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From: Mariusz Felisiak <felisiak.mariusz@gmail.com>
Date: Wed, 16 Oct 2024 19:37:20 +0200
Subject: Refs #35844 -- Fixed tests for test --parallel option on Python
3.14+.
"forkserver" is the new default on POSIX systems, and Django doesn't
support parallel tests with "forkserver":
https://github.com/python/cpython/commit/b65f2cdfa77d8d12c213aec663ddaaa30d75a4b2
Origin: upstream, https://github.com/django/django/pull/18685
Bug-Debian: https://bugs.debian.org/1122185
Last-Update: 2025-12-17
---
tests/test_runner/test_discover_runner.py | 1 +
tests/test_runner/tests.py | 5 +++++
2 files changed, 6 insertions(+)
diff --git a/tests/test_runner/test_discover_runner.py b/tests/test_runner/test_discover_runner.py
index bca9037..5c94695 100644
--- a/tests/test_runner/test_discover_runner.py
+++ b/tests/test_runner/test_discover_runner.py
@@ -44,6 +44,7 @@ def change_loader_patterns(patterns):
@mock.patch.dict(os.environ, {}, clear=True)
@mock.patch.object(multiprocessing, "cpu_count", return_value=12)
# Python 3.8 on macOS defaults to 'spawn' mode.
+# Python 3.14 on POSIX systems defaults to 'forkserver' mode.
@mock.patch.object(multiprocessing, "get_start_method", return_value="fork")
class DiscoverRunnerParallelArgumentTests(SimpleTestCase):
def get_parser(self):
diff --git a/tests/test_runner/tests.py b/tests/test_runner/tests.py
index c8b40ea..03444f1 100644
--- a/tests/test_runner/tests.py
+++ b/tests/test_runner/tests.py
@@ -481,6 +481,7 @@ class ManageCommandTests(unittest.TestCase):
@mock.patch.dict(os.environ, {}, clear=True)
@mock.patch.object(multiprocessing, "cpu_count", return_value=12)
class ManageCommandParallelTests(SimpleTestCase):
+ @mock.patch.object(multiprocessing, "get_start_method", return_value="fork")
def test_parallel_default(self, *mocked_objects):
with captured_stderr() as stderr:
call_command(
@@ -490,6 +491,7 @@ class ManageCommandParallelTests(SimpleTestCase):
)
self.assertIn("parallel=12", stderr.getvalue())
+ @mock.patch.object(multiprocessing, "get_start_method", return_value="fork")
def test_parallel_auto(self, *mocked_objects):
with captured_stderr() as stderr:
call_command(
@@ -525,12 +527,14 @@ class ManageCommandParallelTests(SimpleTestCase):
self.assertEqual(stderr.getvalue(), "")
@mock.patch.dict(os.environ, {"DJANGO_TEST_PROCESSES": "7"})
+ @mock.patch.object(multiprocessing, "get_start_method", return_value="fork")
def test_no_parallel_django_test_processes_env(self, *mocked_objects):
with captured_stderr() as stderr:
call_command("test", testrunner="test_runner.tests.MockTestRunner")
self.assertEqual(stderr.getvalue(), "")
@mock.patch.dict(os.environ, {"DJANGO_TEST_PROCESSES": "invalid"})
+ @mock.patch.object(multiprocessing, "get_start_method", return_value="fork")
def test_django_test_processes_env_non_int(self, *mocked_objects):
with self.assertRaises(ValueError):
call_command(
@@ -540,6 +544,7 @@ class ManageCommandParallelTests(SimpleTestCase):
)
@mock.patch.dict(os.environ, {"DJANGO_TEST_PROCESSES": "7"})
+ @mock.patch.object(multiprocessing, "get_start_method", return_value="fork")
def test_django_test_processes_parallel_default(self, *mocked_objects):
for parallel in ["--parallel", "--parallel=auto"]:
with self.subTest(parallel=parallel):
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