[wp-trac] [WordPress Trac] #61371: Improve `class WP_Theme_JSON` tests

[WordPress Trac]

#61371: Improve `class WP_Theme_JSON` tests
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 Reporter:  isabel_brison  |      Owner:  (none)
     Type:  enhancement    |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Editor         |    Version:  trunk
 Severity:  normal         |   Keywords:
  Focuses:                 |
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 Currently, any change made to styles generated by class `WP_Theme_JSON`
 cause multiple tests from its test suite to fail, mostly due to diffs in
 CSS strings being checked for equality.

 These tests haven't proven very useful to detect bugs in the class, but
 they have been incredibly painful to maintain due to the constant updates
 of test strings needed every time a change is made to the output styles.

 There's more context in
 https://github.com/WordPress/gutenberg/issues/60842.

 It would be good to at the very least test the output of the functions
 called by `get_stylesheet` separately. Ideally we'd minimise comparing
 full CSS strings, because they change quite often.

 Further ideas for improvement welcome! I'm thinking to work on this core-
 first in hopes the changes can still make it into 6.6 and be of benefit
 during this cycle.

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Ticket URL: <https://core.trac.wordpress.org/ticket/61371>
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