Constructor on type not found error in privateobject

Question

1.00/5 (1 vote)

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I'm writing a unit test for calculation software.in test case i used of "PrivateObject" for accessing to private method "sendNumberToCalculation()" , but i get error constructor on type not found.

C#

 public class CalculationTest
{
    [TestMethod]
    public void sendNumberToCalculationTest()
    {

        // -- Act
        PrivateObject obj = new PrivateObject(typeof(Calculation));
        Tokenization token = new Tokenization("5*10-18/(3+19)");
        PolishNotation polish = new PolishNotation(token.MathExpressionParser());

        double expected = 49.19;

        // -- Actual
        double actual = Convert.ToDouble(obj.Invoke("sendNumberToCalculation", polish));

        // -- Assert
        Assert.AreEqual(expected, actual);
    }
}

    public class Calculation
{

    private Tokenization token;

    private PolishNotation polish;
    private Stack<double> numbers = new Stack<double>();
    private Stack<string> operators = new Stack<string>();

    public Calculation(string expression)
    {
        token = new Tokenization(expression);
        polish = new PolishNotation(token.MathExpressionParser());
    }

    private double sendNumberToCalculation()
    {
        int number;
        int number1 = 0;
        int number2 = 0;
        string operatorName = "";
        int counter = 1;
        foreach (var item in polish.InfixToPostfix())
        {
            numbers.Push(Convert.ToDouble(item));
            if (!int.TryParse(item, out number))
            {
                operators.Push(item);
                while (counter <= 2 && numbers.Count > 1)
                {
                    if (counter == 1)
                    {
                        number2 = Convert.ToInt32(numbers.Pop());
                    }
                    else if (counter == 2 && operators.Count > 0)
                    {
                        number1 = Convert.ToInt32(numbers.Pop());
                        operatorName = operators.Pop();
                    }
                }
            }
            operatorDetect(number1, number2, operatorName);
        }
        var result = numbers.Pop();

        return result;
    }

    private void operatorDetect(int number1, int number2, string operatorName)
    {
        switch (operatorName)
        {
            case "+":
                Add(number1, number2);
                break;

            case "*":
                Multipy(number1, number2);
                break;

            case "/":
                Divide(number1, number2);
                break;

            case "-":
                Subtract(number1, number2);
                break;
        }
    }

    private void Add(int number1, int number2)
    {
        double number = number1 + number2;
        numbers.Push(number);
    }

    private void Multipy(int number1, int number2)
    {
        double number = number1 * number2;
        numbers.Push(number);
    }

    private void Subtract(int number1, int number2)
    {
        double number = number1 / number2;
        numbers.Push(number);
    }

    private void Divide(int number1, int number2)
    {
        double number = number1 - number2;
        numbers.Push(number);
    }
}

What I have tried:

i get error constructor on type not found and i wanna fix it bug.

Posted 2-Aug-16 8:48am

log98

Updated 2-Aug-16 9:05am

Add a Solution

2 solutions

Solution 1

Can we have a screenshot of the error and the line please ?

Posted 2-Aug-16 8:51am

Kadau _

Comments

Richard Deeming 2-Aug-16 14:58pm

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Richard Deeming · Accepted Answer · 2016-08-02T09:05:00

Your Calculation class does not contain a parameterless constructor. You need to pass the constructor parameters to the PrivateObject constructor[^]:

C#

string expression = "5*10-18/(3+19)";

PrivateObject obj = new PrivateObject(
    typeof(Calculation),      // The type of the object to create
    new[] { typeof(string) }, // The type of each parameter
    new[] { expression });    // The value for each parameter

You're also trying to invoke the sendNumberToCalculation method with one parameter of the PolishNotation type, but that method doesn't have any parameters. You need to remove the second argument from the Invoke call:

C#

double actual = Convert.ToDouble(obj.Invoke("sendNumberToCalculation"));