test: remaining xUnit1051/1031/1030, CS8602/8604, CS0618, CS0219, CS0649, NU1510 fixes (lmxopcua#725)

Awaited deadline oracles get the runner token; sync-over-async tests made async;
nullable child models asserted via ShouldNotBeNull() return values; obsolete SDK
ctors replaced with the telemetry overloads; dead locals/fixture and the redundant
DI PackageReference removed. No suppressions.

Claude-Session: https://claude.ai/code/session_01GT67AEHd2Acv1YPwGfXEoV

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS.Tests/FocasLowFindingsTests.cs

@@ -129,7 +129,7 @@ public sealed class FocasLowFindingsTests
         // timeout fix, this never completes (Probe runs forever).
         var cancelled = await Task.WhenAny(
             hangSignal.Task,
-            Task.Delay(TimeSpan.FromSeconds(2))) == hangSignal.Task;
+            Task.Delay(TimeSpan.FromSeconds(2), TestContext.Current.CancellationToken)) == hangSignal.Task;
 
         await drv.ShutdownAsync(CancellationToken.None);
 

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Browse/DeployWatcherTests.cs

@@ -237,7 +237,7 @@ public sealed class DeployWatcherTests
 
         // StopAsync should complete without throwing and within a reasonable window.
         var stopTask = watcher.StopAsync();
-        var completed = await Task.WhenAny(stopTask, Task.Delay(TimeSpan.FromSeconds(5)));
+        var completed = await Task.WhenAny(stopTask, Task.Delay(TimeSpan.FromSeconds(5), TestContext.Current.CancellationToken));
         completed.ShouldBe(stopTask);
         await stopTask; // observe (no) exception
     }
@@ -256,7 +256,7 @@ public sealed class DeployWatcherTests
 
         // Should not throw, should not hang.
         var disposeTask = Task.Run(watcher.Dispose, TestContext.Current.CancellationToken);
-        var completed = await Task.WhenAny(disposeTask, Task.Delay(TimeSpan.FromSeconds(5)));
+        var completed = await Task.WhenAny(disposeTask, Task.Delay(TimeSpan.FromSeconds(5), TestContext.Current.CancellationToken));
         completed.ShouldBe(disposeTask);
         await disposeTask;
     }

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Health/HostStatusAggregatorTests.cs

@@ -124,7 +124,7 @@ public sealed class HostStatusAggregatorTests
 
     /// <summary>Verifies that concurrent updates do not corrupt the internal dictionary.</summary>
     [Fact]
-    public void ConcurrentUpdates_DoNotCorruptDictionary()
+    public async Task ConcurrentUpdates_DoNotCorruptDictionary()
     {
         var agg = new HostStatusAggregator();
         const int threadCount = 8;
@@ -138,9 +138,9 @@ public sealed class HostStatusAggregatorTests
                 var state = i % 2 == 0 ? HostState.Running : HostState.Stopped;
                 agg.Update(Status(hostName, state));
             }
-        })).ToArray();
+        }, TestContext.Current.CancellationToken)).ToArray();
 
-        Task.WaitAll(tasks, TestContext.Current.CancellationToken);
+        await Task.WhenAll(tasks).WaitAsync(TestContext.Current.CancellationToken);
         agg.Snapshot().Count.ShouldBeLessThanOrEqualTo(32);
     }
 }

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/EventPumpDispatchFaultTests.cs

@@ -66,7 +66,7 @@ public sealed class EventPumpDispatchFaultTests
 
         await subscriber.EmitAsync(7);
 
-        (await Task.WhenAny(fault.Task, Task.Delay(WaitMs))).ShouldBe(fault.Task,
+        (await Task.WhenAny(fault.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(fault.Task,
             "a dispatch-loop exit must be reported as a stream fault");
         (await fault.Task).ShouldBeOfType<InvalidDataException>();
     }
@@ -89,7 +89,7 @@ public sealed class EventPumpDispatchFaultTests
 
         await subscriber.EmitAsync(7);
 
