[Feature Request]: Update unit test coverage to be at min 80% coverage

[donyunardi]

Feature description

Please make sure unit tests coverage is 80% or more.

Code of Conduct

• I agree to follow this project's Code of Conduct.

Contribution Guidelines

• I agree to follow this project's Contribution Guidelines.

Security Policy

• I agree to follow this project's Security Policy.

[donyunardi]

15 modules (8 hours, 20 for the 3 complex one)

Acceptance Criteria

• Use shinytest2
• testServer