public void CalcTest()
{
// Test unary operators
var te = new TimeEntry(10, 40);
var mte = new TimeEntry(-10, -40);
Assert.AreEqual(te, +te);
Assert.AreEqual(TimeEntry.Zero, te - (+te));
Assert.AreEqual(TimeEntry.Zero, te + (-te));
Assert.AreEqual(TimeEntry.Zero - te, -te);
Assert.AreEqual(mte, -te);
Assert.AreEqual(te, -mte);
// Test binary ops
var dte = new TimeEntry(21, 20);
Assert.AreEqual(dte, te + te);
Assert.AreEqual(TimeEntry.Zero, te - te);
var te2 = new TimeEntry(3, 33);
Assert.AreEqual(te + te2, te2 + te);
Assert.AreEqual(te - te2, -(te2 - te));
Assert.AreEqual(te, dte - te);
Assert.AreEqual(te, te + te - te);
Assert.AreEqual(te, te + (te - te));
Assert.AreEqual(te, (te + te) - te);
Assert.AreEqual(te, te + TimeEntry.Zero);
Assert.AreEqual(te, te - TimeEntry.Zero);
// Test if methods do the same
Assert.AreEqual(te.Add(te2), te + te2);
Assert.AreEqual(te.Substract(te2), te - te2);
// Test calcualtions with decimals and seconds
// Test precise calculations
Assert.AreEqual(new TimeEntry(0, 0, 50, 0), new TimeEntry(0, 0, 37, 0) + new TimeEntry(0, 0, 13, 0));
Assert.AreEqual(new TimeEntry(0, 0, 0, 50), new TimeEntry(0, 0, 0, 37) + new TimeEntry(0, 0, 0, 13));
// Loss of precision
Assert.AreEqual(new TimeEntry(0, 0, 0, 74), new TimeEntry(0, 0, 37, 0) + new TimeEntry(0, 0, 0, 13));
}