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In the `set_up()` method, a copy would be made of the original value of the global `$wp_theme_directories` variable, with the intention to restore that original value in the `tear_down()` method after running each test. Unfortunately, this was not implemented correctly. * The backup is made to a function local variable in `set_up()` and not stored somewhere where it is accessible from the `tear_down()` method. * The restoring then references a non-existent property to restore, which would effectively set the `$wp_theme_directories` global to `null`. Fixed by declaring and using a private property to store the original `$wp_theme_directories` value. This bug was discovered while fixing (removing) the magic methods in the `WP_UnitTestCase_Base` class in an effort to improve compatibility with PHP 8.2. Follow-up to [38907]. Props jrf, costdev, johnbillion, swissspidy. See #55652. git-svn-id: https://develop.svn.wordpress.org/trunk@54040 602fd350-edb4-49c9-b593-d223f7449a82