clap/tests/default_missing_vals.rs

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

#[test]
fn opt_missing() {
    let r = App::new("df")
        .arg(
            Arg::new("color")
                .long("color")
                .default_value("auto")
                .min_values(0)
                .require_equals(true)
                .default_missing_value("always"),
        )
        .try_get_matches_from(vec![""]);
    assert!(r.is_ok());
    let m = r.unwrap();
    assert!(m.is_present("color"));
    assert_eq!(m.value_of("color").unwrap(), "auto");
    assert_eq!(m.occurrences_of("color"), 0);
}

#[test]
fn opt_present_with_missing_value() {
    let r = App::new("df")
        .arg(
            Arg::new("color")
                .long("color")
                .default_value("auto")
                .min_values(0)
                .require_equals(true)
                .default_missing_value("always"),
        )
        .try_get_matches_from(vec!["", "--color"]);
    assert!(r.is_ok());
    let m = r.unwrap();
    assert!(m.is_present("color"));
    assert_eq!(m.value_of("color").unwrap(), "always");
    assert_eq!(m.occurrences_of("color"), 1);
}

#[test]
fn opt_present_with_value() {
    let r = App::new("df")
        .arg(
            Arg::new("color")
                .long("color")
                .default_value("auto")
                .min_values(0)
                .require_equals(true)
                .default_missing_value("always"),
        )
        .try_get_matches_from(vec!["", "--color=never"]);
    assert!(r.is_ok());
    let m = r.unwrap();
    assert!(m.is_present("color"));
    assert_eq!(m.value_of("color").unwrap(), "never");
    assert_eq!(m.occurrences_of("color"), 1);
}

#[test]
fn opt_present_with_empty_value() {
    let r = App::new("df")
        .arg(
            Arg::new("color")
                .long("color")
                .default_value("auto")
                .require_equals(true)
                .default_missing_value("always"),
        )
        .try_get_matches_from(vec!["", "--color="]);
    assert!(r.is_ok());
    let m = r.unwrap();
    assert!(m.is_present("color"));
    assert_eq!(m.value_of("color").unwrap(), "");
    assert_eq!(m.occurrences_of("color"), 1);
}

//## `default_value`/`default_missing_value` non-interaction checks

#[test]
fn opt_default() {
    // assert no change to usual argument handling when adding default_missing_value()
    let r = App::new("app")
        .arg(
            Arg::from_usage("-o [opt] 'some opt'")
                .default_value("default")
                .default_missing_value("default_missing"),
        )
        .try_get_matches_from(vec![""]);
    assert!(r.is_ok());
    let m = r.unwrap();
    assert!(m.is_present("o"));
    assert_eq!(m.value_of("o").unwrap(), "default");
}

#[test]
fn opt_default_user_override() {
    // assert no change to usual argument handling when adding default_missing_value()
    let r = App::new("app")
        .arg(
            Arg::from_usage("-o [opt] 'some opt'")
                .default_value("default")
                .default_missing_value("default_missing"),
        )
        .try_get_matches_from(vec!["", "-o=value"]);
    assert!(r.is_ok());
    let m = r.unwrap();
    assert!(m.is_present("o"));
    assert_eq!(m.value_of("o").unwrap(), "value");
}

#[test]
#[allow(clippy::bool_assert_comparison)]
fn default_missing_value_flag_value() {
    let app = App::new("test").arg(
        Arg::new("flag")
            .long("flag")
            .takes_value(true)
            .default_missing_value("true"),
    );

    fn flag_value(m: ArgMatches) -> bool {
        match m.value_of("flag") {
            None => false,
            Some(x) => x.parse().expect("non boolean value"),
        }
    }

    assert_eq!(flag_value(app.clone().get_matches_from(&["test"])), false);
    assert_eq!(
        flag_value(app.clone().get_matches_from(&["test", "--flag"])),
        true
    );
    assert_eq!(
        flag_value(app.clone().get_matches_from(&["test", "--flag=true"])),
        true
    );
    assert_eq!(
        flag_value(app.clone().get_matches_from(&["test", "--flag=false"])),
        false
    );
}