-        (await Task.WhenAny(delivered.Task, Task.Delay(WaitMs))).ShouldBe(delivered.Task);
+        (await Task.WhenAny(delivered.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(delivered.Task);
         (await delivered.Task).FullReference.ShouldBe("Tank01.Level");
         faulted.ShouldBeFalse();
     }

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/EventPumpReplayGapTests.cs

@@ -57,7 +57,7 @@ public sealed class EventPumpReplayGapTests
 
         await subscriber.EmitAsync(GapSentinel(requestedAfter: 100, oldestAvailable: 250));
 
-        (await Task.WhenAny(observed.Task, Task.Delay(WaitMs))).ShouldBe(observed.Task,
+        (await Task.WhenAny(observed.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(observed.Task,
             "a replay-gap sentinel must reach the driver so it can re-snapshot");
         var gap = await observed.Task;
         gap.RequestedAfterSequence.ShouldBe(100UL);
@@ -93,7 +93,7 @@ public sealed class EventPumpReplayGapTests
         pump.Start();
 
         await subscriber.EmitAsync(GapSentinel(requestedAfter: 1, oldestAvailable: 2));
-        (await Task.WhenAny(gapSeen.Task, Task.Delay(WaitMs))).ShouldBe(gapSeen.Task);
+        (await Task.WhenAny(gapSeen.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(gapSeen.Task);
 
         // A positive control: follow the sentinel with a real event on the same handle. Without
         // it, "nothing was dispatched" would also pass on a pump that dispatches nothing at all.
@@ -106,7 +106,7 @@ public sealed class EventPumpReplayGapTests
             SourceTimestamp = Timestamp.FromDateTime(DateTime.UtcNow),
         });
 
-        (await Task.WhenAny(realValue.Task, Task.Delay(WaitMs))).ShouldBe(realValue.Task,
+        (await Task.WhenAny(realValue.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(realValue.Task,
             "the pump must keep dispatching real events after a sentinel");
         (await realValue.Task).Snapshot.Value.ShouldBe(12.5);
         Volatile.Read(ref dispatched).ShouldBe(1, "only the real event may be dispatched, never the sentinel");
@@ -149,7 +149,7 @@ public sealed class EventPumpReplayGapTests
 
         await subscriber.EmitAsync(GapSentinel(requestedAfter: 5, oldestAvailable: 900));
 
-        (await Task.WhenAny(observed.Task, Task.Delay(WaitMs))).ShouldBe(observed.Task,
+        (await Task.WhenAny(observed.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(observed.Task,
             "the sentinel must not be droppable by channel back-pressure");
         (await observed.Task).OldestAvailableSequence.ShouldBe(900UL);
 
@@ -187,7 +187,7 @@ public sealed class EventPumpReplayGapTests
             Quality = 192,
         });
 
-        (await Task.WhenAny(resumed.Task, Task.Delay(WaitMs))).ShouldBe(resumed.Task,
+        (await Task.WhenAny(resumed.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(resumed.Task,
             "a failed re-snapshot must not stop the stream that is still delivering");
         faulted.ShouldBeFalse("a throwing gap callback is not a transport fault");
     }
@@ -217,7 +217,7 @@ public sealed class EventPumpReplayGapTests
 
         subscriber.CompleteStream();
 
-        (await Task.WhenAny(faultObserved.Task, Task.Delay(WaitMs))).ShouldBe(faultObserved.Task,
+        (await Task.WhenAny(faultObserved.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(faultObserved.Task,
             "a server-completed stream is as fatal as a faulted one and must reach the supervisor");
         (await faultObserved.Task).Message.ShouldContain("closed or evicted");
     }
@@ -277,7 +277,7 @@ public sealed class EventPumpReplayGapTests
             SourceTimestamp = Timestamp.FromDateTime(DateTime.UtcNow),
         });
 
