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