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d0fc6ddc71
In various unit test factory classes, some of the `create_object()` and `update_object()` methods returned a `WP_Error` object on failure, while a few others were documented to do so, but did not in practice, instead returning the value `0` or `false`, or not accounting for a failure at all. This commit aims to handle this in a consistent way by updating the methods to always return the object ID on success and a `WP_Error` object on failure. Includes: * Updating and correcting the relevant documentation parts. * Adding missing documentation and `@since` tags in some classes. * Renaming some variables to clarify that it is the object ID which is passed around, not the object itself. Follow-up to [760/tests], [838/tests], [922/tests], [948/tests], [985/tests], [27178], [32659], [34855], [37563], [40968], [44497], [46262]. See #56793. git-svn-id: https://develop.svn.wordpress.org/trunk@55019 602fd350-edb4-49c9-b593-d223f7449a82