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C# Unit Testing in C# Test Driven Development TDD

Jonas Gamburg
Jonas Gamburg
11,193 Points
Posted by Jonas Gamburg
Jonas Gamburg
11,193 Points

Bummer! Assert.Equal() Failure, Expected: 0.9, Actual: 0.9 What am I doing wrong??

It says to implement the Subtractr method so that the test passes. It seems to pass just fine, but it it doesn't let me continue.

' ' 'c# Bummer! Assert.Equal() Failure, Expected: 0.9, Actual: 0.9

' ' ' c#

Calculator.cs 
public class Calculator
{
    public double Result;

    public Calculator(double number)
    {
        Result = number;
    }     

    public void Add(double number)
    {
        Result += number;
    }

    public void Substract(double number)
    {
        Result -= number;
    }
}
CalculatorTests.cs 
using Xunit;

public class CalculatorTests
{


    [Fact]
    public void Initialization()
    {
        var expected = 1.1;
        var target = new Calculator(1.1);
        Assert.Equal(expected, target.Result, 1);
    }

    [Fact]
    public void BasicAdd()
    {
        var target = new Calculator(1.1);
        target.Add(2.2);
        var expected = 3.3;
        Assert.Equal(expected, target.Result, 1);
    }

    [Fact]
    public void BasicSubtract()
    {
        var target = new Calculator(1.1);
        target.Substract(0.2);
        var expected = 0.9;
        Assert.Equal(expected, target.Result);
    }
}

1 Answer

Jennifer Nordell
seal-mask
STAFF
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher
Jennifer Nordell
.a{fill-rule:evenodd;}techdegree
Jennifer Nordell
Treehouse Teacher

Hi there! You're really close, but you have 2 typos and a missing argument. Twice you've misspelled "Subtract" as "Substract". Note the extraneous "s" in your version. Those are found in these lines:

// This one
 public void Substract(double number)

// And this one
target.Substract(0.2);

Also, you need to pass in the integer 1 at the end of your assertion here:

 Assert.Equal(expected, target.Result, 1);

Hope this helps! :sparkles:

edited to change the word "parameter" to "argument" to be semantically correct

Jonas Gamburg
Jonas Gamburg
11,193 Points
Jonas Gamburg
Jonas Gamburg
11,193 Points

Thank you very much, it made all the difference! :D