Thanks zaxxon for your response. I have slighty changed my erquirement

start testcase: config loading
......
error XXXX
.....
end testcase: config loading, result failed
start testcase: ping check
.....
error ZZZZZ
.....
error AAAAA
end testcase: Ping check, result failed
start testcase: unconfig
.....
.....
end testcase: unconfig, result passed

I am expecting below output.

Testcase: config loading
error XXXX
error YYYY

Testcase: ping check
error ZZZZ
error AAAA