Subissue of #1787218: Convert testing variables to state system..
Change the variables file_test_hook_file_url_alter, file_test_results, file_test_return to the state system.
#1: 1843486-file_test_to_state-drupal8-1.patch queued for re-testing.
If green rtbc!
Committed and pushed to 8.x. Thanks!
Automatically closed -- issue fixed for 2 weeks with no activity.
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