test results default to success at 0 bytes

[kittenkamala]

Test reports are defaulting to success at 0 bytes which can lead to false positives when tests do actually fail further in the process.

Re:
https://wordpress.slack.com/archives/C3D6T7F8Q/p1776180323965219?thread_ts=1776180139.080169&cid=C3D6T7F8Q