xUnit测试指南：.NET微服务实战教程

• 使用命令 dotnet new xunit -n MyMicroservice.Tests 创建测试项目
• 将测试项目引用主微服务项目：dotnet add reference ../MyMicroservice/MyMicroservice.csproj
• 确保已安装必要的包，如 Microsoft.NET.Test.Sdk 和 xunit.runner.visualstudio

public class OrderServiceTests
{
    [Fact]
    public void CalculateTotal_ShouldReturnCorrectAmount()
    {
        var service = new OrderService();
        var items = new List
        {
            new OrderItem { Price = 10, Quantity = 2 },
            new OrderItem { Price = 5, Quantity = 4 }
        };

        var total = service.CalculateTotal(items);

        Assert.Equal(40, total);
    }
}

public class ProductApiTests : IClassFixture>
{
    private readonly HttpClient _client;

    public ProductApiTests(WebApplicationFactory factory)
    {
        _client = factory.CreateClient();
    }

    [Fact]
    public async Task GetProducts_ReturnsSuccessStatusCode()
    {
        var response = await _client.GetAsync("/api/products");

        response.EnsureSuccessStatusCode();
        Assert.Equal("application/json", response.Content.Headers.ContentType?.MediaType);
    }
}

[Theory]
[InlineData(-5)]
[InlineData(0)]
[InlineData(10)]
public void ValidateQuantity_ReturnsFalseForInvalidInput(int quantity)
{
    var result = OrderValidator.IsValidQuantity(quantity);

    Assert.False(result);
}