The test coverage for these functions is low as there are no dedicated tests for them. I propose we add tests for these functions.
This will come in handy if/when we decide to fix#64243.

Linked PRs

• gh-130655: Increase test coverage ofgettext._expand_lang #130656
• [3.13] gh-130655: Increase test coverage of gettext._expand_lang() (GH-130656) #130671
• [3.12] gh-130655: Increase test coverage of gettext._expand_lang() (GH-130656) #130672
• gh-130655: Add tests forgettext.find() #130691
• gh-130655: Add a test for bad magic numbers when parsing gettext MO files #131909
• gh-130655: Add a test for corrupt MO files in gettext #131911
• [3.13] gh-130655: Add a test for bad magic numbers in.mo files parsed bygettext (GH-131909) #132077
• [3.12] gh-130655: Add a test for bad magic numbers in.mo files parsed bygettext (GH-131909) #132078
• [3.13] gh-130655: Add a test for corrupt.mo files ingettext (GH-131911) #132079
• [3.12] gh-130655: Add a test for corrupt.mo files ingettext (GH-131911) #132080
• [3.12] gh-130655: Add tests forgettext.find() (GH-130691) #132083
• [3.13] gh-130655: Add tests forgettext.find() (GH-130691) #132084
• gh-130655: Movetest_gettext data to a separate file #132442
• gh-130655: Add a test for big-endian MO files ingettext #132469
• [3.13] gh-130655: Add a test for big-endian MO files in gettext (GH-132469) #133248
• gh-130655: add tests for dgettext #134594