使用 Xamarin.UITest 测试我的 Xamarin.Forms iOS 应用程序：第一个测试总是失败

Question

我正在使用 Xamarin.UITest 在真实设备上测试 Xamarin.iOS 应用程序（iPhone 6s，iOS 12.1）。当我运行我的几个UI测试时，第一个测试总是接缝崩溃（不管测试内部发生了什么）由于相同的错误（见下文）。

环境是：

Xamarin.UITest 2.2.7
NUnitTestAdapter 2.1.1
NUnit 2.6.3
Xamarin.TestCloud.Agent 0.21.7

设置为：

[SetUp]
public void Setup(){
     this.app = ConfigureApp.iOS
        .EnableLocalScreenshots()
                .InstalledApp("my.app.bundle")
                .DeviceIdentifier("My-iPhone6s-UDID-With-iOS12.1")  
                .StartApp();
}

[Test]
public void FirstTestThatCouldBeEmpty(){
     //But doesn't have to be empty to produce the error    
}

产生的错误：

2019-01-17T14:11:20.4902700Z 1 - ClearData:> 2019-01-17T14:11:20.4916340Z bundleId: my.app.bundle 2019-01-17T14:11:20.4929580Z deviceId: My-iPhone6s-UDID-With-iOS12.1

2019-01-17T14:11:33.7561260Z 3 - LaunchTestAsync:

2019-01-17T14:11:33.7574050Z deviceId: My-iPhone6s-UDID-With-iOS12.1

2019-01-17T14:11:33.9279420Z 5 - HTTP request failed, retry limit hit

2019-01-17T14:11:33.9302300Z Exception: System.Net.Http.HttpRequestException: An error occurred while sending the request ---> System.Net.WebException: Unable to read data from the transport connection: Connection reset by peer. ---> System.IO.IOException: Unable to read data from the transport connection: Connection reset by peer. ---> System.Net.Sockets.SocketException: Connection reset by peer

2019-01-17T14:11:33.9322710Z at System.Net.Sockets.Socket.EndReceive (System.IAsyncResult asyncResult) [0x00012] in <23340a11bb41423aa895298bf881ed68>:0

2019-01-17T14:11:33.9340560Z at System.Net.Sockets.NetworkStream.EndRead (System.IAsyncResult asyncResult) [0x00057] in <23340a11bb41423aa895298bf881ed68>:0

2019-01-17T14:11:33.9358740Z --- End of inner exception stack trace ---

2019-01-17T14:11:33.9377100Z at System.Net.Sockets.NetworkStream.EndRead (System.IAsyncResult asyncResult) [0x0009b] in <23340a11bb41423aa895298bf881ed68>:0

2019-01-17T14:11:33.9398100Z at System.IO.Stream+<>c.b__43_1 (System.IO.Stream stream, System.IAsyncResult asyncResult) [0x00000] in <98fac219bd4e453693d76fda7bd96ab0>:0

2019-01-17T14:11:33.9415720Z at System.Threading.Tasks.TaskFactory1+FromAsyncTrimPromise1[TResult,TInstance].Complete (TInstance thisRef, System.Func`3[T1,T2,TResult] endMethod, System.IAsyncResult asyncResult, System.Boolean requiresSynchronization) [0x00000] in <98fac219bd4e453693d76fda7bd96ab0>:0

有时是这样的错误：

SetUp : Xamarin.UITest.XDB.Exceptions.DeviceAgentException : Unable to end session: An error occurred while sending the request

System.Net.Http.HttpRequestException : An error occurred while sending the request

System.Net.WebException : Unable to read data from the transport connection: Connection reset by peer.

System.IO.IOException : Unable to read data from the transport connection: Connection reset by peer.

System.Net.Sockets.SocketException : Connection reset by peer

有什么解决办法？做 nuget 包的版本难题让我走到了这一步，除了这个之外，所有测试都在工作。

虚拟测试是可能的，但是使用这些测试的大量构建将永远不会处于“成功”状态，因为这个测试失败了 =(

Answer 1

我找到了解决此问题的方法，并且确实解决了设备代理未连接到被测应用的任何问题。

        public static IApp StartApp(Platform platform)
        {
            if (platform == Platform.iOS)
            {
                try
                {
                    return ConfigureApp.iOS
                       .InstalledApp("com.example")
#if DEBUG
                       .Debug()
#endif
                       .StartApp();
                }
                catch
                {
                    return ConfigureApp.iOS
                       .InstalledApp("com.example")
#if DEBUG
                        .Debug()
#endif
                       .ConnectToApp();
                }
            }

通俗地说："If you tried to start the app, and something went wrong, try to see if the app under test was started anyway and connect to it"

注意：正如 https://whosebug.com/users/1214857/iupchris10 在评论中提到的，这种方法的一个警告是当您运行连续测试时，而 StartApp 调用将 理论上 可靠地关闭应用程序，失败点是重新连接，如果它没有并且你连续运行ning 测试，你将简单地连接到运行ning 应用程序实例，无论它处于什么状态被留在了。这种方法没有追索权。 Xamarin 的 StartApp 将抛出异常，而不是类型化异常，因此缓解这种情况将依赖于您解析 InnerException.Message 并保持 table 预期失败。

使用 Xamarin.UITest 测试我的 Xamarin.Forms iOS 应用程序：第一个测试总是失败

Testing my Xamarin.Forms iOS Application with Xamarin.UITest: The first test always fails

automated-tests

ui-testing

xamarin.ios

xamarin

xamarin.uitest