[wp-trac] [WordPress Trac] #61240: Add e2e test for maintenance mode and other edge cases

[WordPress Trac]

#61240: Add e2e test for maintenance mode and other edge cases
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 Reporter:  swissspidy        |      Owner:  (none)
     Type:  enhancement       |     Status:  assigned
 Priority:  normal            |  Milestone:  6.6
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:  needs-patch
  Focuses:                    |
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 In https://core.trac.wordpress.org/ticket/61182#comment:9 I just reported
 a fatal error that is hard to discover in regular development, as it only
 happens in maintenance mode.

 Maintenance mode also loads translations using
 `wp_load_translations_early()`, which is also tricky to test and had some
 bugs in the past too.

 Similar situations exist in the fatal error handler class, or in wpdb when
 there is a connection issue.

 It should be possible to write e2e tests for such scenarios, for example
 by placing a `.maintenance` file in the root or by temporarily changing
 the database credentials and things like that.

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Ticket URL: <https://core.trac.wordpress.org/ticket/61240>
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