-        (await Task.WhenAny(bothSeen.Task, Task.Delay(WaitMs))).ShouldBe(bothSeen.Task);
+        (await Task.WhenAny(bothSeen.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(bothSeen.Task);
 
         lock (received)
         {

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/EventPumpStreamFaultTests.cs

@@ -35,7 +35,7 @@ public sealed class EventPumpStreamFaultTests
         // Drop the gw stream — RunAsync's await foreach throws.
         subscriber.FaultStream(new IOException("simulated gateway transport drop"));
 
-        var completed = await Task.WhenAny(faultObserved.Task, Task.Delay(WaitMs));
+        var completed = await Task.WhenAny(faultObserved.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken));
         completed.ShouldBe(faultObserved.Task,
             "EventPump must invoke onStreamFault when the gw StreamEvents stream faults");
         (await faultObserved.Task).ShouldBeOfType<IOException>();
@@ -69,9 +69,9 @@ public sealed class EventPumpStreamFaultTests
 
         subscriber.FaultStream(new IOException("simulated gateway transport drop"));
 
-        (await Task.WhenAny(reopenRan.Task, Task.Delay(WaitMs))).ShouldBe(reopenRan.Task,
+        (await Task.WhenAny(reopenRan.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(reopenRan.Task,
             "stream fault must trigger the supervisor's reopen path");
-        (await Task.WhenAny(replayRan.Task, Task.Delay(WaitMs))).ShouldBe(replayRan.Task,
+        (await Task.WhenAny(replayRan.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(replayRan.Task,
             "stream fault must trigger the supervisor's replay path");
 
         await supervisor.WaitForHealthyAsync(new CancellationTokenSource(WaitMs).Token);
@@ -114,7 +114,7 @@ public sealed class EventPumpStreamFaultTests
 
         await resubscribed.EmitAsync(itemHandle: 7, value: 123.0);
 
-        var completed = await Task.WhenAny(resumed.Task, Task.Delay(WaitMs));
+        var completed = await Task.WhenAny(resumed.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken));
         completed.ShouldBe(resumed.Task,
             "a fresh EventPump created after a fault must resume dispatching OnDataChange");
         (await resumed.Task).FullReference.ShouldBe("Tank.Level");

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/GalaxyDriverFixRound1Tests.cs

@@ -251,7 +251,7 @@ public sealed class GalaxyDriverFixRound1Tests
             await WaitUntilAsync(() => Volatile.Read(ref deploys.Opened) == 1, "the deploy watch must open");
             await deploys.PushAsync(1, new DateTimeOffset(2026, 1, 1, 0, 0, 0, TimeSpan.Zero)); // bootstrap
             await deploys.PushAsync(2, new DateTimeOffset(2026, 1, 2, 0, 0, 0, TimeSpan.Zero));
-            (await Task.WhenAny(platforms.Entered.Task, Task.Delay(WaitMs))).ShouldBe(platforms.Entered.Task,
+            (await Task.WhenAny(platforms.Entered.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(platforms.Entered.Task,
                 "the first rediscovery pass must be parked mid-fetch");
 
             await deploys.PushAsync(3, new DateTimeOffset(2026, 1, 3, 0, 0, 0, TimeSpan.Zero));
@@ -308,7 +308,7 @@ public sealed class GalaxyDriverFixRound1Tests
         var subscribeCallsBefore = sub.SubscribeCalls;
         try
         {
-            (await Task.WhenAny(sub.UnsubscribeEntered.Task, Task.Delay(WaitMs))).ShouldBe(sub.UnsubscribeEntered.Task,
+            (await Task.WhenAny(sub.UnsubscribeEntered.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(sub.UnsubscribeEntered.Task,
                 "the teardown must be parked inside the probe watcher's unsubscribe");
             shutdown.IsCompleted.ShouldBeFalse();
 
