test(Dropdown): add unit test improve code coverage (#5323)

* refactor: update html element tag name

* test: 更新单元测试

Co-Authored-By: ice6 <[email protected]>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: 3 people

src/BootstrapBlazor/Components/Dropdown/Dropdown.razor

@@ -8,7 +8,7 @@
     <BootstrapLabel for="@Id" ShowLabelTooltip="ShowLabelTooltip" Value="@DisplayText" />
 }
 <div @attributes="@AdditionalAttributes" id="@Id" class="@DirectionClassName">
-    <DynamicElement type="button" class="@ButtonClassName" data-bs-toggle="@DropdownToggle" disabled="@Disabled"
+    <DynamicElement TagName="button" type="button" class="@ButtonClassName" data-bs-toggle="@DropdownToggle" disabled="@Disabled"
                     TriggerClick="ShowSplit" OnClick="OnClickButton">
         @if (ButtonTemplate == null)
         {

test/UnitTest/Components/DropdownTest.cs

@@ -8,13 +8,29 @@ namespace UnitTest.Components;
 public class DropdownTest : BootstrapBlazorTestBase
 {
     [Fact]
-    public void ShowSplit_OK()
+    public async Task ShowSplit_OK()
     {
+        var clicked = false;
+        var clickedWithoutRender = false;
         var cut = Context.RenderComponent<Dropdown<EnumEducation>>(pb =>
         {
             pb.Add(a => a.ShowSplit, true);
+            pb.Add(a => a.OnClick, () =>
+            {
+                clicked = true;
+            });
+            pb.Add(a => a.OnClickWithoutRender, () =>
+            {
+                clickedWithoutRender = true;
+                return Task.CompletedTask;
+            });
         });
         Assert.Contains(" dropdown-toggle-split", cut.Markup);
+
+        var button = cut.Find("button");
+        await cut.InvokeAsync(() => button.Click());
+        Assert.True(clicked);
+        Assert.True(clickedWithoutRender);
     }
 
     [Fact]