test(backend): jestを治す（#10516 と 5cac151 を取り込む）

[Nanashia]

What

• test(backend): ユーザーが絡むAPIのテスト追加 #10546 で入れたテストのうち feat: 自分用メモ機能 #10516 とすれ違いで取り込めていない部分を追加
• feat: 自分用メモ機能 #10516 で入れたテストが 5cac151 で期待値が変わってfailしていたため修正

Why

• jestがfailしているので。

Additional info (optional)

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Update CHANGELOG.md
• (If possible) Add tests

[codecov]

Codecov Report

Merging #10624 (08cc617) into develop (2423fb8) will decrease coverage by 2.27%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop   #10624      +/-   ##
===========================================
- Coverage    78.33%   76.07%   -2.27%     
===========================================
  Files          164      896     +732     
  Lines        20447    88490   +68043     
  Branches       363     6250    +5887     
===========================================
+ Hits         16018    67315   +51297     
- Misses        4429    21175   +16746     

see 734 files with indirect coverage changes

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[tamaina]

👍👍👍