Test cases from Cowlishaw, v2.57. All are pased cleanly.
diff --git a/Lib/test/decimaltestdata/logb.decTest b/Lib/test/decimaltestdata/logb.decTest
index 577f7a4..a672206 100644
--- a/Lib/test/decimaltestdata/logb.decTest
+++ b/Lib/test/decimaltestdata/logb.decTest
@@ -17,7 +17,7 @@
 --   IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK         --

 --   mfc@uk.ibm.com                                                   --

 ------------------------------------------------------------------------

-version: 2.56

+version: 2.57

 

 -- This emphasises the testing of notable cases, as they will often

 -- have unusual paths (especially the 10**n results).