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gh-82054: Implements test.regrtest unittest sharding to pull in long tails for asyncio #103852

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gh-82054: Implements test.regrtest unittest sharding to pull in long tails for asyncio #103852

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23 changes: 20 additions & 3 deletions Lib/test/libregrtest/runtest.py
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Original file line number Diff line number Diff line change
Expand Up @@ -143,6 +143,15 @@ def __str__(self) -> str:
# set of tests that we don't want to be executed when using regrtest
NOTTESTS = set()

#If these test directories are encountered recurse into them and treat each
# test_ .py or dir as a separate test module. This can increase parallelism.
# Beware this can't generally be done for any directory with sub-tests as the
# __init__.py may do things which alter what tests are to be run.

SPLITTESTDIRS = {
"test_asyncio",
"test_compiler",
}

# Storage of uncollectable objects
FOUND_GARBAGE = []
Expand All @@ -158,16 +167,24 @@ def findtestdir(path=None):
return path or os.path.dirname(os.path.dirname(__file__)) or os.curdir


def findtests(testdir=None, stdtests=STDTESTS, nottests=NOTTESTS):
def findtests(testdir=None, stdtests=STDTESTS, nottests=NOTTESTS, splittestdirs=SPLITTESTDIRS, base_mod=""):
"""Return a list of all applicable test modules."""
testdir = findtestdir(testdir)
names = os.listdir(testdir)
tests = []
others = set(stdtests) | nottests
for name in names:
mod, ext = os.path.splitext(name)
if mod[:5] == "test_" and ext in (".py", "") and mod not in others:
tests.append(mod)
if mod[:5] == "test_" and mod not in others:
if mod in splittestdirs:
subdir = os.path.join(testdir, mod)
if len(base_mod):
mod = f"{base_mod}.{mod}"
else:
mod = f"test.{mod}"
tests.extend(findtests(subdir, [], nottests, splittestdirs, mod))
elif ext in (".py", ""):
tests.append(f"{base_mod}.{mod}" if len(base_mod) else mod)
return stdtests + sorted(tests)


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