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[34718] introduced a 'db_version' check to term meta functions, to ensure that they don't run when the term meta schema is not yet in place. This call to `get_option()` causes a database hit during Multisite tests, due to the presence of the `WP_INSTALLING` constant. See #31130. The extra database queries are causing cache tests to fail. In similar cases, we have `markTestSkipped()` when `is_multisite()`. Because the term meta API is so extensive - term meta caches can be primed anywhere a `WP_Query` loop is fired up - we implement a more generous workaround in this case. To prevent `get_option( 'db_version' )` from hitting the database during multisite unit tests, we use a 'pre_option_' filter. Heaven help us. See #34091. git-svn-id: https://develop.svn.wordpress.org/trunk@34719 602fd350-edb4-49c9-b593-d223f7449a82