@Test
    public void shouldDecomposeInto3Colours() {
        DecomposedPixelArray pixels = editor.decomposeRGB();
        assertTrue(pixels.red[0] == 255
                    || pixels.red[10] == 255
                    || pixels.green[0] == 255
                    || pixels.green[10] == 255
                    || pixels.blue[0] == 255
                    || pixels.blue[10] == 255);
    }