Comment # 1 on bug 1124156 from Michael Andres

This is a feature and it in since 2009. You can coinfigure it, if you like to:

[zypp.conf]
##
## When committing a dist upgrade (e.g. 'zypper dup') a solver testcase
## is written to /var/log/updateTestcase-<date>. It is needed in bugreports.
## This option returns the number of testcases to keep on the system. Old
## cases will be deleted, as new ones are created.
##
## Use 0 to write no testcase at all, or -1 to keep all testcases.
##
## Valid values:        Integer
## Default value:       2
##
# solver.upgradeTestcasesToKeep = 2