Test Failure: UnloadingAndProcessExitTests on UAP not firing unloading events

[nchikanov]

Discovered failing test case in UWP CoreCLR x64 Debug Build
(https://mc.dot.net/#/user/nchikanov/pr~2Fjenkins~2Fdotnet~2Fcorefx~2Fmaster~2F/test~2Ffunctional~2Fcli~2F/eea80bba9af50534e761788810fef3c3335cff4f/workItem/System.Runtime.Extensions.Tests/analysis/xunit/System.Tests.UnloadingAndProcessExitTests~2FUnloadingEventMustHappenBeforeProcessExitEvent)

Xunit.Sdk.EqualException Windows.10.Amd64.ClientRS2.Open-Debug-x64 Unhandled Exception of Type Xunit.Sdk.EqualException Message : Assert.Equal() Failure\r\n ? (pos 0)\r\nExpected: \r\nActual: u0u1e0e1\r\n ? (pos 0) Stack Trace : at System.Tests.UnloadingAndProcessExitTests.UnloadingEventMustHappenBeforeProcessExitEvent() in D:\j\workspace\windows-TGrou---33cbf18b\src\System.Runtime.Extensions\tests\System\UnloadingAndProcessExitTests.netcoreapp.cs:line 34

This test can be improved to help narrow down a repro:

1. The Assert is backwards - expected is u0u1e0e1
2. Should dump "s" to the file before hooking the events and "h" after hooking- that way we could see if the events simply aren't firing.
   e.g. result should be "shu0u1e0e1"

That will make it easier to follow up on continued failures

[danmoseley]

Good suggestions @nchikanov go for it :)

[stephentoub]

Failed again here:
https://mc.dot.net/#/user/dotnet-maestro-bot/pr~2Fjenkins~2Fdotnet~2Fcorefx~2Fmaster~2F/test~2Ffunctional~2Fcli~2F/711f39a92e13e80186a30412b4a3fe472ecad4d6/workItem/System.Runtime.Extensions.Tests/analysis/xunit/System.Tests.UnloadingAndProcessExitTests~2FUnloadingEventMustHappenBeforeProcessExitEvent

[stephentoub]

Failed again here:
https://ci3.dot.net/job/dotnet_corefx/job/master/job/windows-TGroup_uap+CGroup_Debug+AGroup_x64+TestOuter_false_prtest/2415/

[nchikanov]

Failed again here: https://mc.dot.net/#/user/nchikanov/pr~2Fjenkins~2Fdotnet~2Fcorefx~2Fmaster~2F/test~2Ffunctional~2Fcli~2F/df75bbb0de79082981b77df396e6618273fcbc4d/workItem/System.Runtime.Extensions.Tests/analysis/xunit/System.Tests.UnloadingAndProcessExitTests~2FUnloadingEventMustHappenBeforeProcessExitEvent

[danmoseley]

uh I guess it's not just UAP

https://mc.dot.net/#/user/dotnet-maestro-bot/pr~2Fjenkins~2Fdotnet~2Fcorefx~2Fmaster~2F/test~2Ffunctional~2Fcli~2F/cd117388176102f637796853ad3fb045de864616/workItem/System.Runtime.Extensions.Tests/analysis/xunit/System.Tests.UnloadingAndProcessExitTests~2FUnloadingEventMustHappenBeforeProcessExitEvent

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