steps to do xunit testing in c#

Question

Krishna Yadav · Answer

Create a test project, reference the production project, arrange inputs and dependencies, execute one behavior, and assert the observable result. Keep unit tests deterministic and fast; use integration tests when the behavior depends on a real database, filesystem, queue, or HTTP boundary.

```bash
dotnet new xunit -n Shop.UnitTests
dotnet add Shop.UnitTests reference Shop.Application
dotnet test
```

```csharp
public sealed class PriceCalculatorTests
{
    [Theory]
    [InlineData(100, 0.10, 90)]
    [InlineData(50, 0, 50)]
    public void ApplyDiscount_ReturnsExpectedTotal(
        decimal subtotal, decimal rate, decimal expected)
    {
        var sut = new PriceCalculator();

decimal actual = sut.ApplyDiscount(subtotal, rate);

Assert.Equal(expected, actual);
    }

[Fact]
    public void ApplyDiscount_RejectsNegativeSubtotal()
    {
        var sut = new PriceCalculator();
        Assert.Throws<ArgumentOutOfRangeException>(
            () => sut.ApplyDiscount(-1, 0.1m));
    }
}
```

Name tests around behavior, cover boundaries and failure paths, and avoid asserting private implementation details. CI should run `dotnet test` from a clean checkout.

steps to do xunit testing in c#

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