@@ -391,7 +391,7 @@ public sealed class GalaxyDriverFixRound1Tests
             await driver.SubscribeAsync(["Tank01.Level"], TimeSpan.Zero, CancellationToken.None);
 
             var replay = driver.InvokeReplayForTestAsync(CancellationToken.None);
-            (await Task.WhenAny(sub.SubscribeEntered.Task, Task.Delay(WaitMs))).ShouldBe(sub.SubscribeEntered.Task,
+            (await Task.WhenAny(sub.SubscribeEntered.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(sub.SubscribeEntered.Task,
                 "the replay must be parked inside its SubscribeBulk");
 
             await driver.ShutdownAsync(CancellationToken.None);

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/GalaxyDriverReadTests.cs

@@ -172,7 +172,7 @@ public sealed class GalaxyDriverReadTests
         };
 
         var readTask = driver.ReadAsync(["Silent.Tag"], CancellationToken.None);
-        var finished = await Task.WhenAny(readTask, Task.Delay(TimeSpan.FromSeconds(10)));
+        var finished = await Task.WhenAny(readTask, Task.Delay(TimeSpan.FromSeconds(10), TestContext.Current.CancellationToken));
 
         finished.ShouldBe(readTask);
         var result = await readTask;

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/GalaxyDriverShutdownTests.cs

@@ -174,14 +174,14 @@ public sealed class GalaxyDriverShutdownTests
         driver.HasEventPumpForTests.ShouldBeTrue();
 
         await sub.EmitAsync(sub.HandleByRef["Tank01.Level"], 42.0);
-        (await Task.WhenAny(delivered.Task, Task.Delay(WaitMs))).ShouldBe(delivered.Task,
+        (await Task.WhenAny(delivered.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(delivered.Task,
             "positive control: the stream must deliver before the shutdown");
 
         await driver.ShutdownAsync(CancellationToken.None);
 
         // Bounded wait, not an instantaneous IsCompleted check: the pump's dispose does not promise the
         // enumerator's cancellation registration has run by the time it returns (observed flaky).
-        (await Task.WhenAny(sub.StreamCancelled.Task, Task.Delay(WaitMs))).ShouldBe(sub.StreamCancelled.Task,
+        (await Task.WhenAny(sub.StreamCancelled.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(sub.StreamCancelled.Task,
             "ShutdownAsync must cancel the StreamEvents stream");
         driver.HasEventPumpForTests.ShouldBeFalse();
         driver.TrackedSubscriptionCountForTests.ShouldBe(0, "handles died with the session; the host re-subscribes after re-init");

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/GatewayGalaxyAlarmFeedTests.cs

@@ -53,7 +53,7 @@ public sealed class GatewayGalaxyAlarmFeedTests
         };
         feed.Start();
 
-        (await Task.WhenAny(got3.Task, Task.Delay(TimeSpan.FromSeconds(2))))
+        (await Task.WhenAny(got3.Task, Task.Delay(TimeSpan.FromSeconds(2), TestContext.Current.CancellationToken)))
             .ShouldBe(got3.Task, "snapshot + transition should dispatch within 2s");
 
         observed.Count.ShouldBe(3);
@@ -109,7 +109,7 @@ public sealed class GatewayGalaxyAlarmFeedTests
         };
         feed.Start();
 
-        (await Task.WhenAny(got2.Task, Task.Delay(TimeSpan.FromSeconds(2)))).ShouldBe(got2.Task);
+        (await Task.WhenAny(got2.Task, Task.Delay(TimeSpan.FromSeconds(2), TestContext.Current.CancellationToken))).ShouldBe(got2.Task);
 
         observed[0].TransitionKind.ShouldBe(GalaxyAlarmTransitionKind.Clear);
         observed[0].IsRestatement.ShouldBeTrue();
@@ -145,7 +145,7 @@ public sealed class GatewayGalaxyAlarmFeedTests
         };
         feed.Start();
 
-        (await Task.WhenAny(gotOne.Task, Task.Delay(TimeSpan.FromSeconds(2))))
+        (await Task.WhenAny(gotOne.Task, Task.Delay(TimeSpan.FromSeconds(2), TestContext.Current.CancellationToken)))
             .ShouldBe(gotOne.Task);
 
