Convert test_contains, test_crypt, and test_select to unittest.

Patch from GHOP 294 by David Marek.
diff --git a/Misc/NEWS b/Misc/NEWS
index 539b785..7743e0b 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -50,6 +50,8 @@
 Tests
 -----
 
+- GHOP 294: Convert test_contains, test_crypt, and test_select to unittest.
+
 - GHOP 238: Convert test_tokenize to use doctest.
 
 - GHOP 237: Rewrite test_thread using unittest.