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.
Props johnbillion, jrf, SergeyBiryukov.
See #38266.
git-svn-id: https://develop.svn.wordpress.org/trunk@48937 602fd350-edb4-49c9-b593-d223f7449a82