[wp-trac] [WordPress Trac] #36567: Allow overriding constants in testing framework

[WordPress Trac]

#36567: Allow overriding constants in testing framework
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 Reporter:  rmccue            |      Owner:
     Type:  enhancement       |     Status:  new
 Priority:  normal            |  Milestone:  4.6
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 `bootstrap.php` in our testing harness sets some constants, and it's
 impossible to override these (without warnings, at least). In particular,
 you can define `WP_TESTS_MULTISITE` to set multisite, but you can't set
 `SUBDOMAIN_INSTALL`. This makes it impossible to test sites which need
 multisite, or to test plugins which do subdomain-specific things (such as
 domain mapping and aliasing).

 These should only be defined if not already, rather than forcing them.

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Ticket URL: <https://core.trac.wordpress.org/ticket/36567>
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