gh-141174: Test re-stringifying a ForwardRef - #155689
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ForwardRef with STRING formatForwardRef
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needs backport to 3.14
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Thanks @dr-carlos for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14, 3.15. |
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GH-155707 is a backport of this pull request to the 3.15 branch. |
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GH-155708 is a backport of this pull request to the 3.14 branch. |
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Currently, every
ForwardRef.evaluate(format=Format.STRING)test intest_annotationlibis done with an empty__resolved_string_cache__, so there is no test that re-evaluations are correct (or that they actually use the cache).That is to say, the condition
self.__resolved_str_cache__ is Noneis always true:cpython/Lib/annotationlib.py
Line 244 in 025e7d2
Thus, this PR adds a simple test to re-stringify a stringified fwdref.
That said, I'm not 100% on whether the current test is correct: it's testing the behaviour that the cache has to be returned identically - which is the correct behaviour, and this test already tests the content of the cache - but I'm not sure if we want to cement that exact behaviour. So, happy to make it an equality (instead of identity) check if it's preferred.