[wp-trac] [WordPress Trac] #53364: Tests: Reduce usage of assertEquals for 5.9

[WordPress Trac]

#53364: Tests: Reduce usage of assertEquals for 5.9
------------------------------+-----------------------------------
 Reporter:  desrosj           |      Owner:  (none)
     Type:  task (blessed)    |     Status:  new
 Priority:  normal            |  Milestone:  5.9
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:  needs-unit-tests php8
  Focuses:                    |
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 Follow-up to:

 * #52482 for 5.8
 * #38266 for 5.7

 The `assertEquals()` test method does not check that the types of the
 expected and actual values match. This can hide subtle bugs especially
 when the values are falsey.

 Tasks:

 * Switch to using `assertSame()` when the type of the value in the
 assertion is important
 * Replace overall usage of `assertEquals()` with type-strict assertion
 methods, with the aim of potentially removing its usage altogether

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Ticket URL: <https://core.trac.wordpress.org/ticket/53364>
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