Chris Muller uploaded a new version of KernelTests to project The Trunk:
http://source.squeak.org/trunk/KernelTests-cmm.142.mcz

==================== Summary ====================

Name: KernelTests-cmm.142
Author: cmm
Time: 5 March 2010, 3:59:31.392 pm
UUID: 4c5bf281-d5da-463e-ad70-386e912ac3b6
Ancestors: KernelTests-ul.141

Incorporated test demonstrating broken Year>>#previous, for leap years.

=============== Diff against KernelTests-ul.141 ===============

Item was added:
+ ----- Method: YearTest>>testPreviousInLeapYear (in category 'Tests') -----
+ testPreviousInLeapYear
+ 
+ 	| leap |
+ 	leap := Year year: 2008.
+ 	self assert: leap isLeapYear. 
+ 	self assert: (Year year: (leap year - 1)) = leap previous !