c# - Xunit 多个 IClassFixtures

Question

我的问题是如何在一个测试类中设置多个夹具？

但是 Zoo 类的构造函数不能处理多个 fixture。

例如:

public class Zoo : IClassFixture<Tiger>, IClassFixture<Wolf>, IClassFixure<Bird>
{
   private IFixture fixture;
   public Zoo(IFixture fixture) 
   { 
    this.fixture = fixture; 
   }

   [Fact]
   public void TestAnimal()
   {
    //Arrange 
    int actualBonesCount = this.fixture.BonesCount;
    int expectedBonesCount = 2;

    //Act & Assert
    Assert.Equal(expectedBonesCount, actualBonesCount );
   }
} 

虎类

public class Tiger : FixtureBase
{
   public Tiger()
   {
    this.BonesCount  = 4;
   }
}

鸟类类

public class Bird: FixtureBase
{
   public Bird()
   {
    this.BonesCount  = 2;
   }
}

测试夹具基类

public class FixtureBase : IFixture
{
   public int BonesCount { get; set; }
}

和界面

public interface IFixture
{
   int BonesCount { get; set; }
}

Answer 1

首先，让我们记忆一下我们什么时候想在 xUnit 中使用 Class Fixtures:

When to use: when you want to create a single test context and share it among all the tests in the class, and have it cleaned up after all the tests in the class have finished.

如您所说，您希望将 Zoo 测试类中的方法重用于实现测试。既然实现使用继承，为什么不对测试类也使用继承呢？

public abstract class Zoo
{
    protected readonly IFixture Fixture;

    protected Zoo(IFixture fixture)
    {
       Fixture = fixture;
    }

    [Fact]
    public void TestAnimal()
    {
        //Arrange 
        int actualBonesCount = Fixture.BonesCount;
        int expectedBonesCount = 2;

        //Act & Assert
        Assert.Equal(expectedBonesCount, actualBonesCount);
    }
}

public class BirdTests : Zoo, IClassFixture<Bird>
{
    public BirdTests(Bird fixture)
       : base(fixture)
    {
    }
}

public class TigerTests : Zoo, IClassFixture<Tiger>
{
    public BirdTests(Tiger fixture)
       : base(fixture)
    {
    }
}

不过，我真的不明白您希望每个测试如何通过，因为您在通用测试中将 BonesCount 硬编码为 2。