Executing:

bin/infection --test-framework=phpstan --quiet

Will cause a failure. This is because the Symfony Application will adjust SHELL_VERBOSITY accordingly and the process we start to get the package version inherits those environment variables, so we end up doing SHELL_VERBOSITY=-2 phpstan --version --no-ansi which will yield an empty string.

Fixing this should not be too hard, finding how to properly test it without looking completely artificial is a bit more annoying.