2 files changed, 34 insertions, 0 deletions
diff --git a/Lib/test/test_asyncio/test_base_events.py b/Lib/test/test_asyncio/test_base_events.py
index 2eee3be..784a39f 100644
--- a/Lib/test/test_asyncio/test_base_events.py
+++ b/Lib/test/test_asyncio/test_base_events.py
@@ -197,6 +197,12 @@ class BaseEventLoopTests(unittest.TestCase):
         self.assertEqual([h2], self.loop._scheduled)
         self.assertTrue(self.loop._process_events.called)
 
+    def test_set_debug(self):
+        self.loop.set_debug(True)
+        self.assertTrue(self.loop.get_debug())
+        self.loop.set_debug(False)
+        self.assertFalse(self.loop.get_debug())
+
     @unittest.mock.patch('asyncio.base_events.time')
     @unittest.mock.patch('asyncio.base_events.logger')
     def test__run_once_logging(self, m_logger, m_time):
diff --git a/Lib/test/test_asyncio/test_tasks.py b/Lib/test/test_asyncio/test_tasks.py
index f27b952..6d03dc7 100644
--- a/Lib/test/test_asyncio/test_tasks.py
+++ b/Lib/test/test_asyncio/test_tasks.py
@@ -1,7 +1,9 @@
 """Tests for tasks.py."""
 
 import gc
+import os.path
 import unittest
+from test.script_helper import assert_python_ok
 
 import asyncio
 from asyncio import test_utils
@@ -1461,6 +1463,32 @@ class GatherTestsBase:
         cb.assert_called_once_with(fut)
         self.assertEqual(fut.result(), [3, 1, exc, exc2])
 
+    def test_env_var_debug(self):
+        path = os.path.dirname(asyncio.__file__)
+        path = os.path.normpath(os.path.join(path, '..'))
+        code = '\n'.join((
+            'import sys',
+            'sys.path.insert(0, %r)' % path,
+            'import asyncio.tasks',
+            'print(asyncio.tasks._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)
+        self.assertEqual(stdout.rstrip(), b'False')
+
+        sts, stdout, stderr = assert_python_ok('-c', code,
+                                               PYTHONASYNCIODEBUG='')
+        self.assertEqual(stdout.rstrip(), b'False')
+
+        sts, stdout, stderr = assert_python_ok('-c', code,
+                                               PYTHONASYNCIODEBUG='1')
+        self.assertEqual(stdout.rstrip(), b'True')
+
+        sts, stdout, stderr = assert_python_ok('-E', '-c', code,
+                                               PYTHONASYNCIODEBUG='1')
+        self.assertEqual(stdout.rstrip(), b'False')
+
 
 class FutureGatherTests(GatherTestsBase, unittest.TestCase):