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gh-109566: regrtest reexecutes the process (#109909)

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When --fast-ci or --slow-ci option is used, regrtest now replaces the
current process with a new process to add "-u -W default -bb -E"
options to Python.

Changes:

* PCbuild/rt.bat and Tools/scripts/run_tests.py no longer need to add
  "-u -W default -bb -E" options to Python: it's now done by
  regrtest.
* Fix Tools/scripts/run_tests.py: flush stdout before replacing the
  process. Previously, buffered messages were lost.
This commit is contained in:
Victor Stinner 2023-09-26 20:46:52 +02:00 • committed by GitHub
parent ecd813f054
commit fbfec5642e
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7 changed files with 107 additions and 14 deletions
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58
Lib/test/test_regrtest.py
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@ -382,7 +382,8 @@ class ParseArgsTestCase(unittest.TestCase):
# Check Regrtest attributes which are more reliable than Namespace
# which has an unclear API
regrtest = main.Regrtest(ns)
self.assertNotEqual(regrtest.num_workers, 0)
self.assertTrue(regrtest.ci_mode)
self.assertEqual(regrtest.num_workers, -1)
self.assertTrue(regrtest.want_rerun)
self.assertTrue(regrtest.randomize)
self.assertIsNone(regrtest.random_seed)
@ -1960,6 +1961,61 @@ class ArgsTestCase(BaseTestCase):
self.check_executed_tests(output, tests,
stats=len(tests), parallel=True)
def check_reexec(self, option):
# --fast-ci and --slow-ci add "-u -W default -bb -E" options to Python
code = textwrap.dedent(r"""
import sys
import unittest
try:
from _testinternalcapi import get_config
except ImportError:
get_config = None
class WorkerTests(unittest.TestCase):
@unittest.skipUnless(get_config is None, 'need get_config()')
def test_config(self):
config = get_config()['config']
# -u option
self.assertEqual(config['buffered_stdio'], 0)
# -W default option
self.assertTrue(config['warnoptions'], ['default'])
# -bb option
self.assertTrue(config['bytes_warning'], 2)
# -E option
self.assertTrue(config['use_environment'], 0)
# test if get_config() is not available
def test_unbuffered(self):
# -u option
self.assertFalse(sys.stdout.line_buffering)
self.assertFalse(sys.stderr.line_buffering)
def test_python_opts(self):
# -W default option
self.assertTrue(sys.warnoptions, ['default'])
# -bb option
self.assertEqual(sys.flags.bytes_warning, 2)
# -E option
self.assertTrue(sys.flags.ignore_environment)
""")
testname = self.create_test(code=code)
cmd = [sys.executable,
"-m", "test", option,
f'--testdir={self.tmptestdir}',
testname]
proc = subprocess.run(cmd,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
text=True)
self.assertEqual(proc.returncode, 0, proc)
def test_reexec_fast_ci(self):
self.check_reexec("--fast-ci")
def test_reexec_slow_ci(self):
self.check_reexec("--slow-ci")
class TestUtils(unittest.TestCase):
def test_format_duration(self):