svoid assertSameSize(BufferedImage a, BufferedImage b) {
  assertEquals(a.getWidth(), b.getWidth());
  assertEquals(a.getHeight(), b.getHeight());
}

svoid assertSameSize(WidthAndHeight a, WidthAndHeight b) {
  assertEquals(a.getWidth(), b.getWidth());
  assertEquals(a.getHeight(), b.getHeight());
}