Fix flaky routing test

[jkotalik]

Bunch of helix tests failing due to newlines not matching https://mc.dot.net/#/user/aspnetcore/pr~2Faspnet~2Faspnetcore/ci/20190417.64/workItem/Microsoft.AspNetCore.Routing.Tests-netcoreapp3.0/wilogs.

I think this is because on helix, we build the dlls on windows and then test on linux, so \r\n gets compiled in.

[analogrelay]

I think you're exactly right about why.

[jkotalik]

Ouch, test failure I got here doesn't look good. Looks the same as https://github.com/aspnet/AspNetCore-Internal/issues/2224. I miss labeled that issue.

  
  Starting test group: Kestrel.Core.Tests/netcoreapp3.0
  Microsoft (R) Test Execution Command Line Tool Version 16.0.1
  Copyright (c) Microsoft Corporation.  All rights reserved.
  
  Starting test execution, please wait...
  [xUnit.net 00:00:00.62] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.HPackEncoderTests.EncodesHeadersInSinglePayloadWhenSpaceAvailable'; falling back to single test case.
  [xUnit.net 00:00:00.63] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.Http1ConnectionTests.ConfiguringIHttpMinRequestBodyDataRateFeatureSetsMinRequestBodyDataRate'; falling back to single test case.
  [xUnit.net 00:00:00.63] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.Http1ConnectionTests.ConfiguringIHttpMinResponseDataRateFeatureSetsMinResponseDataRate'; falling back to single test case.
  [xUnit.net 00:00:00.71] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.HttpRequestHeadersTests.ValueReuseOnlyWhenAllowed'; falling back to single test case.
  [xUnit.net 00:00:00.71] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.HttpRequestHeadersTests.ValueReuseChangedValuesOverwrite'; falling back to single test case.
  [xUnit.net 00:00:00.71] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.HttpRequestHeadersTests.ValueReuseMissingValuesClear'; falling back to single test case.
  [xUnit.net 00:00:00.71] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.HttpRequestHeadersTests.ValueReuseNeverWhenNotAscii'; falling back to single test case.
  [xUnit.net 00:00:00.71] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.HttpRequestHeadersTests.ValueReuseLatin1NotConfusedForUtf16AndStillRejected'; falling back to single test case.
  [xUnit.net 00:00:00.71] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.HttpRequestHeadersTests.ValueReuseEmptyAfterReset'; falling back to single test case.
  [xUnit.net 00:00:00.71] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.HttpRequestHeadersTests.MultiValueReuseEmptyAfterReset'; falling back to single test case.
  [xUnit.net 00:00:00.74] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.KestrelServerLimitsTests.KeepAliveTimeoutValid'; falling back to single test case.
  [xUnit.net 00:00:00.74] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.KestrelServerLimitsTests.KeepAliveTimeoutInvalid'; falling back to single test case.
  [xUnit.net 00:00:00.74] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.KestrelServerLimitsTests.RequestHeadersTimeoutValid'; falling back to single test case.
  [xUnit.net 00:00:00.74] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.KestrelServerLimitsTests.RequestHeadersTimeoutInvalid'; falling back to single test case.
  [xUnit.net 00:00:00.75] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.MinDataRateTests.GracePeriodValid'; falling back to single test case.
  [xUnit.net 00:00:00.75] Microsoft.AspNetCore.Server.Kestrel.Core.Tests: Non-serializable data ('System.Object[]') found for 'Microsoft.AspNetCore.Server.Kestrel.Core.Tests.MinDataRateTests.GracePeriodInvalid'; falling back to single test case.
  The active test run was aborted. Reason: Unhandled Exception: System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
     at System.Buffers.MemoryPoolBlock..ctor(SlabMemoryPool pool, MemoryPoolSlab slab, Int32 offset, Int32 length) in /_/src/Shared/Buffers.MemoryPool/MemoryPoolBlock.cs:line 20
     at System.Buffers.MemoryPoolBlock.Finalize() in /_/src/Shared/Buffers.MemoryPool/MemoryPoolBlock.cs:line 48
  
  Results File: F:\workspace\_work\1\s\artifacts\logs\Kestrel.Core.Tests-netcoreapp3.0-20190418.6_2019-04-18_16-56-56-715.trx
  
  Total tests: Unknown. Passed: 3524. Failed: 0. Skipped: 0.
  Test Run Aborted.
  Test execution time: 8.0209 Seconds
F:\workspace\_work\1\s\.dotnet\buildtools\kore

[rynowak]

FYI there's also an extra parameter you can pass that specifies whether to ignore newlin differences. I'm not sure how this got missed by the CI when I wrote the test, but #YOLO

[jkotalik]

It didn't get missed, is that helix isn't in your face about failures. I'll be changing that shortly with #9187.