Sergey Biryukov 78b37f39f6 Tests: Use assertSame() in new_admin_email_subject filter test.
This ensures that not only the return values match the expected results, but also that their type is the same.

Going forward, stricter type checking by using `assertSame()` should generally be preferred to `assertEquals()` where appropriate, to make the tests more reliable.

Follow-up to [57283].

See #59655.

git-svn-id: https://develop.svn.wordpress.org/trunk@57706 602fd350-edb4-49c9-b593-d223f7449a82
2024-02-25 15:25:49 +00:00
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