//! ```
//! let contents = include_str!(concat!(env!("OUT_DIR"), "/test_content.txt"));
//! assert_eq!("Test content", contents);
//! ```

#[cfg(test)]
mod tests {
    use std::env;

    #[test]
    fn can_find_the_out_dir_file() {
        // The file contents must be included via a macro.
        let contents = include_str!(concat!(env!("OUT_DIR"), "/test_content.txt"));
        assert_eq!("Test content", contents);
    }

    #[test]
    fn no_out_dir_at_runtime() {
        // Cargo seems to set this at runtime as well, although the documentation
        // says it's only available at compile time.
        assert!(env::var("OUT_DIR").is_err());
    }
}