source: class PngChunkCodeTest {
  
      @Test
      public void decodes_custom() {
  
target:         PngChunkCode c = PngChunkCode.from(
              'H'<<24 | 'E'<<16 | 'L'<<8 | 'O'
          );
          assertEquals("HELO", c.letters);
          assertEquals(1212501071, c.numeric);
      }
  
  }