public void VisitAssignmentReturnsCorrectResult(int y, CalculationVisitor sut)
{
var left = new Variable("x");
var right = new Constant(y);
var assignment = new Assignment(left, right);
sut.Visit(assignment);
var expected = y;
Assert.Equal(expected, sut.Result);
}
public void VisitDivisionExpressionReturnsCorrectResult(int x, int y, CalculationVisitor sut)
{
var left = new Constant(x);
var right = new Constant(y);
var division = new DivisionExpression(left, right);
sut.Visit(division);
var expected = x / y;
Assert.Equal(expected, sut.Result);
}
static void Calculate()
{
//a=5*b+2
var expression = new Assignment(new Variable("a"),
new AdditionExpression(new MultiplicationExpression(new Constant(5),
new Variable("b", 2)),
new Constant(2)));
var equationPrintingVisitor = new EquationPrintingVisitor();
equationPrintingVisitor.Visit(expression);
var calculationVisitor = new CalculationVisitor();
calculationVisitor.Visit(expression);
Console.WriteLine($"Expression: {equationPrintingVisitor.Equation}");
Console.WriteLine($"The result is: {calculationVisitor.Result}");
}
public void VisitConstantReturnsCorrectResult(Constant constant, CalculationVisitor sut)
{
sut.Visit(constant);
Assert.Equal(constant.Value, sut.Result);
}
public void VisitVariableReturnsCorrectResult(Variable variable, CalculationVisitor sut)
{
sut.Visit(variable);
Assert.Equal(variable.Value, sut.Result);
}
public void SutIsVisitor(CalculationVisitor sut)
{
Assert.IsAssignableFrom <Visitor>(sut);
}
