def test_read_grid():
# display = Display(visible=0)
# display.start()
browser = Browser()
grid = browser.read_grid()
browser.finish()
nb_zero = sum([row.count(0) for row in grid])
assert_equals(nb_zero, 14)
def test_press_key_down():
browser = Browser()
grid_orig = browser.read_grid()
browser.press_key(Keys.DOWN)
grid = browser.read_grid()
browser.finish()
grid_ref = create_new_grid_with_move(grid_orig, Keys.DOWN)
assert_at_most_one_different_element(grid_ref, grid)