[wp-trac] [WordPress Trac] #60387: Backport theme.json tests from Gutenberg

[WordPress Trac]

#60387: Backport theme.json tests from Gutenberg
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 Reporter:  ajlende      |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Themes       |    Version:  trunk
 Severity:  normal       |   Keywords:
  Focuses:               |
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 Paired with https://github.com/WordPress/gutenberg/pull/58476.

 Merges the changes from Core and Gutenberg for the following tests:
 1. wpThemeJson.php
 2. wpThemeJsonResolver.php
 3. wpThemeJsonSchema.php

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Ticket URL: <https://core.trac.wordpress.org/ticket/60387>
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