def test_mem_write_word_at_bottom_right_just_past(self):
        self.mda.mem_write_word(3999, 0xFF08) # 'Z' with intensity.
        self.assertEqual(self.mda.video_ram[3998], 0x00) # Should be unmodified.
        self.assertEqual(self.mda.video_ram[3999], 0x08)
        self.assertEqual(self.cg.last_blit, (None, (711, 336), 0x00, MDA_BRIGHT_GREEN, MDA_BLACK))