How to find out size of test files?

[cthulhu-rider]

Problem

https://rest.fs.neo.org/Aku38wpn2xEqfEPxmwyAa7N3VnAkMV8PEVkpLqwKM1z3/1526-1764802852/index.html#suites/87d8da5f92824d091055170c29079bc0/8c6f109b8fc517b7/

test files are generated to become payload of created objects. Sometimes i need to find out length of particular object's payload. This is easy if tests makes successful GET/HEAD of the object. But how to do it otherwise? I looked at the report and didn't find it

Context

nspcc-dev/neofs-node#3713 (comment)