public void MaybeNothing()
{
var exprFactory = new MaybeExpressionFactory(MaybeMonad.Instance);
var parser = new ExpressionParser <Maybe <object> >(exprFactory);
var expr = parser.Parse("A + 0.5 + 0.5").Expression;
var result = expr.Evaluate(new { });
Assert.That(result.HasValue, Is.False);
}
public void DivideByZero()
{
var exprFactory = new MaybeExpressionFactory(MaybeMonad.Instance);
var parser = new ExpressionParser <Maybe <object> >(exprFactory);
var expr = parser.Parse("1/0").Expression;
var result = expr.Evaluate(new { });
Assert.That(result, Is.EqualTo(Maybe <object> .None));
}
public void MaybeSome()
{
var exprFactory = new MaybeExpressionFactory(MaybeMonad.Instance);
var parser = new ExpressionParser <Maybe <object> >(exprFactory);
var expr = parser.Parse("A + 0.5 + 0.5").Expression;
var result = expr.Evaluate(new { A = 0.5d });
Assert.That(result.HasValue);
Assert.That((double)result.Value, Is.EqualTo(1.5).Within(0.00000001));
}