[typescript-migration] some tests

[yuki0410-dev]

Description

Linked issue: #4700

Changes

• migrate fix src/test/calendar_test.test.tsx

Contribution checklist

• [x] I have followed the contributing guidelines.
• [x] I have added sufficient test coverage for my changes.
• [x] I have formatted my code with Prettier and checked for linting issues with ESLint for code readability.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 73.68421% with 10 lines in your changes missing coverage. Please review.

Project coverage is 96.64%. Comparing base (3ca1a7a) to head (8ae1cf0). Report is 10 commits behind head on main.

Files	Patch %	Lines
src/calendar.tsx	65.00%	7 Missing :warning:
src/popper_component.tsx	50.00%	1 Missing :warning:
src/week.tsx	75.00%	1 Missing :warning:
src/week_number.tsx	80.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4888 +/- ## ========================================== - Coverage 96.94% 96.64% -0.30% ========================================== Files 28 28 Lines 3242 3251 +9 Branches 1344 1357 +13 ========================================== - Hits 3143 3142 -1 - Misses 95 105 +10 Partials 4 4 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.