Joseph Doherty
47 lines
2.1 KiB
C#
47 lines
2.1 KiB
C#
using Akka.Actor;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Logging;
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using Microsoft.Extensions.Logging.Abstractions;
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using Microsoft.Extensions.Options;
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using ZB.MOM.WW.ScadaBridge.ClusterInfrastructure;
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using ZB.MOM.WW.ScadaBridge.Communication;
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using ZB.MOM.WW.ScadaBridge.Host;
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using ZB.MOM.WW.ScadaBridge.Host.Actors;
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namespace ZB.MOM.WW.ScadaBridge.Host.Tests;
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/// <summary>
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/// Verifies the DI bridge that exposes the Akka <see cref="ActorSystem"/> — owned by
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/// <see cref="AkkaHostedService"/>, not registered as a DI singleton — to consumers that
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/// resolve <c>ActorSystem</c> from the container (notably the shared ZB.MOM.WW.Health Akka
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/// checks). The bridge is registered TRANSIENT so each resolve re-reads the current value:
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/// null while the hosted service is warming up (checks treat that as Degraded), the live
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/// system afterwards. A SINGLETON would cache the startup-time null forever.
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/// </summary>
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public sealed class ActorSystemBridgeTests
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{
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[Fact]
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public void ActorSystem_ResolvesNull_BeforeHostedServiceStarts()
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{
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var services = new ServiceCollection();
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// Register AkkaHostedService the same way Program.cs does, supplying the minimal
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// constructor dependencies so the container can build it. Its ActorSystem property
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// is null until StartAsync runs — which it never does here.
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services.AddSingleton(Options.Create(new NodeOptions()));
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services.AddSingleton(Options.Create(new ClusterOptions()));
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services.AddSingleton(Options.Create(new CommunicationOptions()));
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services.AddSingleton<ILogger<AkkaHostedService>>(NullLogger<AkkaHostedService>.Instance);
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services.AddSingleton<AkkaHostedService>();
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// The bridge under test: TRANSIENT factory that re-reads the owned ActorSystem.
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services.AddTransient<ActorSystem>(sp =>
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sp.GetRequiredService<AkkaHostedService>().ActorSystem!);
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using var provider = services.BuildServiceProvider();
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// The hosted service has not started, so the bridge must yield null (not throw).
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Assert.Null(provider.GetService<ActorSystem>());
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}
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}
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