--show-output with cargo test
February 2, 2024
daybook, rust, testing | permalink
cargo test does not display any standard output from successful tests, just that the results were successful. To get around this and see the output of dbg! or println! statements, I usually make a false assertion so that a test fails and these get shown. However, an easier way is to use the --show-output flag: cargo test -- --show-output, as mentioned in the Book. The cargo test section of the Cargo Book does not list this (for some reason unclear to me), but instead cargo test -- --nocapture, which has the same effect. I'm pretty sure I've come across --nocapture before, but I think --show-output will be easier to remember. Well, maybe. I've definitely read the book and forgot about --show-output. Noting here should help.