narrow tested properties in cli tests

[soenkehahn]

What do people think of this? This is using a tiny crate that I came up with yesterday: unsafe_get. We could also just put this into this project. But it seems generally useful. Should I put it on crates.io?

@matthandlersux @jondistad @data-pup @hallettj

[hallettj]

I think it could be useful to have that crate available.

[matthandlersux]

LGTM. IMO the macro name could be more descriptive, though. something like:

            get_enum_field!(
                parse_args_safe(vec!["program", "file"].into_iter().map(String::from))?,
                Args::Scriptkeeper,
                script_path
            )

[data-pup]

this is really neat, I would endorse that as a separate crate for sure 🙂