         // Only the well-formed Raise survives; the Unspecified + empty messages drop.
@@ -187,7 +187,7 @@ public sealed class GatewayGalaxyAlarmFeedTests
         };
         feed.Start();
 
-        (await Task.WhenAny(gotOne.Task, Task.Delay(TimeSpan.FromSeconds(3))))
+        (await Task.WhenAny(gotOne.Task, Task.Delay(TimeSpan.FromSeconds(3), TestContext.Current.CancellationToken)))
             .ShouldBe(gotOne.Task, "the feed should reopen the stream and deliver after a fault");
 
         calls.ShouldBeGreaterThanOrEqualTo(2);

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Runtime/ReconnectSupervisorCycleCtsTests.cs

@@ -47,7 +47,7 @@ public sealed class ReconnectSupervisorCycleCtsTests
         // Positive control: a cycle parked inside reopen still holds its CTS.
         Volatile.Write(ref hold[0], true);
         sup.ReportTransportFailure(new IOException("drop 3"));
-        (await Task.WhenAny(reopenEntered.Task, Task.Delay(WaitMs))).ShouldBe(reopenEntered.Task);
+        (await Task.WhenAny(reopenEntered.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(reopenEntered.Task);
         sup.CyclesStarted.ShouldBe(4);
         sup.CyclesReleased.ShouldBe(3, "an in-flight cycle's CTS is live until its loop exits");
 
@@ -71,10 +71,10 @@ public sealed class ReconnectSupervisorCycleCtsTests
             options: FastBackoff());
 
         sup.ReportTransportFailure(new IOException("drop"));
-        (await Task.WhenAny(reopenEntered.Task, Task.Delay(WaitMs))).ShouldBe(reopenEntered.Task);
+        (await Task.WhenAny(reopenEntered.Task, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(reopenEntered.Task);
 
         var stop = sup.StopAsync();
-        (await Task.WhenAny(stop, Task.Delay(WaitMs))).ShouldBe(stop, "StopAsync must cancel the parked reopen and return");
+        (await Task.WhenAny(stop, Task.Delay(WaitMs, TestContext.Current.CancellationToken))).ShouldBe(stop, "StopAsync must cancel the parked reopen and return");
         sup.CyclesReleased.ShouldBe(1);
         await Should.NotThrowAsync(sup.StopAsync); // idempotent
         Should.NotThrow(sup.Dispose);

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Historian.Gateway.Tests/ZB.MOM.WW.OtOpcUa.Driver.Historian.Gateway.Tests.csproj

@@ -13,8 +13,8 @@
         <PackageReference Include="xunit.v3"/>
         <PackageReference Include="Shouldly"/>
         <PackageReference Include="Microsoft.NET.Test.Sdk"/>
-        <!-- ServiceCollection + BuildServiceProvider for the CreateDataSource factory test. -->
-        <PackageReference Include="Microsoft.Extensions.DependencyInjection"/>
+        <!-- ServiceCollection + BuildServiceProvider (CreateDataSource factory test) come from the Microsoft.AspNetCore.App
+             FrameworkReference below, so no explicit Microsoft.Extensions.DependencyInjection package (NU1510). -->
         <!-- In-process gRPC server capturing the published client's ReadEvents request (#675 bounds pin). -->
         <PackageReference Include="Grpc.AspNetCore"/>
         <PackageReference Include="xunit.runner.visualstudio">

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Modbus.Tests/ModbusDriverProbeParityTests.cs

@@ -51,6 +51,6 @@ public sealed class ModbusDriverProbeParityTests
         var (target, error) = ModbusDriverProbe.TryParseProbeTarget(
             "not valid json {{", fallbackTimeout: TimeSpan.FromSeconds(5));
         target.ShouldBeNull();
-        error.ShouldContain("invalid");
+        error.ShouldNotBeNull().ShouldContain("invalid");
     }
 }

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Modbus.Tests/ModbusDriverProbeTests.cs

