test(B05): 배수 시험 가짜 DOM 에 setAttribute — 부품 단 data-size (PLAN 553-2)

- helper_349 · helper_510 가짜 요소가 setAttribute 를 받게 함(baea63804 단추 단 표기)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

resources/tester/helper_349_drainage_live_flow.cjs

@@ -34,6 +34,9 @@ function el(tag) {
     replaceChildren(...kids) {
       this.children = kids;
     },
+    setAttribute(name, value) {
+      (this.attrs ??= {})[name] = String(value);
+    },
     addEventListener(type, fn) {
       (this.listeners[type] ??= []).push(fn);
     },

resources/tester/helper_510_propose.cjs

@@ -24,6 +24,9 @@ function el(tag) {
       node.children = [];
       node.append(...items);
     },
+    setAttribute(name, value) {
+      (this.attrs ??= {})[name] = String(value);
+    },
     addEventListener(type, fn) {
       (listeners[type] ??= []).push(fn);
     },