Unit test functionality used for WAFv2 controller (#543)

Issue #, if available:

Description of changes:
New unit tests cover code-gen bugfixes and improvements, pre-requisites for WAFv2 controller:
- #539
- #538
- #536

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: TiberiuGC