mtn: 2 heads on branch 'testbranch'
mtn: merge 1 / 1:
mtn: calculating best pair of heads to merge next
mtn: [left]  bcd098b31f9ed42acfb5ab550c973e7d8f7203fd
mtn: [right] c28c3c0f5a7f9cde848be91f79d86a6dd63e88ca
mtn: [merged] 7f38dd536c4f995a4a7ccd788d2b5be2755805cf
