message: add test for operations(6, 6)
diff: @@ -625,6 +625,22 @@ fn operations_test() {
  }
  ]
  );
  +
  + assert_eq!(
  + operations(6, 6).unwrap(),
  + vec![
  + Op {
  + mask: 3,
  + shiftl: 4,
  + shiftr: 0,
  + },
  + Op {
  + mask: 240,
  + shiftl: 0,
  + shiftr: 4,
  + }
  + ]
  + );
  }
  /// Mask `bits` bits of a byte. eg. mask_high_bits(2) == 0b00000011
  