Python 3.13: Replace deprecated makeSuite() (#65)

The function has been deprecated in Python 3.11 and is no longer
available in Python 3.13.

testcfg.py

@@ -11,7 +11,7 @@ class ConfigTestCase(unittest.TestCase):
     miltersrs = cp.getboolean('srsmilter','miltersrs')
     self.assertFalse(miltersrs)
 
-def suite(): return unittest.makeSuite(ConfigTestCase,'test')
+def suite(): return unittest.TestLoader().loadTestsFromTestCase(ConfigTestCase)
 
 if __name__ == '__main__':
   unittest.main()

testgrey.py

@@ -49,7 +49,7 @@ class GreylistTestCase(unittest.TestCase):
     grey.close()
 
 def suite():
-  s = unittest.makeSuite(GreylistTestCase,'test')
+  s = unittest.TestLoader().loadTestsFromTestCase(GreylistTestCase)
   return s
 
 if __name__ == '__main__':

testmime.py

@@ -234,7 +234,7 @@ class MimeTestCase(unittest.TestCase):
     #print(msg + filter.msg)
     self.assertTrue(result.getvalue() == msg + filter.msg)
 
-def suite(): return unittest.makeSuite(MimeTestCase,'test')
+def suite(): return unittest.TestLoader().loadTestsFromTestCase(MimeTestCase)
 
 if __name__ == '__main__':
   if len(sys.argv) < 2:

testpolicy.py

@@ -42,7 +42,7 @@ class PolicyTestCase(unittest.TestCase):
       pol = p.getPolicy('smtp-test')
     self.assertEqual(pol,'WILDCARD')
 
-def suite(): return unittest.makeSuite(PolicyTestCase,'test')
+def suite(): return unittest.TestLoader().loadTestsFromTestCase(PolicyTestCase)
 
 if __name__ == '__main__':
   if len(sys.argv) < 2:

testsample.py

@@ -142,7 +142,7 @@ class BMSMilterTestCase(unittest.TestCase):
         f.write(fp.getvalue())
     milter.close()
 
-def suite(): return unittest.makeSuite(BMSMilterTestCase,'test')
+def suite(): return unittest.TestLoader().loadTestsFromTestCase(BMSMilterTestCase)
 
 if __name__ == '__main__':
   unittest.main()

testutils.py

@@ -54,7 +54,7 @@ class AddrCacheTestCase(unittest.TestCase):
     self.assertEqual(s,('WRONG', 'a@b'))
 
 def suite():
-  s = unittest.makeSuite(AddrCacheTestCase,'test')
+  s = unittest.TestLoader().loadTestsFromTestCase(AddrCacheTestCase)
   s.addTest(doctest.DocTestSuite(Milter.utils))
   s.addTest(doctest.DocTestSuite(Milter.dynip))
   s.addTest(doctest.DocTestSuite(Milter.pyip6))