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Fix flaky AddIncomingMessageFilter_Multiple_Filters_Execute_In_Order test (#1627)

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Co-authored-by: Tarek Mahmoud Sayed <tarekms@ntdev.microsoft.com>
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Tarek Mahmoud Sayed 2026-06-04 15:06:16 -07:00 • committed by GitHub
commit 719eade5e0
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1 changed files with 15 additions and 0 deletions
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15
tests/ModelContextProtocol.Tests/Configuration/McpServerBuilderExtensionsMessageFilterTests.cs
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@ -100,6 +100,12 @@ public class McpServerBuilderExtensionsMessageFilterTests(ITestOutputHelper test
[Fact]
public async Task AddIncomingMessageFilter_Multiple_Filters_Execute_In_Order()
{
// The client sends notifications/initialized fire-and-forget, so unlike the initialize and
// tools/list request/response exchanges it has no synchronization point the test can await.
// Signal once the outermost filter finishes processing it so the strict counts below observe a
// complete, stable log instead of racing the still-in-flight notification.
var initializedNotificationProcessed = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);
McpServerBuilder
.WithMessageFilters(filters =>
{
@ -109,6 +115,11 @@ public class McpServerBuilderExtensionsMessageFilterTests(ITestOutputHelper test
logger.LogInformation("MessageFilter1 before");
await next(context, cancellationToken);
logger.LogInformation("MessageFilter1 after");
if (context.JsonRpcMessage is JsonRpcNotification { Method: NotificationMethods.InitializedNotification })
{
initializedNotificationProcessed.TrySetResult(true);
}
});
filters.AddIncomingFilter((next) => async (context, cancellationToken) =>
@ -127,6 +138,10 @@ public class McpServerBuilderExtensionsMessageFilterTests(ITestOutputHelper test
await client.ListToolsAsync(cancellationToken: TestContext.Current.CancellationToken);
// Wait for the fire-and-forget initialized notification to flow through the filter pipeline
// before snapshotting the log; otherwise the strict counts below can race the notification.
await initializedNotificationProcessed.Task.WaitAsync(TestConstants.DefaultTimeout, TestContext.Current.CancellationToken);
var logMessages = MockLoggerProvider.LogMessages
.Where(m => m.Category.StartsWith("MessageFilter"))
.Select(m => m.Message)