public void EdateShouldReturnCorrectResult()
{
var func = new Edate();
var dt1arg = new DateTime(2012, 1, 31).ToOADate();
var dt2arg = new DateTime(2013, 1, 1).ToOADate();
var dt3arg = new DateTime(2013, 2, 28).ToOADate();
var r1 = func.Execute(FunctionsHelper.CreateArgs(dt1arg, 1), _parsingContext);
var r2 = func.Execute(FunctionsHelper.CreateArgs(dt2arg, -1), _parsingContext);
var r3 = func.Execute(FunctionsHelper.CreateArgs(dt3arg, 2), _parsingContext);
var dt1 = DateTime.FromOADate((double) r1.Result);
var dt2 = DateTime.FromOADate((double)r2.Result);
var dt3 = DateTime.FromOADate((double)r3.Result);
var exp1 = new DateTime(2012, 2, 29);
var exp2 = new DateTime(2012, 12, 1);
var exp3 = new DateTime(2013, 4, 28);
Assert.AreEqual(exp1, dt1, "dt1 was not " + exp1.ToString("yyyy-MM-dd") + ", but " + dt1.ToString("yyyy-MM-dd"));
Assert.AreEqual(exp2, dt2, "dt1 was not " + exp2.ToString("yyyy-MM-dd") + ", but " + dt2.ToString("yyyy-MM-dd"));
Assert.AreEqual(exp3, dt3, "dt1 was not " + exp3.ToString("yyyy-MM-dd") + ", but " + dt3.ToString("yyyy-MM-dd"));
}
