[wp-trac] [WordPress Trac] #53997: Add some unit tests for the WP_Upgrader class

[WordPress Trac]

#53997: Add some unit tests for the WP_Upgrader class
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 Reporter:  SergeyBiryukov            |       Owner:  (none)
     Type:  task (blessed)            |      Status:  new
 Priority:  normal                    |   Milestone:  6.0
Component:  Upgrade/Install           |     Version:
 Severity:  normal                    |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:
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Comment (by costdev):

 [https://github.com/WordPress/wordpress-develop/pull/1751 PR 1751] on
 #54245 uses `getMockBuilder()`.

 [https://github.com/WordPress/wordpress-develop/pull/2463 PR 2463] above
 uses `WP_Upgrader` directly and aims to achieve 100% (or as near as
 possible) line/branch coverage for `WP_Upgrader`.

 #54245 notes that there is accidental coverage of `WP_Upgrader` elsewhere
 in the test suite, though a single test class that covers each line/branch
 and in doing so, demonstrates how to hit each line/branch for future path
 coverage improvements, would be ideal IMO.

 It would be good to get some input on the preferred approach for Core.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53997#comment:4>
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