Joseph Doherty
33 lines
1.4 KiB
C#
33 lines
1.4 KiB
C#
using Shouldly;
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using Xunit;
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using ZB.MOM.WW.OtOpcUa.Driver.Historian.Sql.Common;
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namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.QuestDb.Tests;
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public sealed class QuestDbSchemaBootstrapperFailureTests
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{
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private sealed class ManualClock : TimeProvider
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{
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private DateTimeOffset _now = new(2026, 10, 11, 0, 0, 0, TimeSpan.Zero);
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public override DateTimeOffset GetUtcNow() => _now;
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public void Advance(TimeSpan by) => _now += by;
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}
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[Fact]
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public async Task A_failure_is_cached_for_five_seconds_then_retried()
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{
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var opts = new QuestDbHistorianOptions { ConnectionString = "Host=127.0.0.1;Port=1;Timeout=1" };
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var clock = new ManualClock();
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var boot = new QuestDbSchemaBootstrapper(new QuestDbConnection(opts), opts, timeProvider: clock);
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var first = await Should.ThrowAsync<Exception>(() => boot.EnsureAsync(CancellationToken.None));
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// Within the window the SAME failure is re-thrown without another connection attempt.
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var second = await Should.ThrowAsync<Exception>(() => boot.EnsureAsync(CancellationToken.None));
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second.ShouldBeSameAs(first);
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clock.Advance(BootstrapFailureCache.DefaultDuration + TimeSpan.FromSeconds(1));
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var third = await Should.ThrowAsync<Exception>(() => boot.EnsureAsync(CancellationToken.None));
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third.ShouldNotBeSameAs(first); // the window closed: QuestDB was tried again
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}
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}
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