MonoTests.System.Runtime.Caching.CountersTest.Basic_Counters fail in CI

[eerhardt]

https://helix.dot.net/api/2019-06-17/jobs/b74d646c-0b23-426a-a216-4558f6f696dc/workitems/System.Runtime.Caching.Tests/console

https://dev.azure.com/dnceng/public/_build/results?buildId=1127816&view=logs&j=a68d6dca-d11c-59af-6c4a-cf852cb20e3a&t=28d89dec-7e09-5293-5fd2-aeb03e603264&l=55

C:\h\w\A5DB091B\w\AA940930\e>"C:\h\w\A5DB091B\p\dotnet.exe" exec --runtimeconfig System.Runtime.Caching.Tests.runtimeconfig.json --depsfile System.Runtime.Caching.Tests.deps.json xunit.console.dll System.Runtime.Caching.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing  
  Discovering: System.Runtime.Caching.Tests (method display = ClassAndMethod, method display options = None)
  Discovered:  System.Runtime.Caching.Tests (found 31 of 37 test cases)
  Starting:    System.Runtime.Caching.Tests (parallel test collections = on, max threads = 4)
    MonoTests.System.Runtime.Caching.MemoryCacheTest.PhysicalMemoryLimitNotSupported [SKIP]
      Condition(s) not met: "DoesNotSupportPhysicalMemoryMonitor"
    MonoTests.System.Runtime.Caching.CountersTest.Basic_Counters [FAIL]
      Assert.True() Failure
      Expected: True
      Actual:   False
      Stack Trace:
        /_/src/libraries/System.Runtime.Caching/tests/System.Runtime.Caching/CountersTest.cs(94,0): at MonoTests.System.Runtime.Caching.CountersTest.PollCounters(String cacheName)
        /_/src/libraries/System.Runtime.Caching/tests/System.Runtime.Caching/CountersTest.cs(49,0): at MonoTests.System.Runtime.Caching.CountersTest.Basic_Counters()
        /_/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs(1896,0): at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__140_0(Object state)
  Finished:    System.Runtime.Caching.Tests
=== TEST EXECUTION SUMMARY ===
   System.Runtime.Caching.Tests  Total: 31, Errors: 0, Failed: 1, Skipped: 1, Time: 7.586s

cc @StephenMolloy - looks like these tests were just added in #51760

[ericstj]

Another hit https://dev.azure.com/dnceng/public/_build/results?buildId=1128311&view=ms.vss-test-web.build-test-results-tab&runId=34278178&resultId=118890&paneView=debug.

[ericstj]

@StephenMolloy looks like this has 52 failures in the past day: https://runfo.azurewebsites.net/search/tests/?q=started%3A%7E2+definition%3Aruntime+result%3Afailed+name%3AMonoTests.System.Runtime.Caching.CountersTest.Basic_Counters

[steveisok]

The namespace confused me for a bit ;-)

[MihaZupan]

#52488 should fix this