@@ -181,7 +181,7 @@ public sealed class ModbusDriverProbeTests
         var result = await _probe.ProbeAsync(Config(port), QuickTimeout, CancellationToken.None);
 
         // The server task should have completed (or close enough).
-        await serverTask.WaitAsync(TimeSpan.FromSeconds(2), TestContext.Current.CancellationToken).ConfigureAwait(false);
+        await serverTask.WaitAsync(TimeSpan.FromSeconds(2), TestContext.Current.CancellationToken);
 
         result.Ok.ShouldBeFalse();
         result.Message.ShouldNotBeNull();
@@ -211,7 +211,7 @@ public sealed class ModbusDriverProbeTests
 
         var result = await _probe.ProbeAsync(Config(port), QuickTimeout, CancellationToken.None);
 
-        await serverTask.WaitAsync(TimeSpan.FromSeconds(3), TestContext.Current.CancellationToken).ConfigureAwait(false);
+        await serverTask.WaitAsync(TimeSpan.FromSeconds(3), TestContext.Current.CancellationToken);
 
         result.Ok.ShouldBeTrue();
         result.Message.ShouldBe("Modbus FC03 OK");
@@ -241,7 +241,7 @@ public sealed class ModbusDriverProbeTests
 
         var result = await _probe.ProbeAsync(Config(port), QuickTimeout, CancellationToken.None);
 
-        await serverTask.WaitAsync(TimeSpan.FromSeconds(3), TestContext.Current.CancellationToken).ConfigureAwait(false);
+        await serverTask.WaitAsync(TimeSpan.FromSeconds(3), TestContext.Current.CancellationToken);
 
         result.Ok.ShouldBeTrue();
         result.Message.ShouldNotBeNull();

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Modbus.Tests/ModbusLifecycleHygieneTests.cs

@@ -497,8 +497,8 @@ public sealed class ModbusLifecycleHygieneTests(ITestOutputHelper output)
         });
 
         await Task.WhenAll(
-            Task.Run(() => drv.InitializeAsync("{}", CancellationToken.None)),
-            Task.Run(() => drv.InitializeAsync("{}", CancellationToken.None)));
+            Task.Run(() => drv.InitializeAsync("{}", CancellationToken.None), TestContext.Current.CancellationToken),
+            Task.Run(() => drv.InitializeAsync("{}", CancellationToken.None), TestContext.Current.CancellationToken));
 
         var built = handed.ToArray();
         built.Length.ShouldBe(2);

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Mqtt.Tests/MqttDriverDiscoveryTests.cs

@@ -276,7 +276,7 @@ public sealed class MqttDriverDiscoveryTests
         // The gate is held by the parked initialize. Dispose must still be waiting. (The gate wait is
         // bounded by ConnectTimeoutSeconds = 2 s, so this 300 ms window is comfortably inside it —
         // an ungated dispose returns essentially instantly.)
-        var raced = await Task.WhenAny(dispose, Task.Delay(TimeSpan.FromMilliseconds(300)));
+        var raced = await Task.WhenAny(dispose, Task.Delay(TimeSpan.FromMilliseconds(300), TestContext.Current.CancellationToken));
         raced.ShouldNotBe(dispose, "DisposeAsync returned while a lifecycle operation held the gate");
 
         release.SetResult();

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.Browser.Tests/OpcUaClientBrowseSessionAttributesTests.cs

@@ -20,7 +20,7 @@ public sealed class OpcUaClientBrowseSessionAttributesTests
     private static Mock<ISession> SessionReturning(NodeClass nodeClass, NodeId dataType, int valueRank, byte userAccess)
     {
         var mock = new Mock<ISession>(MockBehavior.Loose);
-        mock.SetupGet(s => s.MessageContext).Returns(new ServiceMessageContext());
+        mock.SetupGet(s => s.MessageContext).Returns(new ServiceMessageContext(BrowseTelemetry.Context));
         mock.SetupGet(s => s.NamespaceUris).Returns(new NamespaceTable());
         mock.Setup(s => s.ReadAsync(
                 It.IsAny<RequestHeader>(), It.IsAny<double>(), It.IsAny<TimestampsToReturn>(),

