feat(dcl): implement IBrowsableDataConnection on OpcUaDataConnection

src/ZB.MOM.WW.ScadaBridge.DataConnectionLayer/Adapters/OpcUaDataConnection.cs

@@ -17,7 +17,7 @@ namespace ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Adapters;
 /// - Read/Write → Read/Write service calls
 /// - Quality → OPC UA StatusCode mapping
 /// </summary>
-public class OpcUaDataConnection : IDataConnection
+public class OpcUaDataConnection : IDataConnection, IBrowsableDataConnection
 {
     private readonly IOpcUaClientFactory _clientFactory;
     private readonly ILogger<OpcUaDataConnection> _logger;
@@ -274,6 +274,12 @@ public class OpcUaDataConnection : IDataConnection
         return results;
     }
 
+    /// <inheritdoc />
+    public Task<BrowseChildrenResult> BrowseChildrenAsync(
+        string? parentNodeId,
+        CancellationToken cancellationToken = default)
+        => _client!.BrowseChildrenAsync(parentNodeId, cancellationToken);
+
     /// <inheritdoc />
     public async Task<bool> WriteBatchAndWaitAsync(
         IDictionary<string, object?> values, string flagPath, object? flagValue,

tests/ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Tests/Adapters/OpcUaDataConnectionBrowseTests.cs

@@ -0,0 +1,41 @@
+using Microsoft.Extensions.Logging.Abstractions;
+using NSubstitute;
+using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Protocol;
+using ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Adapters;
+
+namespace ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Tests.Adapters;
+
+/// <summary>
+/// Task 9 (opcua-tag-browser): <see cref="OpcUaDataConnection"/> implements
+/// <see cref="IBrowsableDataConnection"/> as a one-line forwarder onto the
+/// underlying <see cref="IOpcUaClient"/>. This guards that wiring — the
+/// adapter must not add its own browse semantics; all browse behaviour lives
+/// in the client (and is covered by RealOpcUaClient's own tests).
+/// </summary>
+public class OpcUaDataConnectionBrowseTests
+{
+    [Fact]
+    public async Task BrowseChildrenAsync_ForwardsToUnderlyingClient()
+    {
+        var client = Substitute.For<IOpcUaClient>();
+        var factory = Substitute.For<IOpcUaClientFactory>();
+        factory.Create().Returns(client);
+        client.IsConnected.Returns(true);
+
+        var expected = new BrowseChildrenResult(
+            new[] { new BrowseNode("ns=2;s=X", "X", BrowseNodeClass.Variable, false) },
+            Truncated: false);
+        client.BrowseChildrenAsync("ns=2;s=Parent", Arg.Any<CancellationToken>())
+            .Returns(expected);
+
+        var adapter = new OpcUaDataConnection(factory, NullLogger<OpcUaDataConnection>.Instance);
+        // ConnectAsync installs the IOpcUaClient instance on the adapter; the
+        // forwarder dereferences that field directly.
+        await adapter.ConnectAsync(new Dictionary<string, string>());
+
+        var actual = await adapter.BrowseChildrenAsync("ns=2;s=Parent");
+
+        Assert.Same(expected, actual);
+        await client.Received(1).BrowseChildrenAsync("ns=2;s=Parent", Arg.Any<CancellationToken>());
+    }
+}