#[cfg(test)]
mod tests {
    use std::fs::File;
    use std::io::BufReader;

    #[test]
    fn find_matches_test() {
        let mut result = Vec::new();
        let f = File::open("test.txt").expect("could not read file");
        let content = BufReader::new(f);

        grrrrrrs::find_matches(content, "ip", &mut result);
        assert_eq!(result, b"rem ipsum\n");
    }
}