clap/tests/arg_enum_case_sensitive.rs

// Copyright 2018 Guillaume Pinot (@TeXitoi) <texitoi@texitoi.eu>,
// Kevin Knapp (@kbknapp) <kbknapp@gmail.com>, and
// Andrew Hobden (@hoverbear) <andrew@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.
#[macro_use]
extern crate clap;

use clap::{App, Arg, ArgEnum};

#[derive(ArgEnum, Debug, PartialEq)]
#[case_sensitive]
enum ArgChoice {
    Foo,
    Bar,
    Baz,
}

#[test]
fn when_lowercase() {
    let matches = App::new(env!("CARGO_PKG_NAME"))
        .arg(
            Arg::with_name("arg")
                .required(true)
                .takes_value(true)
                .possible_values(&ArgChoice::variants()),
        )
        .get_matches_from_safe(vec!["", "foo"]); // We expect this to fail.
    assert!(matches.is_err());
    assert_eq!(matches.unwrap_err().kind, clap::ErrorKind::InvalidValue);
}

#[test]
fn when_capitalized() {
    let matches = App::new(env!("CARGO_PKG_NAME"))
        .arg(
            Arg::with_name("arg")
                .required(true)
                .takes_value(true)
                .possible_values(&ArgChoice::variants()),
        )
        .get_matches_from_safe(vec!["", "Foo"])
        .unwrap();
    let t = value_t!(matches.value_of("arg"), ArgChoice);
    assert!(t.is_ok());
    assert_eq!(t.unwrap(), ArgChoice::Foo);
}