forked from clap-rs/clap
/
default_value.rs
83 lines (71 loc) · 2.11 KB
/
default_value.rs
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use std::path::PathBuf;
use clap::{CommandFactory, Parser};
use crate::utils;
#[test]
fn default_value() {
#[derive(Parser, PartialEq, Debug)]
struct Opt {
#[clap(value_parser, default_value = "3")]
arg: i32,
}
assert_eq!(Opt { arg: 3 }, Opt::try_parse_from(&["test"]).unwrap());
assert_eq!(Opt { arg: 1 }, Opt::try_parse_from(&["test", "1"]).unwrap());
let help = utils::get_long_help::<Opt>();
assert!(help.contains("[default: 3]"));
}
#[test]
fn default_value_t() {
#[derive(Parser, PartialEq, Debug)]
struct Opt {
#[clap(value_parser, default_value_t = 3)]
arg: i32,
}
assert_eq!(Opt { arg: 3 }, Opt::try_parse_from(&["test"]).unwrap());
assert_eq!(Opt { arg: 1 }, Opt::try_parse_from(&["test", "1"]).unwrap());
let help = utils::get_long_help::<Opt>();
assert!(help.contains("[default: 3]"));
}
#[test]
fn auto_default_value_t() {
#[derive(Parser, PartialEq, Debug)]
struct Opt {
#[clap(value_parser, default_value_t)]
arg: i32,
}
assert_eq!(Opt { arg: 0 }, Opt::try_parse_from(&["test"]).unwrap());
assert_eq!(Opt { arg: 1 }, Opt::try_parse_from(&["test", "1"]).unwrap());
let help = utils::get_long_help::<Opt>();
assert!(help.contains("[default: 0]"));
}
#[test]
fn default_value_os_t() {
#[derive(Parser, PartialEq, Debug)]
struct Opt {
#[clap(value_parser, default_value_os_t = PathBuf::from("abc.def"))]
arg: PathBuf,
}
assert_eq!(
Opt {
arg: PathBuf::from("abc.def")
},
Opt::try_parse_from(&["test"]).unwrap()
);
assert_eq!(
Opt {
arg: PathBuf::from("ghi")
},
Opt::try_parse_from(&["test", "ghi"]).unwrap()
);
let help = utils::get_long_help::<Opt>();
assert!(help.contains("[default: abc.def]"));
}
#[test]
fn detect_os_variant() {
#![allow(unused_parens)] // needed for `as_ref` call
#[derive(clap::Parser)]
pub struct Options {
#[clap(value_parser, default_value_os = ("123".as_ref()))]
x: String,
}
Options::command().debug_assert();
}