async fn exec<I, S>(args: I) -> Result<String, String>

    where

        I: IntoIterator<Item = S>,

        S: AsRef<OsStr>,

    {

        if Self::is_installed().await {

        }

        return Err("Please install 'protontricks'!".to_string());

    }

    async fn is_installed() -> bool {

        super::exec("protontricks", ["--version"]).await.is_ok()

    }

    async fn version() -> Result<String, String> {

        Self::exec(["--version"]).await

    }

    async fn version_should_return_the_version() {

        assert_eq!(

            Protontricks::version().await.is_ok(),

            !env::var("CI").is_ok()

        );

    }

    async fn is_installed_should_return_false_if_not_installed() {

        assert_eq!(Protontricks::is_installed().await, !env::var("CI").is_ok());

    }