feat(ui): add ExpandAll, CollapseAll, RevealNode to TreeView (R12, R13)

tests/ScadaLink.CentralUI.Tests/TreeViewTests.cs

@@ -383,4 +383,77 @@ public class TreeViewTests : BunitContext
         var labels = cut.FindAll(".node-label");
         Assert.DoesNotContain(labels, l => l.TextContent == "Alpha-1");
     }
+
+    [Fact]
+    public void ExpandAll_ExpandsAllBranches()
+    {
+        var cut = RenderTreeView();
+
+        // Everything collapsed initially
+        Assert.Equal(2, cut.FindAll(".node-label").Count);
+
+        cut.InvokeAsync(() => cut.Instance.ExpandAll());
+
+        var labels = cut.FindAll(".node-label");
+        Assert.Contains(labels, l => l.TextContent == "Alpha-1");
+        Assert.Contains(labels, l => l.TextContent == "Alpha-2");
+        Assert.Contains(labels, l => l.TextContent == "Alpha-2-X");
+    }
+
+    [Fact]
+    public void CollapseAll_CollapsesAllBranches()
+    {
+        var cut = RenderTreeView(initiallyExpanded: _ => true);
+
+        // Verify deep content is visible
+        var labels = cut.FindAll(".node-label");
+        Assert.Contains(labels, l => l.TextContent == "Alpha-2-X");
+
+        cut.InvokeAsync(() => cut.Instance.CollapseAll());
+
+        // Only roots should be visible
+        labels = cut.FindAll(".node-label");
+        Assert.Equal(2, labels.Count);
+        Assert.DoesNotContain(labels, l => l.TextContent == "Alpha-1");
+    }
+
+    [Fact]
+    public void RevealNode_ExpandsAncestors()
+    {
+        var cut = RenderTreeView();
+
+        // Everything collapsed initially
+        Assert.Equal(2, cut.FindAll(".node-label").Count);
+
+        cut.InvokeAsync(() => cut.Instance.RevealNode("a2x"));
+
+        // Alpha-2-X should now be visible (Alpha and Alpha-2 expanded)
+        var labels = cut.FindAll(".node-label");
+        Assert.Contains(labels, l => l.TextContent == "Alpha-2-X");
+        Assert.Contains(labels, l => l.TextContent == "Alpha-1"); // sibling also visible since Alpha is expanded
+        Assert.Contains(labels, l => l.TextContent == "Alpha-2");
+    }
+
+    [Fact]
+    public void RevealNode_WithSelect_SelectsNode()
+    {
+        object? selected = null;
+        var cut = RenderTreeView(selectable: true, onSelectedKeyChanged: k => selected = k);
+
+        cut.InvokeAsync(() => cut.Instance.RevealNode("a2x", select: true));
+
+        Assert.Equal("a2x", selected);
+    }
+
+    [Fact]
+    public void RevealNode_UnknownKey_NoOp()
+    {
+        var cut = RenderTreeView();
+
+        cut.InvokeAsync(() => cut.Instance.RevealNode("nonexistent"));
+
+        // Alpha should still be collapsed
+        var labels = cut.FindAll(".node-label");
+        Assert.Equal(2, labels.Count);
+    }
 }