[3.13] gh-152548: Add a test.support.isolation.runInSubprocess() decorator (GH-152551) - #154784
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[3.13] gh-152548: Add a test.support.isolation.runInSubprocess() decorator (GH-152551)#154784serhiy-storchaka wants to merge 1 commit into
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…ator (pythonGH-152551) Run a test in a fresh interpreter subprocess, so that it does not share global or interpreter state with the rest of the test run. It can decorate a test method (only that method runs in a subprocess) or a TestCase subclass (the whole class runs in one subprocess, with its setUpClass()/setUp()/tearDown()/ tearDownClass() running there rather than in the parent). Failures, errors and skips, including those of individual subtests, are reported for the test; a failure or an error shows the original subprocess traceback. The subprocess inherits the parent's resource, memory, verbosity and failfast configuration, so that requires_resource(), bigmemtest() and similar behave the same in both processes. A decorated test is skipped where subprocesses are unavailable, since it must spawn one. The test.support.isolation.runningInSubprocess flag is true in the subprocess, so that fixtures can choose what to run there. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> (cherry picked from commit bde526d)
This was referenced Jul 27, 2026
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Manual backport of GH-152551 to
3.13; miss-islington could not do it automatically.The only conflict was in
Lib/test/test_support.py:3.13has neitherTestHashlibSupportnor itshashlib_helperimport, so the appendedTestIsolatedclass had no matching context and that unrelated class was swept into the conflict. Only theisolationimport andTestIsolatedare taken here; everything else is identical to what landed in main.Verified against a 3.13 build:
test_supportpasses, with all nineTestIsolatedtests running.(cherry picked from commit bde526d)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com