I'd like to propose the addition of implicit conversion from integral numbers (byte, short, int, long) to byte array. The concrete use case is code dealing with bitwise operations, mostly related to cryptography.

My wish is to write something like this:

  @ParameterizedTest
  @ValueSource(ints = {Integer.MIN_VALUE, 0, 0xFF, 0xFFFF, 0xFFFFFF, Integer.MAX_VALUE})
  void test(byte[] byteArray) {
    assertThat(byteArray).hasSize(4);
  }

where I can leverage binary and hexadecimal literals which are automatically converted to a byte array using a ByteBuffer with Big Endian order.

I put together a small poc with a custom argument converter. If the proposal is accepted, I'm happy to raise a PR about it.

Deliverables

• A new implicit conversion from byte / short / int / long to byte[]