message: Add FIXME to file reading test
diff: @@ -5,6 +5,7 @@ use std::fs::File;
  use std::io::Read;
  fn main() {
  + // FIXME: create the file and delete it when `rm` is implemented.
  let mut file = File::open("./tests/hello.txt").unwrap();
  let mut contents = String::new();
  file.read_to_string(&mut contents).unwrap();
  