Run Mono iOS sample on Helix

[MaximLipnin]

• Included the ios sample project to the library test build. The sample still can be build/run locally using make file.
• Added copying resulting HelloiOS.app to helix directory from where it can be consumed by CI.
• Changed the sample to return 42 when building for CI, which is used as an expected exit code for xharness.
• Xharness for iOS supports running an application on a simulator w/o test runner inside, the sample is run by this approach.
• Checked locally that xharness can run HelloiOS.app successfully.

Related issue: #43865

[Dotnet-GitSync-Bot]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[steveisok]

Might have to rebase to get CI to play nice.

[MaximLipnin]

At the moment it requires arcade helix sdk bump to, at least, version=6.0.0-beta.20577.1".

[MaximLipnin]

According to the CI log, the sample runs as expected:

[03:47:11] dbug: 03:47:11.4844910 Xamarin.Hosting: Launched net.dot.HelloiOS with pid 84147
[03:47:28] dbug: 03:47:28.5087870 Xamarin.Hosting: Simulated process has exited.
[03:47:28] dbug: 03:47:28.5138190 Process mlaunch exited with 0
[03:47:28] dbug: 03:47:28.5184190 App run ended with 42
[03:47:28] info: Application has finished with exit code: 42 (as expected)
XHarness exit code: 0

[steveisok]

@akoeplinger Please give this a review.

[SamMonoRT]

We should figure out why xharness return code is 42 and not 0 or 1 or 100. That seems strange to me. @fanyang-mono didn't you encounter something similar while bringing up the Android simulator runtime tests ?

[steveisok]

@SamMonoRT It's a made up return code. We should return 0 for correctness.

[akoeplinger]

Good job, left a few comments. The biggest issue for me is the Publish->Build change.

[MaximLipnin]

Strange error on ios lane:

2020-12-10T14:31:44.3629640Z /Users/runner/work/1/s/eng/testing/tests.mobile.targets(117,5): error MSB4018: The "AppleAppBuilderTask" task failed unexpectedly. [/Users/runner/work/1/s/src/libraries/System.Private.Xml.Linq/tests/events/System.Xml.Linq.Events.Tests.csproj]
2020-12-10T14:31:44.3734380Z /Users/runner/work/1/s/eng/testing/tests.mobile.targets(117,5): error MSB4018: System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. (Parameter 'chunkLength') [/Users/runner/work/1/s/src/libraries/System.Private.Xml.Linq/tests/events/System.Xml.Linq.Events.Tests.csproj]
2020-12-10T14:31:44.3736450Z /Users/runner/work/1/s/eng/testing/tests.mobile.targets(117,5): error MSB4018:    at System.Text.StringBuilder.ToString() [/Users/runner/work/1/s/src/libraries/System.Private.Xml.Linq/tests/events/System.Xml.Linq.Events.Tests.csproj]
2020-12-10T14:31:44.3838790Z /Users/runner/work/1/s/eng/testing/tests.mobile.targets(117,5): error MSB4018:    at Utils.RunProcess(String path, String args, IDictionary`2 envVars, String workingDir, Boolean ignoreErrors) in /_/src/tasks/AppleAppBuilder/Utils.cs:line 75 [/Users/runner/work/1/s/src/libraries/System.Private.Xml.Linq/tests/events/System.Xml.Linq.Events.Tests.csproj]
2020-12-10T14:31:44.3941870Z /Users/runner/work/1/s/eng/testing/tests.mobile.targets(117,5): error MSB4018:    at Xcode..ctor(String target) in /_/src/tasks/AppleAppBuilder/Xcode.cs:line 18 [/Users/runner/work/1/s/src/libraries/System.Private.Xml.Linq/tests/events/System.Xml.Linq.Events.Tests.csproj]
2020-12-10T14:31:44.3958970Z /Users/runner/work/1/s/eng/testing/tests.mobile.targets(117,5): error MSB4018:    at AppleAppBuilderTask.Execute() in /_/src/tasks/AppleAppBuilder/AppleAppBuilder.cs:line 175 [/Users/runner/work/1/s/src/libraries/System.Private.Xml.Linq/tests/events/System.Xml.Linq.Events.Tests.csproj]
2020-12-10T14:31:44.4021940Z /Users/runner/work/1/s/eng/testing/tests.mobile.targets(117,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() [/Users/runner/work/1/s/src/libraries/System.Private.Xml.Linq/tests/events/System.Xml.Linq.Events.Tests.csproj]
2020-12-10T14:31:44.4052500Z /Users/runner/work/1/s/eng/testing/tests.mobile.targets(117,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask) [/Users/runner/work/1/s/src/libraries/System.Private.Xml.Linq/tests/events/System.Xml.Linq.Events.Tests.csproj]

[MaximLipnin]

The PR is completely green now.

[MaximLipnin]

runtime-staging (Build iOS x64 Release AllSubsets_Mono) lane looks good.

https://dev.azure.com/dnceng/9ee6d478-d288-47f7-aacc-f6e6d082ae6d/_apis/build/builds/917369/logs/36
https://helix.dot.net/api/jobs/50a6e4a7-1764-4844-8b4f-b785ed0288b7/workitems/HelixController%20Work%20Queueing?api-version=2019-06-17
https://helixre107v0xdeko0k025g8.blob.core.windows.net/dotnet-runtime-refs-pull-44462-merge-50a6e4a7176448448b/HelloiOS/console.c94a3ae8.log?sv=2019-07-07&se=2020-12-31T08%3A49%3A45Z&sr=c&sp=rl&sig=aHbWhRurp7%2BOFfFLs44HWct6fJqaKxsYkayu7Bms2b0%3D