structopt 0.2.3

Parse command line argument by defining a struct.
Documentation 
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// Copyright (c) 2018 Guillaume Pinot <texitoi(a)texitoi.eu>
//
// This work is free. You can redistribute it and/or modify it under
// the terms of the Do What The Fuck You Want To Public License,
// Version 2, as published by Sam Hocevar. See the COPYING file for
// more details.

#[macro_use]
extern crate structopt;

use structopt::StructOpt;

#[test]
fn required_option() {
    #[derive(StructOpt, PartialEq, Debug)]
    struct Opt {
        #[structopt(short = "a", long = "arg")]
        arg: i32,
    }
    assert_eq!(Opt { arg: 42 },
               Opt::from_clap(&Opt::clap().get_matches_from(&["test", "-a42"])));
    assert_eq!(Opt { arg: 42 },
               Opt::from_clap(&Opt::clap().get_matches_from(&["test", "-a", "42"])));
    assert_eq!(Opt { arg: 42 },
               Opt::from_clap(&Opt::clap().get_matches_from(&["test", "--arg", "42"])));
    assert!(Opt::clap().get_matches_from_safe(&["test"]).is_err());
    assert!(Opt::clap().get_matches_from_safe(&["test", "-a42", "-a24"]).is_err());
}

#[test]
fn optional_option() {
    #[derive(StructOpt, PartialEq, Debug)]
    struct Opt {
        #[structopt(short = "a")]
        arg: Option<i32>,
    }
    assert_eq!(Opt { arg: Some(42) },
               Opt::from_clap(&Opt::clap().get_matches_from(&["test", "-a42"])));
    assert_eq!(Opt { arg: None },
               Opt::from_clap(&Opt::clap().get_matches_from(&["test"])));
    assert!(Opt::clap().get_matches_from_safe(&["test", "-a42", "-a24"]).is_err());
}

#[test]
fn option_with_default() {
    #[derive(StructOpt, PartialEq, Debug)]
    struct Opt {
        #[structopt(short = "a", default_value = "42")]
        arg: i32,
    }
    assert_eq!(Opt { arg: 24 },
               Opt::from_clap(&Opt::clap().get_matches_from(&["test", "-a24"])));
    assert_eq!(Opt { arg: 42 },
               Opt::from_clap(&Opt::clap().get_matches_from(&["test"])));
    assert!(Opt::clap().get_matches_from_safe(&["test", "-a42", "-a24"]).is_err());
}

#[test]
fn option_with_raw_default() {
    #[derive(StructOpt, PartialEq, Debug)]
    struct Opt {
        #[structopt(short = "a", raw(default_value = r#""42""#))]
        arg: i32,
    }
    assert_eq!(Opt { arg: 24 },
               Opt::from_clap(&Opt::clap().get_matches_from(&["test", "-a24"])));
    assert_eq!(Opt { arg: 42 },
               Opt::from_clap(&Opt::clap().get_matches_from(&["test"])));
    assert!(Opt::clap().get_matches_from_safe(&["test", "-a42", "-a24"]).is_err());
}

#[test]
fn options() {
    #[derive(StructOpt, PartialEq, Debug)]
    struct Opt {
        #[structopt(short = "a", long = "arg")]
        arg: Vec<i32>,
    }
    assert_eq!(Opt { arg: vec![24] },
               Opt::from_clap(&Opt::clap().get_matches_from(&["test", "-a24"])));
    assert_eq!(Opt { arg: vec![] },
               Opt::from_clap(&Opt::clap().get_matches_from(&["test"])));
    assert_eq!(Opt { arg: vec![24, 42] },
               Opt::from_clap(&Opt::clap().get_matches_from(&["test", "-a24", "--arg", "42"])));
}

#[test]
fn empy_default_value() {
    #[derive(StructOpt, PartialEq, Debug)]
    struct Opt {
        #[structopt(short = "a", default_value = "")]
        arg: String,
    }
    assert_eq!(Opt { arg: "".into() }, Opt::from_iter(&["test"]));
    assert_eq!(Opt { arg: "foo".into() }, Opt::from_iter(&["test", "-afoo"]));
}