test: 增加单元测试

Author: ArgoZhang

test/UnitTest/Components/DrawerTest.cs

@@ -161,6 +161,16 @@ public void Position_Ok()
         cut.Contains("--bb-drawer-position: absolute;");
     }
 
+    [Fact]
+    public void ZIndex_Ok()
+    {
+        var cut = Context.RenderComponent<Drawer>(builder =>
+        {
+            builder.Add(a => a.ZIndex, 1055);
+        });
+        cut.Contains("--bb-drawer-zindex: 1055;");
+    }
+
     [Fact]
     public void IsKeyboard_Ok()
     {