c# - NUnit 和测试 Xamarin PCL

Question

我正在开发一个可移植类库和 iOS 应用程序，其中数据访问基于 Paul Betts' ModernHttpClient , Fusillade , Refit和 Akavache图书馆。这适用于 PCL 和 iOS 应用程序，但我在针对 PCL 创建单元测试时遇到问题。

如果我使用 Resharper在 Visual Studio 2015 中运行的测试我的所有测试都通过了，但是如果我在 Xamarin Studio 中运行 NUnit 测试，大约一半的测试失败并显示 TypeLoadExceptions .我试图确定是哪个 dll 导致了我的问题，但据我所知，一切都应该如此。

正在测试的 PCL 类

   internal class ApiService<TRefitService> : IApiService<TRefitService> where TRefitService : IServiceContract
    {
        private readonly Lazy<TRefitService> background;
        private readonly Lazy<TRefitService> userInitiated;
        private readonly Lazy<TRefitService> speculative;

        private ApiService(){}

        public ApiService(string baseUrl)
        {
            ParameterGuard.ThrowIfNullOrEmpty(baseUrl, nameof(baseUrl));

            Func<string, RateLimitedHttpMessageHandler, TRefitService> createClient = (address, handler) =>
            {
                HttpClient client = new HttpClient(handler) {BaseAddress = new Uri(address)};
                return RestService.For<TRefitService>(client);
            };

            background = new Lazy<TRefitService>(() => createClient(baseUrl, new RateLimitedHttpMessageHandler(new NativeMessageHandler(), Priority.Background)));
            speculative = new Lazy<TRefitService>(() => createClient(baseUrl, new RateLimitedHttpMessageHandler(new NativeMessageHandler(), Priority.Speculative)));
            userInitiated = new Lazy<TRefitService>(() => createClient(baseUrl, new RateLimitedHttpMessageHandler(new NativeMessageHandler(), Priority.UserInitiated)));
        }

        /// <summary>
        /// Use for network requests that are running in the background.
        /// </summary>
        public TRefitService Background => background.Value; 

        /// <summary>
        /// Use to fetch data into a cache when a page loads. Expect that these requests will only get so far then give up and start failing.
        /// </summary>
        public TRefitService Speculative => speculative.Value;

        /// <summary>
        /// Use for network requests that are fetching data that the user is waiting on *right now*.
        /// </summary>
        public TRefitService UserInitiated => userInitiated.Value;
    }

Xamarin Studio 未通过测试

        [Test()]
        public void PassingInANullBaseUrlThrowsAnException()
        {
            Assert.Throws<ArgumentNullException>(() => new ApiService<IAuthorisationApi>(null));
        }

测试结果

Expected: But was: (Could not load type 'ApiService`1' from assembly '/Users/206474978/Desktop/test/test/test/bin/Debug/xxx.xxx.xxx.dll'.) at NUnit.Framework.Assert.Throws (IResolveConstraint expression, NUnit.Framework.TestDelegate code, System.String message, System.Object[] args) <0x377c1c8 + 0x000e6> in :0

at NUnit.Framework.Assert.That (System.Object actual, IResolveConstraint expression, System.String message, System.Object[] args) <0x377c888 + 0x000bf> in :0 at NUnit.Framework.Assert.Throws (IResolveConstraint expression, NUnit.Framework.TestDelegate code, System.String message, System.Object[] args) <0x377c1c8 + 0x00137> in :0
at NUnit.Framework.Assert.Throws (System.Type expectedExceptionType, NUnit.Framework.TestDelegate code, System.String message, System.Object[] args) <0x377bfc8 + 0x0004f> in :0
at NUnit.Framework.Assert.Throws[T] (NUnit.Framework.TestDelegate code, System.String message, System.Object[] args) <0x377bf58 + 0x00033> in :0 at NUnit.Framework.Assert.Throws[T] (NUnit.Framework.TestDelegate code) <0x377bf08 + 0x0003b> in :0 at test.Test+ApiServiceTest.PassingInANullBaseUrlThrowsAnException () [0x00001] in /Users/206474978/Desktop/test/test/test/Test.cs:37 at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&) at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00038] in /private/tmp/source-mono-4.2.3/bockbuild-mono-4.2.0-branch/profiles/mono-mac-xamarin/build-root/mono-4.2.3/mcs/class/corlib/System.Reflection/MonoMethod.cs:295

现在这通常不会成为问题，因为我只会使用整形器，但我正在 Jenkins 之上构建我们的持续集成管道，并通过 Xamarin 库中的 nunit 包运行测试，这导致构建报告失败。

知道这里的问题是什么吗？

更新

好的，按照 SushiHangover 的提示，我使用了最新版本的 NUnit 测试运行器并获得了以下输出。似乎错误是 TypeLoadException 或 BadImageFormatException 但我不确定为什么。我检查了两个项目的输出，都设置为 AnyCPU。

    [Test()]
public void PassingInAValidBaseAddressGivesAValidRefitUserInitiatedObject()
{
    var api = new ApiService<IAuthorisationApi>(BaseAddress);
    Assert.IsNotNull(api.UserInitiated);
}

    [Test()]
    public async Task PassingInAValidBaseAddressReturnsAValidAccountFromTheBackgroundObject()
    {
        //Arrange
        ApiService<IAuthorisationApi> service = = new ApiService<IAuthorisationApi>(BaseAddress);;
        //Act

        AuthorisationDto account = await service.Background.GetAuthorisationToken(logonPost, "ireland");
        //Assert
        Assert.IsTrue(account != null);
    }

Invalid type xxx.xxx.Core.Services.Lib.ApiService`1 for instance field xxx.xxx.Core.Tests.ApiServiceTest+c__async0:__0

7) Error : xxx.xxx.Core.Tests.ApiServiceTest.PassingInAValidBaseAddressGivesAValidRefitUserInitiatedObject
System.TypeLoadException : Failure has occurred while loading a type.
  at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) <0x3083b38 + 0x00093> in <filename unknown>:0 

8) Error : xxx.xxx.Core.Tests.ApiServiceTest.PassingInAValidBaseAddressReturnsAValidAccountFromTheBackgroundObject
System.BadImageFormatException : Could not resolve field token 0x040001ae
  at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) <0x3083b38 + 0x00093> in <filename unknown>:0 

更新 2

另一个测试失败并显示以下堆栈跟踪，这看起来像是单声道的问题？

System.TypeLoadException : Could not load type 'ApiService`1' from assembly '/Users/206474978/Documents/Development/Projects/BRSMemberApp/UnitTests/BrsGolf.Members.Core.Tests/bin/Debug/Brs.Members.Core.dll'.

at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&) at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00038] in /private/tmp/source-mono-4.2.3/bockbuild-mono-4.2.0-branch/profiles/mono-mac-xamarin/build-root/mono-4.2.3/mcs/class/corlib/System.Reflection/MonoMethod.cs:295

Answer 1

(这与我发布的旧 answer 有关)

安装的 Mono 框架包括相对较旧版本的 NUnit(版本 2.4.8)。该版本中存在许多问题/错误，范围从不正确的异常捕获到解决方案/项目解析问题。

我们为 OS-X 构建(包括 Jenkins CI)所做的是通过 nuget 安装最新的 NUnit 到我们的解决方案根目录，并将该安装用于构建工件的本地测试。

类似于:

cd YourSolutionRootDir
nuget install nunit.runners
mono ./NUnit.ConsoleRunner.3.2.0/tools/nunit3-console.exe MyTestProject/bin/debug/except.dll