Don't run importlib tests for the "source" version

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Issue 类型
重构
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基本清楚
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技术栈
python
领域
testing-qa

调研方向

从 Lib/test/test_importlib/test_api.py 中约第 97-99 行的 importlib 测试设置开始，然后检查 source 和 frozen 测试路径，以及 #92265 中描述的问题。确定 source 版本测试提供了哪些覆盖；完成的标准是记录理由，并且仅在该覆盖没有必要时修改测试套件。

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描述

tests topic-importlib type-feature

Feature or enhancement

Simplify the test suite by not running the importlib tests on the source version, only the frozen one.

Pitch

Currently, we are running the tests against both the source and frozen versions of importlib.

Example:
https://github.com/python/cpython/blob/main/Lib/test/test_importlib/test_api.py#L97-L99

In #92265, we ran into a non-trivial issue where the frozen finders were leaking into source version of the tests, and I suspect some other tests might have the same issue. Me and @ericsnowcurrently spent quite a bit of time tracking it down, though I acknowledge it could have been easier for someone like Brett, who is more versed in this part of the code.

AFAICT, the only version of the modules users will actually use is the frozen one, making me question if the increased complexity in the test suite is worth it. I am under the impression that this was not always the case, which would explain a bit better why we are testing both versions.

So, would it be reasonable to simply remove the source version of the tests? What value is it actually providing? Did I overlook something here?

cc @brettcannon @ericsnowcurrently @warsaw

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