svoid test_Image2BAsLongs() {
  repeat 1000 {
    int w = random_incl(1, 32);
    int h = random_incl(1, 32);
    Image2B image = randomBinaryImage(w, h);
    Image2BAsLongs image2 = new(image);
    assertSameImage(image, image2);
  }
}

Began life as a copy of #1036037