@Test
public void testUpdateArrayColumnValues() {

  String updatedKey = "updatedKey";
  Map<String, Object> previousColumns =
      ImmutableMap.of(
          SHARED_KEY, new byte[] {0x00, 0x01},
          updatedKey, new byte[] {0x02, 0x03});
  Map<String, Object> currentColumns =
      ImmutableMap.of(
          SHARED_KEY, new byte[] {0x00, 0x01},
          updatedKey, new byte[] {0x04, 0x05});
  assertEquals(
      ImmutableSet.of(updatedKey), Mutation.getUpdatedColumns(previousColumns, currentColumns));
}