def test_update_matrix_explosion_down(self): game_display = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT)) arena = Arena() arena.arena_matrix = self.get_default_arena() bomb = Bomb((112, 45), 2, arena) arena._update_matrix_explosion_down(bomb, TileType.FLAME) self.assertEqual(arena.arena_matrix[2][3], TileType.FLAME)