clap/tests/author_version_about.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.
//
// This work was derived from Structopt (https://github.com/TeXitoi/structopt)
// commit#ea76fa1b1b273e65e3b0b1046643715b49bec51f which is licensed under the
// MIT/Apache 2.0 license.

#[macro_use]
extern crate clap;

use clap::Clap;

#[test]
fn no_author_version_about() {
    use clap::IntoApp;

    #[derive(Clap, PartialEq, Debug)]
    #[clap(name = "foo", about = "", author = "", version = "")]
    struct Opt {}

    let mut output = Vec::new();
    Opt::into_app().write_long_help(&mut output).unwrap();
    let output = String::from_utf8(output).unwrap();

    assert!(output.starts_with("foo \n\nUSAGE:"));
}

static ENV_HELP: &str = "clap_derive 0.3.0
Guillaume Pinot <texitoi@texitoi.eu>, Kevin K. <kbknapp@gmail.com>, hoverbear <andrew@hoverbear.org>
Parse command line argument by defining a struct, derive crate.

USAGE:
    clap_derive

FLAGS:
    -h, --help       
            Prints help information

    -V, --version    
            Prints version information
";

#[test]
fn use_env() {
    use clap::IntoApp;

    #[derive(Clap, PartialEq, Debug)]
    #[clap()]
    struct Opt {}

    let mut output = Vec::new();
    Opt::into_app().write_long_help(&mut output).unwrap();
    let output = String::from_utf8(output).unwrap();
    assert_eq!(output, ENV_HELP);
}