Node 10 throws `TypeError [ERR_AMBIGUOUS_ARGUMENT]:`

[toddobryan-clever]

Changed two tests to explicitly check message in error thrown.

Jira:

Overview:

Screenshots/GIFs:

Testing:

• [X] Unit tests
• Manual tests: No change to actual code.
  • [ ] Chrome
  • [ ] Safari
  • [ ] IE10

Roll Out:

• Before merging:
  • [ ] Updated docs
  • [ ] Bumped version in package.json
    • Breaking change? Run npm version minor
    • Backward compatible change? Run npm version patch
    • Only changing documentation? All good. Skip this step.
• After merging:
  • [ ] Deployed updated docs (make deploy-docs)