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[3.10] bpo-40173: Fix test.support.import_helper.import_fresh_module() (GH-28654) (GH-28657)

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* Work correctly if an additional fresh module imports other
  additional fresh module which imports a blocked module.
* Raises ImportError if the specified module cannot be imported
  while all additional fresh modules are successfully imported.
* Support blocking packages.
* Always restore the import state of fresh and blocked modules
  and their submodules.
* Fix test_decimal and test_xml_etree which depended on an undesired
  side effect of import_fresh_module().
(cherry picked from commit ec4d917a6a)
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Serhiy Storchaka 2021-09-30 19:56:41 +03:00 • committed by GitHub
parent 80285ecc8d
commit 7873884d47
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4 changed files with 32 additions and 52 deletions
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Lib/test/test_decimal.py
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@ -62,7 +62,7 @@
C = import_fresh_module('decimal', fresh=['_decimal'])
P = import_fresh_module('decimal', blocked=['_decimal'])
orig_sys_decimal = sys.modules['decimal']
import decimal as orig_sys_decimal
# fractions module must import the correct decimal module.
cfractions = import_fresh_module('fractions', fresh=['fractions'])