test: 增加单元测试

Author: ArgoZhang

test/UnitTest/Components/SelectTest.cs

@@ -428,6 +428,17 @@ public void Color_Ok()
         Assert.Contains("border-danger", cut.Markup);
     }
 
+    [Fact]
+    public async Task OnCollapsed_Ok()
+    {
+        var collapsed = false;
+        var cut = Context.RenderComponent<Select<string>>(pb =>
+        {
+            pb.Add(a => a.OnCollapsed, () => { collapsed = true; return Task.CompletedTask; });
+        });
+        await cut.InvokeAsync(() => cut.Instance.TriggerCollapsed());
+        Assert.True(collapsed);
+    }
     [Fact]
     public void Validate_Ok()
     {