[wp-trac] [WordPress Trac] #34941: Make the main bootstrap process in ms-settings.php testable

[WordPress Trac]

#34941: Make the main bootstrap process in ms-settings.php testable
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 Reporter:  jeremyfelt      |      Owner:
     Type:  enhancement     |     Status:  new
 Priority:  normal          |  Milestone:  4.5
Component:  Bootstrap/Load  |    Version:
 Severity:  normal          |   Keywords:  has-patch
  Focuses:  multisite       |
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 One of the harder things to test right now in multisite is the bootstrap
 behavior. We have a hobbled together process right now that sets up a new
 "request" and re-includes `ms-settings.php` before checking the status of
 `$current_blog` and `$current_site`. This works for many configurations,
 but isn't useful when catching a failed scenario that results in a
 redirect or `ms_not_installed()`.

 We can pull most of this code out into a new function, `ms_bootstrap()` or
 similar, that handles the domain and path and returns the possible
 actions. From my first pass, I've landed on `true` for when a site and
 network are found, `false` for when a site or network is not found, and
 `URL string` for when a request needs to be immediately redirected
 elsewhere.

 I'm attaching an initial patch to start work on this. Once a version of it
 is in, we'll be able to better test a ticket like #17376.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34941>
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