1 files changed, 13 insertions, 0 deletions
diff --git a/Lib/test/test_regrtest.py b/Lib/test/test_regrtest.py
index 17eff61..97ce797 100644
--- a/Lib/test/test_regrtest.py
+++ b/Lib/test/test_regrtest.py
@@ -473,6 +473,19 @@ class ParseArgsTestCase(unittest.TestCase):
         self.assertEqual(regrtest.hunt_refleak.runs, 10)
         self.assertFalse(regrtest.output_on_failure)
 
+    def test_single_process(self):
+        args = ['-j2', '--single-process']
+        with support.captured_stderr():
+            regrtest = self.create_regrtest(args)
+        self.assertEqual(regrtest.num_workers, 0)
+        self.assertTrue(regrtest.single_process)
+
+        args = ['--fast-ci', '--single-process']
+        with support.captured_stderr():
+            regrtest = self.create_regrtest(args)
+        self.assertEqual(regrtest.num_workers, 0)
+        self.assertTrue(regrtest.single_process)
+
 
 @dataclasses.dataclass(slots=True)
 class Rerun: