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fix: resolve TestKit startup timeout race condition #705

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Merged
Aaronontheweb merged 2 commits into from
Jan 26, 2026
Merged

fix: resolve TestKit startup timeout race condition #705

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7a12a28
fix: resolve TestKit startup timeout race condition
Aaronontheweb Jan 26, 2026
9ab45e6
Merge branch 'dev' into fix/testkit-startup-timeout-race
Aaronontheweb Jan 26, 2026
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18 changes: 11 additions & 7 deletions src/Akka.Hosting.TestKit/TestKit.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -77,7 +77,7 @@ protected TestKit(string? actorSystemName = null, ITestOutputHelper? output = nu
ActorSystemName = actorSystemName ?? "test";
Output = output;
LogLevel = logLevel;
StartupTimeout = startupTimeout ?? TimeSpan.FromSeconds(10);
StartupTimeout = startupTimeout ?? TimeSpan.FromSeconds(30);
}

protected virtual void ConfigureHostConfiguration(IConfigurationBuilder builder)
Expand Down Expand Up @@ -181,19 +181,23 @@ public async Task InitializeAsync()

_host = hostBuilder.Build();

var cts = new CancellationTokenSource(StartupTimeout);
cts.Token.Register(() =>
throw new TimeoutException($"Host failed to start within {StartupTimeout.Seconds} seconds"));
using var cts = new CancellationTokenSource(StartupTimeout);
try
{
await _host.StartAsync(cts.Token);
}
finally
catch (OperationCanceledException) when (cts.IsCancellationRequested)
{
cts.Dispose();
throw new TimeoutException($"Host failed to start within {StartupTimeout.TotalSeconds} seconds");
}

await _initialized.Task;
// Wait for Akka initialization with timeout
var initializedTask = _initialized.Task;
var timeoutTask = Task.Delay(StartupTimeout, CancellationToken.None);
if (await Task.WhenAny(initializedTask, timeoutTask) == timeoutTask)
{
throw new TimeoutException($"Akka.NET failed to initialize within {StartupTimeout.TotalSeconds} seconds");
}

// TestActor initialization and registration now happens in AddStartup
// before user actors are created, preventing race conditions
Expand Down