public void TestOptionalParams()
{
Fixed fixedFunc = new Fixed();
ValueEval Evaluate = fixedFunc.Evaluate(0, 0, new NumberEval(1234.56789));
Assert.IsTrue(Evaluate is StringEval);
Assert.AreEqual("1,234.57", ((StringEval)Evaluate).StringValue);
Evaluate = fixedFunc.Evaluate(0, 0, new NumberEval(1234.56789), new NumberEval(1));
Assert.IsTrue(Evaluate is StringEval);
Assert.AreEqual("1,234.6", ((StringEval)Evaluate).StringValue);
Evaluate = fixedFunc.Evaluate(0, 0, new NumberEval(1234.56789), new NumberEval(1), BoolEval.TRUE);
Assert.IsTrue(Evaluate is StringEval);
Assert.AreEqual("1234.6", ((StringEval)Evaluate).StringValue);
Evaluate = fixedFunc.Evaluate(new ValueEval[] { }, 1, 1);
Assert.IsTrue(Evaluate is ErrorEval);
Evaluate = fixedFunc.Evaluate(new ValueEval[] { new NumberEval(1), new NumberEval(1), new NumberEval(1), new NumberEval(1) }, 1, 1);
Assert.IsTrue(Evaluate is ErrorEval);
}