[wp-trac] [WordPress Trac] #57774: Add some initial PHPUnit tests for `WP_Filesystem_Direct`

[WordPress Trac]

#57774: Add some initial PHPUnit tests for `WP_Filesystem_Direct`
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 Reporter:  costdev         |      Owner:  costdev
     Type:  defect (bug)    |     Status:  assigned
 Priority:  normal          |  Milestone:  6.2
Component:  Filesystem API  |    Version:  2.5
 Severity:  normal          |   Keywords:  has-patch
  Focuses:                  |
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 This is a tests-only ticket.

 `WP_Filesystem_Direct` is, by far, the most used filesystem abstraction
 class.

 While some PHPUnit tests exist for a `WP_Filesystem_MockFS` class, this
 ticket aims to add PHPUnit tests for the `WP_Filesystem_Direct` class
 itself.

 The other filesystem abstraction classes, `WP_Filesystem_FTPext`,
 `WP_Filesystem_ftpsockets` and `WP_Filesystem_SSH2`, do not have PHPUnit
 test runner configurations. While in future, we may reuse many of the same
 tests across filesystem abstraction classes, this ticket specifically
 targets `WP_Filesystem_Direct`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57774>
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