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.Browser.Tests/OpcUaClientBrowseSessionPaginationTests.cs

@@ -20,7 +20,7 @@ public sealed class OpcUaClientBrowseSessionPaginationTests
     private static Mock<ISession> BuildSession(bool cancelNext)
     {
         var mock = new Mock<ISession>(MockBehavior.Loose);
-        mock.SetupGet(s => s.MessageContext).Returns(new ServiceMessageContext());
+        mock.SetupGet(s => s.MessageContext).Returns(new ServiceMessageContext(BrowseTelemetry.Context));
         mock.SetupGet(s => s.NamespaceUris).Returns(new NamespaceTable());
 
         var firstRef = new ReferenceDescription

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.Browser.Tests/OpcUaClientDriverBrowserTests.cs

@@ -120,7 +120,7 @@ public sealed class OpcUaClientDriverBrowserTests
         // A loose mock answers the attribute read with no response, so nothing is known about the node.
         var mockSession = new Mock<ISession>(MockBehavior.Loose);
         mockSession.SetupGet(s => s.NamespaceUris).Returns(new NamespaceTable());
-        mockSession.SetupGet(s => s.MessageContext).Returns(new ServiceMessageContext());
+        mockSession.SetupGet(s => s.MessageContext).Returns(new ServiceMessageContext(BrowseTelemetry.Context));
         var nsMap = NamespaceMap.FromTable(new NamespaceTable());
         var sut = new OpcUaClientBrowseSession(mockSession.Object, nsMap, ObjectIds.ObjectsFolder);
 

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Sql.Tests/SqlCatalogGateDriverTests.cs

@@ -48,7 +48,7 @@ public sealed class SqlCatalogGateDriverTests
         driver.GetHealth().LastError.ShouldBeNull();
 
         // …and the one that contradicts it.
-        var report = ((ISkippedTagReporter)driver).GetSkippedTags();
+        var report = ((ISkippedTagReporter)driver).GetSkippedTags().ShouldNotBeNull();
         report.AuthoredCount.ShouldBe(2);
         report.SkippedCount.ShouldBe(1, "the gate rejected one tag; the blob mapped both");
         report.Sample.Single().RawPath.ShouldBe("Bogus");
@@ -64,7 +64,7 @@ public sealed class SqlCatalogGateDriverTests
 
         await driver.InitializeAsync(ConfigJson, CancellationToken.None);
 
-        var report = ((ISkippedTagReporter)driver).GetSkippedTags();
+        var report = ((ISkippedTagReporter)driver).GetSkippedTags().ShouldNotBeNull();
         report.AuthoredCount.ShouldBe(1);
         report.HasSkips.ShouldBeFalse();
     }

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.TwinCAT.Tests/TwinCATLowFindingsRegressionTests.cs

@@ -121,7 +121,7 @@ public sealed class TwinCATLowFindingsRegressionTests
 
     /// <summary>Verifies that Dispose does not block on async operations in the default synchronization context.</summary>
     [Fact]
-    public void Dispose_does_not_block_on_async_in_default_synchronization_context()
+    public async Task Dispose_does_not_block_on_async_in_default_synchronization_context()
     {
         // Sync-over-async on a single-threaded sync context (like the OPC UA stack thread) can
         // deadlock. Dispose() must complete without scheduling continuations through a captured
@@ -132,7 +132,7 @@ public sealed class TwinCATLowFindingsRegressionTests
             Devices = [new TwinCATDeviceOptions(DeviceA)],
             Probe = new TwinCATProbeOptions { Enabled = false },
         }, "drv-1");
-        drv.InitializeAsync("{}", CancellationToken.None).GetAwaiter().GetResult();
+        await drv.InitializeAsync("{}", CancellationToken.None);
 
         var ctx = new SingleThreadedSyncContext();
         var prev = SynchronizationContext.Current;