diff --git a/src/__tests__/01.js b/src/__tests__/01.js
index 57461f9d..895654f5 100644
--- a/src/__tests__/01.js
+++ b/src/__tests__/01.js
@@ -26,7 +26,7 @@ test('clicking the button increments the count with useReducer', () => {
 alfredTip(() => {
 const commentLessLines = Counter.toString()
 .split('\n')
- .filter(l => !l.includes('//'))
+ .filter(l => !l.trim().substr(0, 2).includes('//'))
 .join('\n')
 expect(commentLessLines).toMatch('useReducer(')
 expect(commentLessLines).not.toMatch('useState(')
</div><div class="naked_ctrl">
<form action="/index.cgi/larger-text" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://patch-diff.githubusercontent.com/raw/epicweb-dev/advanced-react-apis/pull/139.diff">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://patch-diff.githubusercontent.com/raw/epicweb-dev/advanced-react-apis/pull/139.diff" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast">配色反転</option>
<option value="larger-text" selected="selected">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>