def test_mem_write_word_at_top_left(self):
        self.mda.mem_write_word(0x0000, 0x0841) # 'A' with intensity.
        self.assertEqual(self.mda.video_ram[0x0000], 0x41)
        self.assertEqual(self.mda.video_ram[0x0001], 0x08)
        self.assertEqual(self.cg.last_blit, (None, (0, 0), 0x41, MDA_BRIGHT_GREEN, MDA_BLACK))