[wp-trac] [WordPress Trac] #60294: Block custom CSS: Backport updates to PHPUnit tests

[WordPress Trac]

#60294: Block custom CSS: Backport updates to PHPUnit tests
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 Reporter:  wildworks     |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Backports changes to PHPUnit test made in the Gutenberg plugin with:
 https://github.com/WordPress/gutenberg/pull/53602

 In #59499, the fix itself was backported to the core. But it lacked a
 backport of PHPUnit tests to guarantee its fix.

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Ticket URL: <https://core.trac.wordpress.org/ticket/60294>
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