A small adapter object to let you both write to stderr/stdout and capture that output.
See the docs on tee::Tee for more details on how it works.
# Cargo.toml
[dependencies]
tee = { git = "https://github.com/nataliejameson/tee", tag = "0.1.0" }fn main() {
let tee_err = Tee::new(std::io::stderr())?;
let res = std::process::Command::new(["sh"])
.args(["-c", "echo \"fail\" >&2; exit 1;"])
.stderr(tee_err.clone())
.output()?
.unwrap();
assert_eq!(0, res.stderr.len());
let stderr_out = String::from_utf8(tee_err.get_output().unwrap()).unwrap();
assert_eq!("fail\n", stderr_out);
}
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