test: Update 'validates url is valid' test

[trillium]

Fixes #49

What:

Switches validates url is valid test to use a regex that passes for changed new URL() error message from node 15 to node 16

Why:

Test suite fails when asked to rerun all tests

How:

Pass a regex that will match the error message Invalid URL (error message node 16+) and Invalid URL: blah (error message node 15-) into the tests toThrow().

Checklist:

• Documentation N/A
• Tests
• Ready to be merged