message: Add test for PPM comment handling
diff: @@ -92,4 +92,16 @@ mod test {
  }
  }
  }
  +
  + #[test]
  + fn test_ppm_comment() {
  + // the following is a 1x1 white dot:
  + let buf = "P3\n# asdf\n1 1\n255 255 255 255".as_bytes();
  +
  + let img = super::PPMDecoder::new(&buf[..]);
  + assert_eq!(img.is_ok(), true);
  +
  + let img = img.unwrap().read_image();
  + assert_eq!(img.is_ok(), true);
  + }
  }
  