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bpo-45410: regrtest replaces print_warning.orig_stderr (GH-28926)

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When running Python tests with -W, runtest() now replaces
support.print_warning.orig_stderr to preserve the messages order.

Add an unit test.
This commit is contained in:
Victor Stinner 2021-10-13 17:35:21 +02:00 • committed by GitHub
parent 713bb19356
commit 676201a59f
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3 changed files with 53 additions and 3 deletions
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40
Lib/test/test_regrtest.py
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@ -1300,6 +1300,46 @@ class ArgsTestCase(BaseTestCase):
self.assertIn("Warning -- Uncaught thread exception", output)
self.assertIn("Exception: bug in thread", output)
def test_print_warning(self):
# bpo-45410: The order of messages must be preserved when -W and
# support.print_warning() are used.
code = textwrap.dedent(r"""
import sys
import unittest
from test import support
class MyObject:
pass
def func_bug():
raise Exception("bug in thread")
class Tests(unittest.TestCase):
def test_print_warning(self):
print("msg1: stdout")
support.print_warning("msg2: print_warning")
# Fail with ENV CHANGED to see print_warning() log
support.environment_altered = True
""")
testname = self.create_test(code=code)
# Expect an output like:
#
# test_threading_excepthook (test.test_x.Tests) ... msg1: stdout
# Warning -- msg2: print_warning
# ok
regex = (r"test_print_warning.*msg1: stdout\n"
r"Warning -- msg2: print_warning\n"
r"ok\n")
for option in ("-v", "-W"):
with self.subTest(option=option):
cmd = ["--fail-env-changed", option, testname]
output = self.run_tests(*cmd, exitcode=3)
self.check_executed_tests(output, [testname],
env_changed=[testname],
fail_env_changed=True)
self.assertRegex(output, regex)
def test_unicode_guard_env(self):
guard = os.environ.get(setup.UNICODE_GUARD_ENV)
self.assertIsNotNone(guard, f"{setup.UNICODE_GUARD_ENV} not set")