message: Assert the lock files are byte-for-byte equal
diff: @@ -392,6 +392,5 @@ fn preserve_top_comment() {
  let lockfile2 = p.read_file("Cargo.lock");
  println!("loaded Cargo.lock contents:\n{}", lockfile2);
  - let first_line = lockfile2.lines().into_iter().next().unwrap();
  - assert!(first_line == "# @generated");
  + assert!(lockfile == lockfile2);
  }
  