== setup three files contributing to totl 8888.0.0
== merge baseline into fs_root
8888.0.0 = 42, 3
== inject (+128, +2) unbalances totl 8888.0.0
8888.0.0 = 170, 5
== unlink f3 (value 32) produces a -32/-1 delta
8888.0.0 = 138, 4
== inject (-128, -2) restores accounting for the remaining files
8888.0.0 = 10, 2
== cleanup
