Struct Fixtures 

pub struct Fixtures {
    pub passing: Job,
    pub failing: Job,
    pub erroring: Job,
    pub slow: Job,
    pub in_directory: Option<Job>,
}

Jobs meaningful to one backend.

Supplied by the caller because “a command that exits 3” is spelled differently in a VM than in a subprocess, which is exactly what the seam abstracts. The checks are about the verdicts, never about the commands that produced them.

Fields

passing: Job

A command that exits zero.

failing: Job

A command that exits nonzero.

erroring: Job

A job the provider cannot start at all.

slow: Job

A job that outlives its deadline.

in_directory: Option<Job>

A job that passes only if the executor ran it in Job::directory, and fails otherwise. None for a backend with no directory to honor – an isolation boundary the caller’s filesystem does not cross is the ordinary case, and skipping is the honest answer rather than a failure.