feat: implement TestMenuConfig

Extras/TestMenuConfig/MU3.TestMode/patch_TestModePageTop.cs

@@ -0,0 +1,40 @@
+using System.Linq;
+using System.Reflection;
+using UnityEngine;
+
+namespace MU3.TestMode;
+
+internal class patch_TestModePageTop: TestModePageTop {
+    GameObject _testModePageModConfig;
+
+    protected override void createItems() {
+        _bottomMargin = 0.22f;
+
+        _testModePageModConfig = new("TestModePageModConfig");
+        _testModePageModConfig.SetActive(false);
+        _testModePageModConfig.transform.SetParent(transform.parent);
+        _testModePageModConfig.AddComponent<Mod.TestModePageModConfig>();
+
+        FieldInfo fi = typeof(TestModePage).GetField("_itemDefines", BindingFlags.Instance | BindingFlags.NonPublic);
+        var defines = ((ItemDefine[])fi.GetValue(this)).ToList();
+
+        var n = defines.Count;
+        defines.Insert(n - 1, new() {
+            lineNumber = n - 1,
+            label = "MODS",
+            isSelectable = true,
+            hasValueField = false,
+            numValueField = 0,
+            nextPagePrefab = _testModePageModConfig,
+            isFinishOnSelect = false,
+            isDefaultSelection = false,
+        });
+
+        // The exit button
+        defines.Last().lineNumber += 1;
+
+        fi.SetValue(this, defines.ToArray());
+
+        base.createItems();
+    }
+}