Remove unused imports in tests (GH-14518)

diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
index d83ee2c..ef17239 100644
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -26,7 +26,7 @@
 
 ssl = support.import_module("ssl")
 
-from ssl import TLSVersion, _TLSContentType, _TLSMessageType, _TLSAlertType
+from ssl import TLSVersion, _TLSContentType, _TLSMessageType
 
 Py_DEBUG = hasattr(sys, 'gettotalrefcount')
 Py_DEBUG_WIN32 = Py_DEBUG and sys.platform == 'win32'
@@ -4601,7 +4601,6 @@
 
 def test_main(verbose=False):
     if support.verbose:
-        import warnings
         plats = {
             'Mac': platform.mac_ver,
             'Windows': platform.win32_ver,