ASP.NET Tutorial : The Benefits of Test-Driven Development (TDD) in.NET Core

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Test-Driven Development (TDD) is an effective way to writing robust, maintainable code in the realm of software development. This practice, particularly in.NET Core, encourages the creation of tests prior to the creation of actual code. Following this method ensures that developers' code matches the desired requirements and is resistant to modifications over time. In this blog, we'll go over the fundamentals of TDD utilizing XUnit and Moq in a.NET Core context, as well as demonstrate its implementation with an example.

What exactly is TDD in.NET Core?

  1. TDD follows a straightforward but effective cycle: Red, Green, Refactor.
  2. Write a failed test that explains the needed functionality in red.
  3. Green: Write the bare minimum of code needed to pass the test.
  4. Refactoring is the process of improving code without affecting its behavior, ensuring that it is clean and maintainable.

Example Scenario

Let's simulate a basic scenario: creating a simple calculator class that performs addition. Our goal is to ensure the calculator correctly adds two numbers. We'll be using XUnit for unit testing and Moq for mocking dependencies.

Step 1. Installation

To set up the project with XUnit and Moq, install the necessary packages.

Step 2. Writing the Test

Create a new test class to cover the functionality of the calculator.

using Microsoft.Extensions.Logging;
using Moq;

namespace TDDApproach.Test
    public class CaclulatorTests
        public void Add_TwoNumbers_ReturnsSum()
            // Arrange
            var logger = new Mock<ILogger<Calculator>>();
            var calculator = new Calculator(logger.Object);

            // Act
            var result = calculator.Add(3, 5);

            // Assert
            Assert.Equal(8, result);
Step 3. Implementing the Calculator

Now, let's create the Calculator class that will satisfy the test.

using Microsoft.Extensions.Logging;

namespace TDDApproach
    public class Calculator
        private readonly ILogger _logger;
        public Calculator(ILogger loggger)
            _logger = loggger;


        public int Add(int a, int b)
            _logger.LogInformation($"Adding {a} and {b}");
            return a + b;


Step 4. Running the Test

Execute the test to see it fail, then implement the Calculator class to make the test pass. Once passing, refactor the code to enhance its quality without altering the behavior.

Test-Driven Development in.NET Core with XUnit and Moq enables developers to write reliable, maintainable code by developing tests before the real code. This iterative method assures that the program performs as planned while still remaining responsive to changes.

Developers can improve the overall quality of their.NET Core applications by following the Red-Green-Refactor cycle.

TDD is a methodology that encourages a deeper grasp of requirements and aids in the production of more robust, error-resistant code.

Remember that this is only a basic instance. TDD may be applied to increasingly complicated projects, greatly improving software stability and maintainability.

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