Description
I'm trying to use this for a project instead of the published version of assert_cli. I'm super impressed by what you've accomplished here in the short time!
It seems that currently, there is no easy way to check that the output of a command contains some text. Or did I miss something?
Predicates only has a str::contains but stdout is a Vec<u8>. It seems that it could work with predicate::function, but it is quite cumbersome. I'm basically looking for good way of writing .stdout(&predicate::function(|x: &Vec<u8>| String::from_utf8_lossy(x).contains("Done!"))) -- but ideally without the need to use from_utf8_lossy. This last requirement is also why I opened this issue here, and not on the predicates, I expect we may need to talk about how to best deal with the Vec<u8> representation.