fix: the test parts set value to new Date() when there is no prop

[oh3vci]

Description

I thought I fixed all of the new Date operator related DatePicker test issue. #340
However, there are some parts of set value to new Date when there is no prop.
So, I modified them.

Related Issues

#337

Tests

jest

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• Run yarn test or yarn test -u if you need to update snapshot.
• Run yarn lint
• I am willing to follow-up on review comments in a timely manner.

[codecov]

Codecov Report

Merging #347 into master will decrease coverage by 0.16%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #347      +/-   ##
==========================================
- Coverage   83.44%   83.27%   -0.17%     
==========================================
  Files          37       37              
  Lines        1220     1220              
  Branches      369      369              
==========================================
- Hits         1018     1016       -2     
  Misses         88       88              
- Partials      114      116       +2     

[JeffGuKang]

I am not sure this PR can cover toLocaleString issue. It can be run differently on each OS locale without mocking.

[oh3vci]

I am not sure this PR can cover toLocaleString issue. It can be run differently on each OS locale without mocking.

What is the toLocaleString of /test/jestSetup.ts? I think it is for this situation.
Is it not worked? @hyochan

[oh3vci]

I thought it was necessary to add a locale prop to solve the locale problem.

[JeffGuKang]

@oh3vci
There is some problems to mock Date on React Native environment. I guess it is related to Babel but not sure.
Anyway, it will be good to exclude snapshots from the Datepicker test.
hyochan/dooboo-ui#337 (comment)

Checking rendering and branches with props is enough without mocking Date.

[oh3vci]

I rebased it.