Unit Testing in .NET Core with xUnit

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Unit Testing in .NET Core with xUnit

Unit testing is an essential practice in modern software development, ensuring each piece of code works as expected before integration. In .NET Core, xUnit is a popular, open-source testing framework known for its flexibility, clean syntax, and community support.

To get started, create a new test project using the command:

dotnet new xunit -n MyProject.Tests

Then, reference your main project in the test project using:

dotnet add reference ../MyProject/MyProject.csproj

xUnit identifies test methods with the [Fact] attribute for single-case tests and [Theory] with [InlineData] for parameterized tests. Assertions like Assert.Equal(), Assert.True(), and Assert.Throws() help validate outcomes.

Example:

public class CalculatorTests  

{

    [Fact]  

    public void Add_ReturnsSum()  

    {  

        var calc = new Calculator();  

        var result = calc.Add(2, 3);  

        Assert.Equal(5, result);  

    }  

}

Run tests via:

dotnet test

With its integration into .NET CLI, easy syntax, and powerful features, xUnit makes writing maintainable and reliable tests straightforward, improving code quality and catching bugs early in development. 

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