Replace deprecated unittest method aliases
|Reported by:||Ryan J Ollos||Owned by:||Ryan J Ollos|
Replaced deprecated unit test method aliases, and refactored unit tests to utilize new methods in
Several unittest method aliases are deprecated since Python 2.7. Although it is not necessary to make the changes now, it seems like a good step toward making the codebase more readable, and better to make all the changes at once.