armybox 0.3.0

A memory-safe #[no_std] BusyBox/Toybox clone in Rust - 299 Unix utilities in ~500KB
Documentation 
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//! Boolean utilities - true, false, colon
//!
//! Simple utilities that return fixed exit codes.

/// true - return true (exit 0)
pub fn r#true(_argc: i32, _argv: *const *const u8) -> i32 { 0 }

/// false - return false (exit 1)
pub fn r#false(_argc: i32, _argv: *const *const u8) -> i32 { 1 }

/// colon - null command (exit 0)
pub fn colon(_argc: i32, _argv: *const *const u8) -> i32 { 0 }

#[cfg(test)]
mod tests {
    extern crate std;
    use std::process::Command;
    use std::path::PathBuf;

    fn get_armybox_path() -> PathBuf {
        if let Ok(path) = std::env::var("ARMYBOX_PATH") {
            return PathBuf::from(path);
        }
        let manifest_dir = std::env::var("CARGO_MANIFEST_DIR")
            .map(PathBuf::from)
            .unwrap_or_else(|_| std::env::current_dir().unwrap());
        let release = manifest_dir.join("target/release/armybox");
        if release.exists() { return release; }
        manifest_dir.join("target/debug/armybox")
    }

    #[test]
    fn test_true_returns_zero() {
        let armybox = get_armybox_path();
        if !armybox.exists() { return; }

        let output = Command::new(&armybox)
            .args(["true"])
            .output()
            .unwrap();

        assert_eq!(output.status.code(), Some(0));
    }

    #[test]
    fn test_false_returns_one() {
        let armybox = get_armybox_path();
        if !armybox.exists() { return; }

        let output = Command::new(&armybox)
            .args(["false"])
            .output()
            .unwrap();

        assert_eq!(output.status.code(), Some(1));
    }
}