forked from clap-rs/clap
/
arguments.rs
120 lines (109 loc) · 3.35 KB
/
arguments.rs
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// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>,
// Kevin Knapp (@kbknapp) <kbknapp@gmail.com>, and
// Ana Hobden (@hoverbear) <operator@hoverbear.org>
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//
// This work was derived from Structopt (https://github.com/TeXitoi/structopt)
// commit#ea76fa1b1b273e65e3b0b1046643715b49bec51f which is licensed under the
// MIT/Apache 2.0 license.
use clap::CommandFactory;
use clap::Parser;
#[test]
fn required_argument() {
#[derive(Parser, PartialEq, Debug)]
struct Opt {
arg: i32,
}
assert_eq!(
Opt { arg: 42 },
Opt::try_parse_from(&["test", "42"]).unwrap()
);
assert!(Opt::try_parse_from(&["test"]).is_err());
assert!(Opt::try_parse_from(&["test", "42", "24"]).is_err());
}
#[test]
fn argument_with_default() {
#[derive(Parser, PartialEq, Debug)]
struct Opt {
#[clap(default_value = "42")]
arg: i32,
}
assert_eq!(
Opt { arg: 24 },
Opt::try_parse_from(&["test", "24"]).unwrap()
);
assert_eq!(Opt { arg: 42 }, Opt::try_parse_from(&["test"]).unwrap());
assert!(Opt::try_parse_from(&["test", "42", "24"]).is_err());
}
#[test]
fn auto_value_name() {
#[derive(Parser, PartialEq, Debug)]
struct Opt {
my_special_arg: i32,
}
let mut help = Vec::new();
Opt::command().write_help(&mut help).unwrap();
let help = String::from_utf8(help).unwrap();
assert!(help.contains("MY_SPECIAL_ARG"));
// Ensure the implicit `num_vals` is just 1
assert_eq!(
Opt { my_special_arg: 10 },
Opt::try_parse_from(&["test", "10"]).unwrap()
);
}
#[test]
fn explicit_value_name() {
#[derive(Parser, PartialEq, Debug)]
struct Opt {
#[clap(value_name = "BROWNIE_POINTS")]
my_special_arg: i32,
}
let mut help = Vec::new();
Opt::command().write_help(&mut help).unwrap();
let help = String::from_utf8(help).unwrap();
assert!(help.contains("BROWNIE_POINTS"));
assert!(!help.contains("MY_SPECIAL_ARG"));
// Ensure the implicit `num_vals` is just 1
assert_eq!(
Opt { my_special_arg: 10 },
Opt::try_parse_from(&["test", "10"]).unwrap()
);
}
#[test]
fn option_type_is_optional() {
#[derive(Parser, PartialEq, Debug)]
struct Opt {
arg: Option<i32>,
}
assert_eq!(
Opt { arg: Some(42) },
Opt::try_parse_from(&["test", "42"]).unwrap()
);
assert_eq!(Opt { arg: None }, Opt::try_parse_from(&["test"]).unwrap());
assert!(Opt::try_parse_from(&["test", "42", "24"]).is_err());
}
#[test]
fn vec_type_is_multiple_values() {
#[derive(Parser, PartialEq, Debug)]
struct Opt {
arg: Vec<i32>,
}
assert_eq!(
Opt { arg: vec![24] },
Opt::try_parse_from(&["test", "24"]).unwrap()
);
assert_eq!(Opt { arg: vec![] }, Opt::try_parse_from(&["test"]).unwrap());
assert_eq!(
Opt { arg: vec![24, 42] },
Opt::try_parse_from(&["test", "24", "42"]).unwrap()
);
assert_eq!(
clap::ErrorKind::ValueValidation,
Opt::try_parse_from(&["test", "NOPE"]).err().unwrap().kind()
);
}