Reapply "test: 更新单元测试"

This reverts commit 370c624.

Author: ArgoZhang

test/UnitTest/Components/TableTest.cs

@@ -2104,6 +2104,7 @@ public void IsFixedFooter_Ok()
                 pb.Add(a => a.RenderMode, TableRenderMode.Table);
                 pb.Add(a => a.ScrollMode, ScrollMode.Virtual);
                 pb.Add(a => a.RowHeight, 39.5f);
+                pb.Add(a => a.OverscanCount, 10);
                 pb.Add(a => a.ShowFooter, true);
                 pb.Add(a => a.IsFixedFooter, true);
                 pb.Add(a => a.Items, Foo.GenerateFoo(localizer));