* refactor(tests): Have testSetup accept a URL
Have testSetup accept a URL. Make testFileLocations a dictionary
whose values are URLs, and change the spellings of the keys to
be CONSTANT_CASE.
This allows tests to specify their own URL, or to add a query or
fragment.
* feat(tests): Add getAllBlocks helper
* test: Verify drag blocks works properly
* chore(tests): Reformat comments
Manually reformat comments to comply with styleguide.