public void Evaluate_NumberOperand_ReturnsNumber()
{
var operand = new Number(1.5);
var expression = new Minus(operand);
var result = expression.EvaluateWithData();
Assert.AreEqual(-1.5, result);
}
public void Evaluate_IntegerOperand_ReturnsInteger()
{
var operand = new Integer(3);
var expression = new Minus(operand);
var result = expression.EvaluateWithData();
Assert.AreEqual(-3, result);
}
public void Evaluate_NullOperand_ThrowsInvalidOperationException()
{
var operand = Null.Instance;
var expression = new Minus(operand);
Assert.Throws <InvalidOperationException>(() =>
{
expression.EvaluateWithData();
});
}
public void Evaluate_BooleanOperand_ThrowsInvalidOperationException()
{
var operand = new Text("Not a Number");
var expression = new Minus(operand);
Assert.Throws <InvalidOperationException>(() =>
{
expression.EvaluateWithData();
});
}