test: 增加单元测试

Author: ArgoZhang

test/UnitTest/Components/TreeViewTest.cs

@@ -150,6 +150,23 @@ public async Task Items_SetActive()
         await cut.InvokeAsync(() => cut.Instance.SetActiveItem(activeItem));
     }
 
+    [Fact]
+    public void AppendNode_Ok()
+    {
+        var items = TreeFoo.GetAccordionItems();
+        var cut = Context.RenderComponent<TreeView<TreeFoo>>(pb =>
+        {
+            pb.Add(a => a.Items, items);
+        });
+        var contents = cut.FindAll(".tree-content");
+        Assert.Equal(2, contents.Count);
+
+        items.Add(new TreeViewItem<TreeFoo>(new TreeFoo()) { Text = "append-text" });
+        cut.SetParametersAndRender();
+        contents = cut.FindAll(".tree-content");
+        Assert.Equal(3, contents.Count);
+    }
+
     [Fact]
     public async Task OnClick_Checkbox_Ok()
     {