clap/tests/double_require.rs

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use clap::{App, Arg, ErrorKind};
static HELP: &str = "prog
USAGE:
prog [FLAGS]
FLAGS:
-a
-b
-c
-h, --help Print help information
";
static ONLY_B_ERROR: &str = "error: The following required arguments were not provided:
-c
USAGE:
prog [FLAGS] -c -b
For more information try --help
";
static ONLY_C_ERROR: &str = "error: The following required arguments were not provided:
-b
USAGE:
prog [FLAGS] -b -c
For more information try --help
";
fn app() -> App<'static> {
App::new("prog")
.arg(
Arg::new("a")
.short('a')
.required_unless_present_any(&["b", "c"])
.conflicts_with_all(&["b", "c"]),
)
.arg(
Arg::new("b")
.short('b')
.required_unless_present("a")
.requires("c"),
)
.arg(
Arg::new("c")
.short('c')
.required_unless_present("a")
.requires("b"),
)
}
#[test]
fn valid_cases() {
let res = app().try_get_matches_from(vec!["", "-a"]);
assert!(res.is_ok());
let res = app().clone().try_get_matches_from(vec!["", "-b", "-c"]);
assert!(res.is_ok());
let res = app().try_get_matches_from(vec!["", "-c", "-b"]);
assert!(res.is_ok());
}
#[test]
fn help_text() {
let res = app().try_get_matches_from(vec!["prog", "--help"]);
assert!(res.is_err());
let err = res.unwrap_err();
assert_eq!(err.kind, ErrorKind::DisplayHelp);
println!("{}", err.to_string());
assert_eq!(err.to_string(), HELP);
}
#[test]
fn no_duplicate_error() {
let res = app().try_get_matches_from(vec!["", "-b"]);
assert!(res.is_err());
let err = res.unwrap_err();
assert_eq!(err.kind, ErrorKind::MissingRequiredArgument);
assert_eq!(err.to_string(), ONLY_B_ERROR);
let res = app().try_get_matches_from(vec!["", "-c"]);
assert!(res.is_err());
let err = res.unwrap_err();
assert_eq!(err.kind, ErrorKind::MissingRequiredArgument);
assert_eq!(err.to_string(), ONLY_C_ERROR);
}