[Flaky test] Microsoft.AspNetCore.Components.E2ETest.Tests.ServerComponentRenderingTest.CanDispatchAsyncWorkToSyncContext

[pranavkm]

OpenQA.Selenium.BrowserAssertFailedException : Xunit.Sdk.EqualException: Assert.Equal() Failure
Expected: First Second Third Fourth Fifth
Actual: First Third Second Fourth Fifth
 at Xunit.Assert.Equal[T](T expected, T actual, IEqualityComparer1 comparer) in C:\\Dev\\xunit\\xunit\\src\\xunit.assert\\Asserts\\EqualityAsserts.cs:line 40
 at Microsoft.AspNetCore.E2ETesting.WaitAssert.<>c__DisplayClass15_0.<WaitAssertCore>b__0() in /_/src/Shared/E2ETesting/WaitAssert.cs:line 74
 at Microsoft.AspNetCore.E2ETesting.WaitAssert.<>c__DisplayClass16_01.<WaitAssertCore>b__0(IWebDriver ) in //src/Shared/E2ETesting/WaitAssert.cs:line 100
Screen shot captured at 'F:\workspace\_work\1\s\artifacts\TestResults\Release\Microsoft.AspNetCore.Components.E2ETests\ffc965db3a5543769a0d18c0fc6979a5.png'
Encountered browser errors
[2020-02-24T18:55:43Z] [Info] http://127.0.0.1:53627/subdir/_framework/blazor.server.js 0:5359 "[2020-02-24T18:55:43.182Z] Information: Normalizing '_blazor' to 'http://127.0.0.1:53627/subdir/_blazor'."
[2020-02-24T18:55:43Z] [Info] http://127.0.0.1:53627/subdir 40:16 "Blazor server-side"
[2020-02-24T18:55:43Z] [Info] http://127.0.0.1:53627/subdir/_framework/blazor.server.js 0:5359 "[2020-02-24T18:55:43.213Z] Information: WebSocket connected to ws://127.0.0.1:53627/subdir/_blazor?id=Ry9n2ACm2uMoxx1gpL9GKw."
[2020-02-24T18:56:34Z] [Info] http://127.0.0.1:53627/subdir/_framework/blazor.server.js 0:5359 "[2020-02-24T18:56:34.626Z] Information: Normalizing '_blazor' to 'http://127.0.0.1:53627/subdir/_blazor'."
[2020-02-24T18:56:34Z] [Info] http://127.0.0.1:53627/subdir 40:16 "Blazor server-side"
[2020-02-24T18:56:34Z] [Info] http://127.0.0.1:53627/subdir/_framework/blazor.server.js 0:5359 "[2020-02-24T18:56:34.654Z] Information: WebSocket connected to ws://127.0.0.1:53627/subdir/_blazor?id=PET4EBDBBhrHEMRGjB0kiQ."
[2020-02-24T18:56:48Z] [Info] http://127.0.0.1:53627/subdir/_framework/blazor.server.js 0:5359 "[2020-02-24T18:56:48.254Z] Information: Normalizing '_blazor' to 'http://127.0.0.1:53627/subdir/_blazor'."
[2020-02-24T18:56:48Z] [Info] http://127.0.0.1:53627/subdir 40:16 "Blazor server-side"
[2020-02-24T18:56:48Z] [Info] http://127.0.0.1:53627/subdir/_framework/blazor.server.js 0:5359 "[2020-02-24T18:56:48.265Z] Information: WebSocket connected to ws://127.0.0.1:53627/subdir/_blazor?id=d65jH65Sn0IFiEq46GfW1w."
[2020-02-24T18:57:00Z] [Info] http://127.0.0.1:53627/subdir/_framework/blazor.server.js 0:5359 "[2020-02-24T18:57:00.170Z] Information: Normalizing '_blazor' to 'http://127.0.0.1:53627/subdir/_blazor'."
[2020-02-24T18:57:00Z] [Info] http://127.0.0.1:53627/subdir 40:16 "Blazor server-side"
[2020-02-24T18:57:00Z] [Info] http://127.0.0.1:53627/subdir/_framework/blazor.server.js 0:5359 "[2020-02-24T18:57:00.180Z] Information: WebSocket connected to ws://127.0.0.1:53627/subdir/_blazor?id=vTsyJjvIft0oTdf4_tmxEQ."
[2020-02-24T18:57:09Z] [Info] http://127.0.0.1:53627/subdir/_framework/blazor.server.js 0:5359 "[2020-02-24T18:57:09.872Z] Information: Normalizing '_blazor' to 'http://127.0.0.1:53627/subdir/_blazor'."
[2020-02-24T18:57:09Z] [Info] http://127.0.0.1:53627/subdir 40:16 "Blazor server-side"
[2020-02-24T18:57:09Z] [Info] http://127.0.0.1:53627/subdir/_framework/blazor.server.js 0:5359 "[2020-02-24T18:57:09.884Z] Information: WebSocket connected to ws://127.0.0.1:53627/subdir/_blazor?id=GGGDWY1bGOM_hXxWaDf3IA."
[2020-02-24T18:57:17Z] [Info] http://127.0.0.1:53627/subdir/_framework/blazor.server.js 0:5359 "[2020-02-24T18:57:17.044Z] Information: Normalizing '_blazor' to 'http://127.0.0.1:53627/subdir/_blazor'."
[2020-02-24T18:57:17Z] [Info] http://127.0.0.1:53627/subdir 40:16 "Blazor server-side"
[2020-02-24T18:57:17Z] [Info] http://127.0.0.1:53627/subdir/_framework/blazor.server.js 0:5359 "[2020-02-24T18:57:17.057Z] Information: WebSocket connected to ws://127.0.0.1:53627/subdir/_blazor?id=

[pranavkm]

We'll need to instrument the dispatcher to figure out what's going on here. The test assumes no other work is queued to the dispatcher as part of running the test which might not be always true.