bpo-45229: Remove test_main in many tests (GH-28405)

Instead of explicitly enumerate test classes for run_unittest()
use the unittest ability to discover tests. This also makes these
tests discoverable and runnable with unittest.

load_tests() can be used for dynamic generating tests and adding
doctests. setUpModule(), tearDownModule() and addModuleCleanup()
can be used for running code before and after all module tests.

1 files changed, 2 insertions, 5 deletions

diff --git a/Lib/test/test_fcntl.py b/Lib/test/test_fcntl.py
index 83ee7a5b0d..fc8c39365f 100644
--- a/Lib/test/test_fcntl.py
+++ b/Lib/test/test_fcntl.py
@@ -6,7 +6,7 @@ import struct
 import sys
 import unittest
 from multiprocessing import Process
-from test.support import (verbose, run_unittest, cpython_only)
+from test.support import verbose, cpython_only
 from test.support.import_helper import import_module
 from test.support.os_helper import TESTFN, unlink
 
@@ -210,8 +210,5 @@ class TestFcntl(unittest.TestCase):
             os.close(test_pipe_w)
 
 
-def test_main():
-    run_unittest(TestFcntl)
-
 if __name__ == '__main__':
-    test_main()
+    unittest.main()