Joseph Doherty
87 lines
3.1 KiB
C#
87 lines
3.1 KiB
C#
using Microsoft.Extensions.Logging.Abstractions;
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using Shouldly;
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using Xunit;
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using ZB.MOM.WW.OtOpcUa.AdminUI.Browsing;
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namespace ZB.MOM.WW.OtOpcUa.AdminUI.Tests.Browsing;
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/// <summary>Unit tests for <see cref="BrowseSessionReaper"/>. We drive the reaper
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/// directly through the internal <c>ReapOnceAsync</c> entry point and skew
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/// <see cref="FakeBrowseSession.LastUsedUtc"/> to simulate the passage of time —
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/// no real wall-clock waits.</summary>
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public sealed class BrowseSessionReaperTests
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{
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private static BrowseSessionReaper NewReaper(BrowseSessionRegistry registry) =>
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new(registry, NullLogger<BrowseSessionReaper>.Instance);
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[Fact]
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public async Task ReapOnceAsync_evicts_idle_session()
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{
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var registry = new BrowseSessionRegistry();
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var session = new FakeBrowseSession
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{
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LastUsedUtc = DateTime.UtcNow - TimeSpan.FromMinutes(3),
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};
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registry.Register(session);
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var reaper = NewReaper(registry);
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await reaper.ReapOnceAsync(CancellationToken.None);
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registry.TryGet(session.Token, out _).ShouldBeFalse();
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session.Disposed.ShouldBeTrue();
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}
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[Fact]
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public async Task ReapOnceAsync_preserves_recent_session()
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{
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var registry = new BrowseSessionRegistry();
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var session = new FakeBrowseSession { LastUsedUtc = DateTime.UtcNow };
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registry.Register(session);
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var reaper = NewReaper(registry);
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await reaper.ReapOnceAsync(CancellationToken.None);
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registry.TryGet(session.Token, out _).ShouldBeTrue();
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session.Disposed.ShouldBeFalse();
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}
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[Fact]
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public async Task ReapOnceAsync_handles_already_removed_session()
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{
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var registry = new BrowseSessionRegistry();
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var session = new FakeBrowseSession
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{
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LastUsedUtc = DateTime.UtcNow - TimeSpan.FromMinutes(3),
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};
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registry.Register(session);
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// Race the reaper: pull the entry out before the loop calls TryRemove.
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registry.TryRemove(session.Token, out _).ShouldBeTrue();
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var reaper = NewReaper(registry);
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// No exception, no double dispose. Because we removed the session ourselves
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// without disposing it, Disposed should still be false.
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await reaper.ReapOnceAsync(CancellationToken.None);
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session.Disposed.ShouldBeFalse();
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}
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[Fact]
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public async Task ReapOnceAsync_continues_when_one_session_dispose_throws()
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{
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var registry = new BrowseSessionRegistry();
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var staleAt = DateTime.UtcNow - TimeSpan.FromMinutes(3);
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var bad = new FakeBrowseSession { LastUsedUtc = staleAt, ThrowOnDispose = true };
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var good = new FakeBrowseSession { LastUsedUtc = staleAt };
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registry.Register(bad);
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registry.Register(good);
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var reaper = NewReaper(registry);
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// The dispose exception is swallowed; the second session must still be reaped + disposed.
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await Should.NotThrowAsync(() => reaper.ReapOnceAsync(CancellationToken.None));
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registry.TryGet(bad.Token, out _).ShouldBeFalse();
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registry.TryGet(good.Token, out _).ShouldBeFalse();
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good.Disposed.ShouldBeTrue();
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}
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}
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