diff --git a/builtins/en/piece-categories.yaml b/builtins/en/piece-categories.yaml
index ad5a5bc..69719ce 100644
--- a/builtins/en/piece-categories.yaml
+++ b/builtins/en/piece-categories.yaml
@@ -10,6 +10,8 @@ piece_categories:
     pieces:
       - review-fix-minimal
       - review-only
+  🧪 Testing:
+    pieces:
       - unit-test
       - e2e-test
   🎨 Frontend: {}
diff --git a/builtins/ja/piece-categories.yaml b/builtins/ja/piece-categories.yaml
index 28721f6..41ca3e2 100644
--- a/builtins/ja/piece-categories.yaml
+++ b/builtins/ja/piece-categories.yaml
@@ -10,6 +10,8 @@ piece_categories:
     pieces:
       - review-fix-minimal
       - review-only
+  🧪 テスト:
+    pieces:
       - unit-test
       - e2e-test
   🎨 フロントエンド: {}