bpo-46425: fix direct invocation of asyncio tests (GH-30725)

(cherry picked from commit 5a5340044c)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>

Lib/test/test_asyncio/test_context.py

@@ -32,3 +32,7 @@ class DecimalContextTest(unittest.TestCase):
 
         self.assertEqual(str(r2[0]), '0.333333')
         self.assertEqual(str(r2[1]), '0.111111')
+
+
+if __name__ == '__main__':
+    unittest.main()

Lib/test/test_asyncio/test_futures2.py

@@ -16,3 +16,7 @@ class FutureTests(unittest.IsolatedAsyncioTestCase):
         # The check for returned string is not very reliable but
         # exact comparison for the whole string is even weaker.
         self.assertIn('...', repr(await asyncio.wait_for(func(), timeout=10)))
+
+
+if __name__ == '__main__':
+    unittest.main()

Lib/test/test_asyncio/test_protocols.py

@@ -55,3 +55,7 @@ class ProtocolsAbsTests(unittest.TestCase):
         self.assertIsNone(sp.pipe_connection_lost(1, f))
         self.assertIsNone(sp.process_exited())
         self.assertFalse(hasattr(sp, '__dict__'))
+
+
+if __name__ == '__main__':
+    unittest.main()

Lib/test/test_asyncio/test_runners.py

@@ -2,7 +2,7 @@ import asyncio
 import unittest
 
 from unittest import mock
-from . import utils as test_utils
+from test.test_asyncio import utils as test_utils
 
 
 class TestPolicy(asyncio.AbstractEventLoopPolicy):
@@ -180,3 +180,7 @@ class RunTests(BaseTest):
 
         self.assertIsNone(spinner.ag_frame)
         self.assertFalse(spinner.ag_running)
+
+
+if __name__ == '__main__':
+    unittest.main()

Lib/test/test_asyncio/test_sendfile.py

@@ -560,3 +560,7 @@ else:
 
         def create_event_loop(self):
             return asyncio.SelectorEventLoop(selectors.SelectSelector())
+
+
+if __name__ == '__main__':
+    unittest.main()

Lib/test/test_asyncio/test_sock_lowlevel.py

@@ -1,5 +1,4 @@
 import socket
-import time
 import asyncio
 import sys
 import unittest
@@ -508,3 +507,7 @@ else:
 
         def create_event_loop(self):
             return asyncio.SelectorEventLoop(selectors.SelectSelector())
+
+
+if __name__ == '__main__':
+    unittest.main()