在xUnit和Visual Studio中,我想在Test Explorer中对使用[Collection(“DB”)]属性标记的测试进行分组.我只能通过[Trait(“Collection”,“DB”)]属性进行分组测试.有没有办法如何使用[Collection(“DB”)]属性为所有测试分配特定的Trait？

更新：我已添加xUnit issue #799.

解决方法:

从http://mac-blog.org.ua/xunit-category-trait/复制.

using System;
using System.Collections.Generic;
using System.Linq;
using Xunit;
using Xunit.Abstractions;
using Xunit.Sdk;
using XunitCategoriesSample.Traits;

namespace XunitCategoriesSample.Traits
{
    public class CategoryDiscoverer : ITraitDiscoverer
    {
        public const string KEY = "Category";

        public IEnumerable<KeyValuePair<string, string>> GetTraits(IAttributeInfo traitAttribute)
        {
            var ctorArgs = traitAttribute.GetConstructorArguments().ToList();
            yield return new KeyValuePair<string, string>(KEY, ctorArgs[0].ToString());
        }
    }

    //NOTICE: Take a note that you must provide appropriate namespace here
    [TraitDiscoverer("XunitCategoriesSample.Traits.CategoryDiscoverer", "XunitCategoriesSample")]
    [AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
    public class CategoryAttribute : Attribute, ITraitAttribute
    {
        public CategoryAttribute(string category) { }
    }
}

namespace XunitCategoriesSample
{
    public class Class1
    {
        [Fact]
        [Category("Jobsearcher")]
        public void PassingTest()
        {
            Assert.Equal(4, Add(2, 2));
        }

        [Fact]
        [Category("Employer")]
        public void FailingTest()
        {
            Assert.Equal(5, Add(2, 2));
        }

        int Add(int x, int y)
        {
            return x + y;
        }
    }
}

注意您必须在TraitDiscoverer属性中提供正确的命名空间.

但是更多,让我们制作更专业的属性：

public class JobsearcherTraitDiscoverer : ITraitDiscoverer
{
    public const string VALUE = "Jobsearcher";

    public IEnumerable<KeyValuePair<string, string>> GetTraits(IAttributeInfo traitAttribute)
    {
        yield return new KeyValuePair<string, string>(CategoryDiscoverer.KEY, VALUE);
    }
}

[TraitDiscoverer("XunitCategoriesSample.Traits.JobsearcherTraitDiscoverer", "XunitCategoriesSample")]
[AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
public class JobsearcherTraitAttribute : Attribute, ITraitAttribute
{
    public JobsearcherTraitAttribute()
    {
    }
}

所以从现在开始你可以输入[JobsearcherTrait]

链接：

https://github.com/xunit/xunit/issues/394 – 讨论为什么TraitAttribute被标记为密封

https://github.com/xunit/samples.xunit/tree/master/TraitExtensibility – xunit示例如何制作自定义属性

https://github.com/wespday/CategoryTraits.Xunit2 – 还有一个样本

https://github.com/xunit/xunit/blob/47fdc2669ae6aa28f6d642e202840193dfc7dbd7/test/test.xunit.execution/Common/TraitHelperTests.cs – xunit测试实现自定义属性的示例