Only override unittest assertions when absolutely necessary.

Fixes #85

NEWS

@@ -18,6 +18,11 @@
 * #90: Ensure that callbacks handed to `SFTPClient.get()` always fire at least
   once, even for zero-length files downloaded. Thanks to Github user `@enB` for
   the catch.
+* #85: Paramiko's test suite overrides
+  `unittest.TestCase.assertTrue/assertFalse` to provide these modern assertions
+  to Python 2.2/2.3, which lacked them. However on newer Pythons such as 2.7,
+  this now causes deprecation warnings. The overrides have been patched to only
+  execute when necessary. Thanks to `@Arfrever` for catch & patch.
 
 
 v1.8.0 (3rd Oct 2012)

tests/test_transport.py

@@ -107,4 +107,5 @@
 
 class TransportTest (unittest.TestCase):
 
+    if not hasattr(unittest.TestCase, 'assertTrue'):
         assertTrue = unittest.TestCase.failUnless   # for Python 2.3 and below
@@ -110,4 +111,5 @@
         assertTrue = unittest.TestCase.failUnless   # for Python 2.3 and below
+    if not hasattr(unittest.TestCase, 'assertFalse'):
         assertFalse = unittest.TestCase.failIf      # for Python 2.3 and below
 
     def setUp(self):