[wp-trac] [WordPress Trac] #33501: Starting w/ WP4.2, upgrade scenario may fail for non-MySQL installs

[WordPress Trac]

#33501: Starting w/ WP4.2, upgrade scenario may fail for non-MySQL installs
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 Reporter:  RSkoon        |       Owner:  pento
     Type:  defect (bug)  |      Status:  assigned
 Priority:  normal        |   Milestone:  4.4
Component:  Database      |     Version:  4.1.2
 Severity:  normal        |  Resolution:
 Keywords:  needs-patch   |     Focuses:
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Comment (by pento):

 Hey @RSkoon, you're totally welcome to write a patch!

 For the `wp-db.php` part of the patch, just change the `false ===
 $this->is_mysql` tests to `empty( $wpdb->is_mysql )`.

 I think it'd be good to have some unit tests for this, too. If you're up
 for writing some, check out `tests/phpunit/tests/db.php` as a place to add
 them, I'd go with faking the DB drop-in behaviour by changing the value of
 `$is_mysql` in the test.

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Ticket URL: <https://core.trac.wordpress.org/ticket/33501#comment:20>
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