Test Code Cleanup

[jkosternl]

Cleaned:

1. unnecessary public modifiers on unit tests
2. unnecessary throws declarations
3. unnecessary imports
4. Javadoc section breaks
5. add final modifier on final fields
6. Output formatting at once
7. unnecessary empty strings

Hope you like it 👍🏻

[stevehu]

@jkosternl Thanks a lot for your help.