test: fix improper path to URL conversion
Some tests are failing when I run them from a directory whose path contains URL-significant chars (e.g. ?, #, %). We should be using pathToFileURL, so that's what this PR is doing.
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Some tests are failing when I run them from a directory whose path contains URL-significant chars (e.g. ?, #, %). We should be using pathToFileURL, so that's what this PR is doing.