def test_link_focus_no_loopback():
focusables = [FocusButton() for _ in range(10)]
link_focus(focusables)
for i, widget in enumerate(focusables):
if i > 0:
assert widget.focus_previous is focusables[i - 1]
if i < len(focusables) - 1:
assert widget.focus_next is focusables[i + 1]
assert focusables[0].focus_previous is None
assert focusables[-1].focus_next is None
def test_link_one_loopback():
btn = FocusButton()
focusables = [btn]
link_focus(focusables, loopback=True)
assert btn.focus_previous is None
assert btn.focus_next is None
def test_link_one():
btn = FocusButton()
focusables = [btn]
link_focus(focusables)
assert btn.focus_previous is None
assert btn.focus_next is None
def test_link_empty():
focusables = []
link_focus(focusables)
assert focusables == []
def test_link_focus_loopback():
focusables = [FocusButton() for _ in range(10)]
link_focus(focusables, loopback=True)
for i, widget in enumerate(focusables):
assert widget.focus_previous is focusables[(i - 1) % len(focusables)]
assert widget.focus_next is focusables[(i + 1) % len(focusables)]