def test_screen_refresh():
"""
Test if a Screen object get the refresh of its panel if not set
"""
s = Screen(refresh=-1)
assert s.refresh == -1
s.refresh = 1
assert s.refresh == 1
p = Panel(refresh=2, keep_unplugged_screens=True)
s.refresh = -1
s.panel = p
assert s.refresh == p.refresh
assert s.refresh == 2