Issue #21741: Update 147 test modules to use test discovery.

I have compared output between pre- and post-patch runs of these tests
to make sure there's nothing missing and nothing broken, on both
Windows and Linux.  The only differences I found were actually tests
that were previously *not* run.

1 files changed, 1 insertions, 5 deletions

diff --git a/Lib/test/test_contains.py b/Lib/test/test_contains.py
index a667a16d8c7..3c6bdeffda3 100644
--- a/Lib/test/test_contains.py
+++ b/Lib/test/test_contains.py
@@ -1,5 +1,4 @@
 from collections import deque
-from test.support import run_unittest
 import unittest
 
 
@@ -86,8 +85,5 @@ class TestContains(unittest.TestCase):
             self.assertTrue(container == container)
 
 
-def test_main():
-    run_unittest(TestContains)
-
 if __name__ == '__main__':
-    test_main()
+    unittest.main()