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Add a simplified version of ServerComponentRenderingTest.CanDispatchAsyncWorkToSyncContext (#21633) 

ServerComponentRenderingTest.CanDispatchAsyncWorkToSyncContext is quarantined but since it's not running on Helix there isn't any history available for it. With all the moving
parts in the server test, it's unclear if it's a product vs test setup issue.

Authoring a more simplified test so we can track test history. Note that it's starting off as quarantined because there's no evidence that the product code isn't broken

Fixes https://github.com/dotnet/aspnetcore/issues/19413
This commit is contained in:
Pranav K 2020-05-11 12:54:01 -07:00 committed by GitHub
parent cb83d5d155
commit 4b88074e30
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1 changed files with 30 additions and 0 deletions
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src/Components/Components/test/Rendering/RendererSynchronizationContextTest.cs
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@ -6,6 +6,7 @@ using System.Diagnostics;
using System.Globalization; using System.Globalization;
using System.Threading; using System.Threading;
using System.Threading.Tasks; using System.Threading.Tasks;
using Microsoft.AspNetCore.Testing;
using Xunit; using Xunit;
namespace Microsoft.AspNetCore.Components.Rendering namespace Microsoft.AspNetCore.Components.Rendering
@ -763,5 +764,34 @@ namespace Microsoft.AspNetCore.Components.Rendering
Assert.Equal(TaskStatus.Canceled, task.Status); Assert.Equal(TaskStatus.Canceled, task.Status);
await Assert.ThrowsAsync<TaskCanceledException>(async () => await task); await Assert.ThrowsAsync<TaskCanceledException>(async () => await task);
} }
[Fact]
[QuarantinedTest]
public async Task InvokeAsync_SyncWorkInAsyncTaskIsCompletedFirst()
{
// Simplified version of ServerComponentRenderingTest.CanDispatchAsyncWorkToSyncContext
var expected = "First Second Third Fourth Fifth";
var context = new RendererSynchronizationContext();
string actual;
// Act
await Task.Yield();
actual = "First";
var invokeTask = context.InvokeAsync(async () =>
{
// When the sync context is idle, queued work items start synchronously
actual += " Second";
await Task.Delay(250);
actual += " Fourth";
});
actual += " Third";
await invokeTask;
actual += " Fifth";
// Assert
Assert.Equal(expected, actual);
}
} }
} }