Adding destroy function to aid in unit testing

Added `destroy` function

Status: **Ready to merge**

Reviewers: @kpeatt @tedtate 
JIRA: https://mobify.atlassian.net/browse/CSOPS-949

## Changes
- added `destroy` function
- updated tests with `destroy` function

## How to test-drive this PR
- checkout this branch
- `grunt test`
- trust in @scalvert that he's done things right