Check that mocks were called

[mjoyce91]

These types of tests have always helped with code coverage, but don't give us insight into whether the mock requests were actually called. This is a way we could do that somewhat easily. Looking for feedback.

[burgwyn]

Before

=============================== Coverage summary ===============================
Statements   : 96.09% ( 7710/8024 )
Branches     : 82.74% ( 3303/3992 )
Functions    : 94.66% ( 2413/2549 )
Lines        : 96.32% ( 7361/7642 )
================================================================================

Test Suites: 458 passed, 458 total
Tests:       5 skipped, 2092 passed, 2097 total
Snapshots:   412 passed, 412 total
Time:        165.886s
Ran all test suites.
✨  Done in 167.42s.

After

=============================== Coverage summary ===============================
Statements   : 96.04% ( 7717/8035 )
Branches     : 82.68% ( 3307/4000 )
Functions    : 94.56% ( 2417/2556 )
Lines        : 96.27% ( 7366/7651 )
================================================================================

Test Suites: 458 passed, 458 total
Tests:       5 skipped, 2092 passed, 2097 total
Snapshots:   412 passed, 412 total
Time:        169.7s
Ran all test suites.
✨  Done in 173.11s.

[mjoyce91]

@burgwyn probably has to do with coverage on the testUtilities file. This PR is less about coverage and more about writing good tests.

[rtirserio]

👍