Flurl & HttpTest：单元测试在运行 All 时失败，但在运行单独时通过

Question

更新： HttpTest 不是线程安全的，根据项目的 GitHub issue。在问题解决之前，使用 HttpTest 的测试不能并行运行。

我有一对使用 Flurl 和 xUnit 的非常奇怪的测试，当运行 All in VS Test Explorer 时，将失败，但如果单独运行，将通过。我这辈子都看不到这两者之间有什么关联，但它们确实有关联。

我已将它们从我的项目中提取到一个新项目中，但问题仍然存在。我将它们捆绑成 7z 供有兴趣将其加载到 VS 的任何人使用，但完整代码如下。

Project.Commons

GetApi1:

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Flurl;
using Flurl.Http;

namespace Project.Commons
{
    public class GetApi1
    {

        public async Task<string> ExecuteAsync(string token)
        {
            string apikeyKeyname = "token";

            dynamic response = await "http://www.api.com"
                .SetQueryParams(new { token = token })
                .GetJsonAsync();

            string receivedApiKey = ((IDictionary<string, object>)response)[apikeyKeyname].ToString();

            return receivedApiKey;
        }
    }
}

GetApi2:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Flurl;
using Flurl.Http;

namespace Project.Commons
{
    public class GetApi2
    {
        public async Task<IList<string>> ExecuteAsync()
        {
            var responses = await "http://www.api.com"
                .GetJsonAsync<List<string>>();

            var result = new List<string>();

            foreach (var response in responses)
            {
                result.Add("refined stuff");
            }

            return result;
        }
    }
}

Project.Tests

单元测试 1:

using Project.Commons;

namespace Project.Tests
{
    public class UnitTest1
    {
        private ITestOutputHelper output;
        public UnitTest1(ITestOutputHelper output)
        {
            this.output = output;
        }

        [Fact]
        public async Task ShouldBeAbleToGetApiKeyFromToken()
        {
            // Arrange
            using (var httpTest = new HttpTest())
            {
                var jsonResponse = new { token = "abcdef" };
                string expectedApiKey = "abcdef";
                httpTest.RespondWithJson(jsonResponse);
                var api = new GetApi1();

                // Act
                var receivedApiKey = await api.ExecuteAsync("mockToken");
                output.WriteLine("Received apikey = " + receivedApiKey);

                // Assert
                Assert.Equal(expectedApiKey, receivedApiKey);
            }
        }
    }
}

单元测试2

using Flurl.Http.Testing;
using Project.Commons;
using Xunit;
using Xunit.Abstractions;

namespace Project.Tests
{
    public class UnitTest2
    {


        #region Mock API JSON Response
        private IList<string> mockResponse = new List<string>()
        {
            "raw stuff", "raw stuff", "raw stuff"
        };
        #endregion

        #region Expected Result
        private IList<string> expectedResult = new List<string>()
        {
            "refined stuff", "refined stuff", "refined stuff"
        };
        #endregion

        [Fact]
        public async Task CanGetProjectsByWeek()
        {
            // Arrange
            using (var httpTest = new HttpTest())
            {
                httpTest.RespondWithJson(mockResponse);

                // Act
                var api = new GetApi2();
                var actualResult = await api.ExecuteAsync();

                // Assert
                Assert.Equal(expectedResult,actualResult);
            }
        }
    }
}

Answer 1

评论是正确的 - 缺乏线程安全是 HttpTest 的一个已知限制。它是 logged 并且正在调查中。与几年前创建并行测试相比，今天的并行测试更为普遍，因此虽然修复不是微不足道的，但我们会优先处理它。

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