bpo-32101: Fix tests for PYTHONDEVMODE=1 (#4821)

test_asycio: remove also aio_path which was used when asyncio was
developed outside the stdlib.

Lib/test/test_asyncio/test_base_events.py

@@ -802,17 +802,20 @@ class BaseEventLoopTests(test_utils.TestCase):
         self.assertEqual(stdout.rstrip(), b'False')
 
         sts, stdout, stderr = assert_python_ok('-c', code,
-                                               PYTHONASYNCIODEBUG='')
+                                               PYTHONASYNCIODEBUG='',
+                                               PYTHONDEVMODE='')
         self.assertEqual(stdout.rstrip(), b'False')
 
         sts, stdout, stderr = assert_python_ok('-c', code,
-                                               PYTHONASYNCIODEBUG='1')
+                                               PYTHONASYNCIODEBUG='1',
+                                               PYTHONDEVMODE='')
         self.assertEqual(stdout.rstrip(), b'True')
 
         sts, stdout, stderr = assert_python_ok('-E', '-c', code,
                                                PYTHONASYNCIODEBUG='1')
         self.assertEqual(stdout.rstrip(), b'False')
 
+        # -X dev
         sts, stdout, stderr = assert_python_ok('-E', '-X', 'dev',
                                                '-c', code)
         self.assertEqual(stdout.rstrip(), b'True')

Lib/test/test_asyncio/test_tasks.py

@@ -2257,33 +2257,31 @@ class GatherTestsBase:
         self.assertEqual(fut.result(), [3, 1, exc, exc2])
 
     def test_env_var_debug(self):
-        aio_path = os.path.dirname(os.path.dirname(asyncio.__file__))
-
         code = '\n'.join((
             'import asyncio.coroutines',
             'print(asyncio.coroutines._DEBUG)'))
 
         # Test with -E to not fail if the unit test was run with
         # PYTHONASYNCIODEBUG set to a non-empty string
-        sts, stdout, stderr = assert_python_ok('-E', '-c', code,
-                                               PYTHONPATH=aio_path)
+        sts, stdout, stderr = assert_python_ok('-E', '-c', code)
         self.assertEqual(stdout.rstrip(), b'False')
 
         sts, stdout, stderr = assert_python_ok('-c', code,
                                                PYTHONASYNCIODEBUG='',
-                                               PYTHONPATH=aio_path)
+                                               PYTHONDEVMODE='')
         self.assertEqual(stdout.rstrip(), b'False')
 
         sts, stdout, stderr = assert_python_ok('-c', code,
                                                PYTHONASYNCIODEBUG='1',
-                                               PYTHONPATH=aio_path)
+                                               PYTHONDEVMODE='')
         self.assertEqual(stdout.rstrip(), b'True')
 
         sts, stdout, stderr = assert_python_ok('-E', '-c', code,
                                                PYTHONASYNCIODEBUG='1',
-                                               PYTHONPATH=aio_path)
+                                               PYTHONDEVMODE='')
         self.assertEqual(stdout.rstrip(), b'False')
 
+        # -X dev
         sts, stdout, stderr = assert_python_ok('-E', '-X', 'dev',
                                                '-c', code)
         self.assertEqual(stdout.rstrip(), b'True')

Lib/test/test_faulthandler.py

@@ -332,13 +332,9 @@ class FaultHandlerTests(unittest.TestCase):
     def test_disabled_by_default(self):
         # By default, the module should be disabled
         code = "import faulthandler; print(faulthandler.is_enabled())"
-        args = filter(None, (sys.executable,
-                             "-E" if sys.flags.ignore_environment else "",
-                             "-c", code))
-        env = os.environ.copy()
-        env.pop("PYTHONFAULTHANDLER", None)
+        args = (sys.executable, "-E", "-c", code)
         # don't use assert_python_ok() because it always enables faulthandler
-        output = subprocess.check_output(args, env=env)
+        output = subprocess.check_output(args)
         self.assertEqual(output.rstrip(), b"False")
 
     def test_sys_xoptions(self):
@@ -357,15 +353,17 @@ class FaultHandlerTests(unittest.TestCase):
         # empty env var
         code = "import faulthandler; print(faulthandler.is_enabled())"
         args = (sys.executable, "-c", code)
-        env = os.environ.copy()
+        env = dict(os.environ)
         env['PYTHONFAULTHANDLER'] = ''
+        env['PYTHONDEVMODE'] = ''
         # don't use assert_python_ok() because it always enables faulthandler
         output = subprocess.check_output(args, env=env)
         self.assertEqual(output.rstrip(), b"False")
 
         # non-empty env var
-        env = os.environ.copy()
+        env = dict(os.environ)
         env['PYTHONFAULTHANDLER'] = '1'
+        env['PYTHONDEVMODE'] = ''
         output = subprocess.check_output(args, env=env)
         self.assertEqual(output.rstrip(), b"True")