public void SimpleCalcEngine_Calculate_Add3Decimals_ReturnsCorrectResult()
{
var calc = new SimpleCalcEngine();
IEnumerable <INode> nodes = new INode[]
{
new Number(10.5m),
new Operator(OperatorType.Add),
new Number(20.25m),
new Operator(OperatorType.Add),
new Number(30.1m)
};
object result = calc.Evaluate(nodes);
Assert.IsType <decimal>(result);
Assert.Equal(60.85m, (decimal)result);
}
public void SimpleCalcEngine_Calculate_MixedOperators_ReturnsCorrectResult()
{
var calc = new SimpleCalcEngine();
IEnumerable <INode> nodes = new INode[]
{
new Number(10.1m),
new Operator(OperatorType.Subtract),
new Number(3),
new Operator(OperatorType.Multiply),
new Number(2.5m)
};
object result = calc.Evaluate(nodes);
Assert.IsType <decimal>(result);
Assert.Equal(((10.1m - 3) * 2.5m), (decimal)result);
}
public void SimpleCalcEngine_Calculate_Add3Ints_ReturnsCorrectResult()
{
var calc = new SimpleCalcEngine();
IEnumerable <INode> nodes = new INode[]
{
new Number(4),
new Operator(OperatorType.Add),
new Number(9),
new Operator(OperatorType.Add),
new Number(16)
};
object result = calc.Evaluate(nodes);
Assert.IsType <int>(result);
Assert.Equal(29, (int)result);
}
public void SimpleCalcEngine_Calculate_WithNullNodes_ThrowsException()
{
var calc = new SimpleCalcEngine();
Assert.Throws <ArgumentNullException>(() => calc.Evaluate(null));
}