual(true, !te.Equals(new object()));
Assert.AreEqual(true, !te.Equals(null));
Assert.AreEqual(true, !TimeEntry.Zero.Equals(null));
Assert.AreEqual(0, te.CompareTo(te));
Assert.AreEqual(true, te2.CompareTo(te) < 0);
Assert.AreEqual(true, te3.CompareTo(te) < 0);
Assert.AreEqual(true, dte.CompareTo(te) > 0);
Assert.AreEqual(1, dte.CompareTo(null));
Assert.Throws <ArgumentException>(() => te.CompareTo(new object()));
}