By: Tom Sydney Kerckhove <syd@cs-syd.eu>
Resolve scenario files against the scenario directory sydtest's typed scenarioDir hands the callback a path relative to the scenario directory, where the old FilePath version handed one relative to the working directory. Taking it as-is looked for test_resources/foo.html at foo.html, so all 19 goldens went missing and the suite failed with "Golden output not found" rather than with a diff. Joining the directory back on also restores the test descriptions to the paths they named before, since the description is where the missing prefix showed.