When I try to install SimpleTest via Extend > Testing > Install, I get the following error:

The testing framework requires the sites/simpletest directory to exist and be writable in order to run tests. (Currently using Simpletest site directory version Missing)

I have run $ sudo chmod -R 777 sites/simpletest in an attempt at mediating this issue, but to no avail.

I am running Drupal 8.3.5 on Fedora 25.

Thank you.

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