test(central-ui): cover tree-select path for OnNodeSelected DataType

tests/ZB.MOM.WW.ScadaBridge.CentralUI.Tests/Components/NodeBrowserDialogSelectionTests.cs

@@ -66,4 +66,36 @@ public class NodeBrowserDialogSelectionTests : BunitContext
 
         Assert.Empty(cut.FindAll("[data-test=node-search-input]"));
     }
+
+    // The Secured Writes page browses MxGateway with ShowSearch=false, so the
+    // ONLY user-reachable selection path in production is the tree (Select(TreeNode)
+    // → _selectedNode = node.Source). This guards that path end-to-end: a tree-node
+    // click must carry the node's DataType through Confirm → OnNodeSelected.
+    [Fact]
+    public void TreeSelect_emits_full_node_with_datatype_on_OnNodeSelected()
+    {
+        _browse.BrowseChildrenAsync(
+                Arg.Any<string>(), Arg.Any<string>(), Arg.Any<string?>(),
+                Arg.Any<string?>(), Arg.Any<CancellationToken>())
+            .Returns(new BrowseNodeResult(
+                new[] { new BrowseNode("Area1.Pump.Speed", "Speed", BrowseNodeClass.Variable, HasChildren: false, DataType: "Float") },
+                Truncated: false, Failure: null));
+
+        BrowseNode? captured = null;
+        var cut = Render<NodeBrowserDialog>(p => p
+            .Add(c => c.SiteId, "plant-a")
+            .Add(c => c.ConnectionName, "PLC-MX")
+            .Add(c => c.ShowSearch, false)
+            .Add(c => c.OnNodeSelected, EventCallback.Factory.Create<BrowseNode>(this, n => captured = n)));
+        cut.InvokeAsync(() => cut.Instance.ShowAsync("plant-a", "PLC-MX", null));
+        cut.Render();
+
+        // Click the tree node's select link (tree path, not search).
+        cut.Find(".node-browser-tree a").Click();
+        cut.Find(".modal-footer .btn-primary").Click();
+
+        Assert.NotNull(captured);
+        Assert.Equal("Area1.Pump.Speed", captured!.NodeId);
+        Assert.Equal("Float", captured.DataType);
+    }
 }