[TechBro8615]

The script is for static analysis, so it only needs to run once against each code change, and in theory it shouldn't need to be portable code, unless the code under test is the static analysis code itself.

In other words, they control where this script runs and there is no need to run it on more than one platform, so it's okay for it to be non-portable.

[hvdijk]

That's fine if the script only runs on shells that behave the same way, but the script runs under bats, which runs on bash and appears to not change its xpg_echo shell option. This shell option controls echo's behaviour on bash and has a compile-time-configurable default; even scripts that are only meant to run on bash cannot assume either behaviour for echo, as different vendors use different defaults for the option.