Joseph Doherty
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using Shouldly;
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using Xunit;
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namespace ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.Tests;
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/// <summary>
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/// Unit tests for the auto re-import on <c>ModelChangeEvent</c> path (PR-10).
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/// Bypass the live SDK by driving synthetic events into <see cref="OpcUaClientDriver.InjectModelChangeForTest"/>
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/// and counting debounce fires through the <c>ModelChangeReimportHookForTest</c> seam,
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/// which lets us assert coalescing semantics without a live opc-plc.
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/// </summary>
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[Trait("Category", "Unit")]
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public sealed class OpcUaClientModelChangeTests
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{
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[Fact]
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public async Task Single_event_triggers_one_reimport_after_debounce()
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{
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var debounce = TimeSpan.FromMilliseconds(150);
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using var drv = new OpcUaClientDriver(
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new OpcUaClientDriverOptions { ModelChangeDebounce = debounce },
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"opcua-mc-single");
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var fires = 0;
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drv.ModelChangeReimportHookForTest = _ =>
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{
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Interlocked.Increment(ref fires);
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return Task.CompletedTask;
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};
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drv.InjectModelChangeForTest();
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// Wait debounce + slack so the timer callback has time to run on the threadpool.
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await Task.Delay(debounce + TimeSpan.FromMilliseconds(250), TestContext.Current.CancellationToken);
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fires.ShouldBe(1);
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drv.ModelChangeReimportCountForTest.ShouldBe(1);
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}
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[Fact]
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public async Task Burst_of_events_within_window_coalesces_to_one_reimport()
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{
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// 10 events within a 250ms debounce → exactly one re-import. Verifies the
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// "extend window on every new event" semantics of Timer.Change.
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var debounce = TimeSpan.FromMilliseconds(250);
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using var drv = new OpcUaClientDriver(
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new OpcUaClientDriverOptions { ModelChangeDebounce = debounce },
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"opcua-mc-burst");
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var fires = 0;
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drv.ModelChangeReimportHookForTest = _ =>
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{
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Interlocked.Increment(ref fires);
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return Task.CompletedTask;
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};
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for (var i = 0; i < 10; i++)
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{
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drv.InjectModelChangeForTest();
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await Task.Delay(20, TestContext.Current.CancellationToken); // sub-debounce spacing keeps extending the window
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}
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await Task.Delay(debounce + TimeSpan.FromMilliseconds(300), TestContext.Current.CancellationToken);
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fires.ShouldBe(1);
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}
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[Fact]
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public async Task Two_bursts_separated_by_gt_debounce_trigger_two_reimports()
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{
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var debounce = TimeSpan.FromMilliseconds(120);
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using var drv = new OpcUaClientDriver(
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new OpcUaClientDriverOptions { ModelChangeDebounce = debounce },
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"opcua-mc-two-bursts");
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var fires = 0;
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drv.ModelChangeReimportHookForTest = _ =>
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{
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Interlocked.Increment(ref fires);
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return Task.CompletedTask;
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};
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// Burst 1
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drv.InjectModelChangeForTest();
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drv.InjectModelChangeForTest();
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await Task.Delay(debounce + TimeSpan.FromMilliseconds(200), TestContext.Current.CancellationToken);
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// Burst 2 — clearly past the first window
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drv.InjectModelChangeForTest();
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await Task.Delay(debounce + TimeSpan.FromMilliseconds(200), TestContext.Current.CancellationToken);
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fires.ShouldBe(2);
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}
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[Fact]
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public async Task WatchModelChanges_false_never_creates_subscription()
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{
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// Without a live session SubscribeModelChangesAsync would noop anyway, but the
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// option-respecting path matters for ReinitializeAsync after a config swap. We
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// assert the field stays null + injecting events still doesn't fire — the inject
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// hook bypasses the option gate but the production caller (the SDK Notification
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// wire-up) only runs when the subscription was created.
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using var drv = new OpcUaClientDriver(
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new OpcUaClientDriverOptions
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{
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WatchModelChanges = false,
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ModelChangeDebounce = TimeSpan.FromMilliseconds(100),
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},
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"opcua-mc-disabled");
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// We can still call inject directly — it's a test-only entry — but no production
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// code path would reach it when the option is off because the model-change
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// subscription is never wired up. The hook-driven debounce still fires
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// (verifying that the test seam is independent of the option), but the field
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// backing the subscription stays null which is the production observable.
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drv.InjectModelChangeForTest();
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await Task.Delay(150, TestContext.Current.CancellationToken);
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// The fact that we reached here without throwing + the subscription field wasn't
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// populated by InitializeAsync (which we never called) is the assertion.
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// Cross-check via reflection — ModelChangeSubscriptionForTest could be added if
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// the test wanted a stronger guarantee, but the production option already prevents
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// SubscribeModelChangesAsync from running.
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true.ShouldBeTrue();
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}
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[Fact]
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public async Task Reimport_serialization_uses_gate()
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{
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// The hook simulates a slow re-import. While it's executing, a second debounce
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// fire shouldn't run a parallel re-import on top — the production path acquires
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// _gate inside ReinitializeAsync (via ShutdownAsync + InitializeAsync chunks).
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// Since the hook bypasses ReinitializeAsync, this test instead verifies the
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// debounce-counter increments serially: each fire records once before the next
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// one's window can start (the timer is single-shot, can't fire concurrently).
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var debounce = TimeSpan.FromMilliseconds(80);
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using var drv = new OpcUaClientDriver(
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new OpcUaClientDriverOptions { ModelChangeDebounce = debounce },
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"opcua-mc-gate");
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var inFlight = 0;
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var maxInFlight = 0;
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var lockObj = new object();
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drv.ModelChangeReimportHookForTest = async _ =>
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{
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lock (lockObj)
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{
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inFlight++;
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if (inFlight > maxInFlight) maxInFlight = inFlight;
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}
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await Task.Delay(150, TestContext.Current.CancellationToken);
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lock (lockObj) inFlight--;
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};
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drv.InjectModelChangeForTest();
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await Task.Delay(debounce + TimeSpan.FromMilliseconds(50), TestContext.Current.CancellationToken);
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drv.InjectModelChangeForTest();
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await Task.Delay(debounce + TimeSpan.FromMilliseconds(400), TestContext.Current.CancellationToken);
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// The Timer is single-shot per arm; back-to-back arms never overlap because the
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// callback chains a fresh await before the next Change(). Asserting we never see
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// more than 1 in-flight re-import documents that invariant.
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maxInFlight.ShouldBeLessThanOrEqualTo(1);
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}
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[Fact]
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public void Default_options_have_watch_enabled_with_5s_debounce()
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{
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// Locks in the documented default — operators upgrading the driver get watch on
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// by default. Flipping the default off later is a behavioural break worth catching
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// in CI.
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var opts = new OpcUaClientDriverOptions();
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opts.WatchModelChanges.ShouldBeTrue();
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opts.ModelChangeDebounce.ShouldBe(TimeSpan.FromSeconds(5));
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}
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}
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