Unit Testing for Grant Permission Router

[jng34]

Fixes #1889

What changes did you make and why did you make them ?

• create unit testing for grantpermission.router.js
• necessary to ensure that the grantpermission.router is functioning properly

[bconti123]

This unit test looks good to me. I reviewed each pass/fail case and read through the related functions to understand what the tests were covering.

I ran coverage and noticed the uncovered lines in grantpermission.router.js. My current assumption is that several of these lines may be better suited for future integration testing.

I ran this command:

npm test -- --coverage --runTestsByPath routers/grantpermission.router.test.js

Uncovered lines noted:
Line 57
Line 64
Line 151
Line 161-166
Line 189
Line 194
Line 230-268
Line 344

I approved this PR and am leaving these uncovered lines as a note for possible follow-up integration coverage.