public override IValue Evaluate(Environment env)
{
IValue value = ValueExpression.Evaluate(env);
env.AddBinding(Variable, value);
return(Void.VoidLiteral);
}
public void TestExpressZeroValue()
{
// GIVEN: a value expression with the value 0
var valueExpression = new ValueExpression {
Value = 0
};
// WHEN: it is evaluated
var evaluation = valueExpression.Evaluate();
// THEN: the result has a value of 0
Assert.AreEqual(0, evaluation.Value);
}
public void TestExpressPositiveValue()
{
// GIVEN: a value expression with the value 5
var valueExpression = new ValueExpression {
Value = 5
};
// WHEN: it is evaluated
var evaluation = valueExpression.Evaluate();
// THEN: the result has a value of 5
Assert.AreEqual(5, evaluation.Value);
}
public void TestExpressNegativeValue()
{
// GIVEN: a value expression with the value -2
var valueExpression = new ValueExpression {
Value = -2
};
// WHEN: it is evaluated
var evaluation = valueExpression.Evaluate();
// THEN: the result has a value of -2
Assert.AreEqual(-2, evaluation.Value);
}