clap/tests/app_from_crate.rs

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Rust
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use clap::{app_from_crate, ErrorKind};
static EVERYTHING: &str = "clap {{version}}
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Kevin K. <kbknapp@gmail.com>:Clap Maintainers
A simple to use, efficient, and full-featured Command Line Argument Parser
USAGE:
clap
OPTIONS:
-h, --help Print help information
-V, --version Print version information
";
#[test]
fn app_from_crate() {
let res = app_from_crate!().try_get_matches_from(vec!["clap", "--help"]);
assert!(res.is_err());
let err = res.unwrap_err();
assert_eq!(err.kind, ErrorKind::DisplayHelp);
assert_eq!(
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err.to_string(),
EVERYTHING.replace("{{version}}", env!("CARGO_PKG_VERSION"))
);
}