Remove unnecessary code, maintain a consistent code style

[waahhh]

Motivation

• Unnecessary test code and inconsistent code style

Modifications

• Remove unnecessary test stubbing code
• Write with a consistent code style

Commit Convention Rule

• Please commit your modification based by conventional commit:

Commit type	Description
feat	New Feature
fix	Fix bug
docs	Documentation only changed
ci	Change CI configuration
refactor	Not a bug fix or add feature, just refactoring code
test	Add Test case or fix wrong test case
style	Only change the code style(ex. white-space, formatting)
chore	It refers to minor tasks such as library version upgrade, typo correction, etc.

• If you want to add some more commit type please describe it on the Pull Request

Result

• Maintain a consistent code style

Closes

• #{issue number} (If this PR resolves an issue.)

[shouwn]

Wow thanks so much for styling codes!