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from unittest.mock import Mock
from psygnal.containers import Selection
def test_add_and_remove_from_selection():
selection = Selection()
selection.events._current = Mock()
assert not selection._current
assert not selection
selection.add(1)
selection._current = 1
selection.events._current.emit.assert_called_once()
assert 1 in selection
assert selection._current == 1
selection.remove(1)
assert not selection
def test_update_active_called_on_selection_change():
selection = Selection()
selection._update_active = Mock()
selection.add(1)
selection._update_active.assert_called_once()
def test_active_event_emitted_on_selection_change():
selection = Selection()
selection.events.active = Mock()
assert not selection.active
selection.add(1)
assert selection.active == 1
selection.events.active.emit.assert_called_once()
def test_current_setter():
"""Current event should only emit if value changes."""
selection = Selection()
selection._current = 1
selection.events._current = Mock()
selection._current = 1
selection.events._current.emit.assert_not_called()
selection._current = 2
selection.events._current.emit.assert_called_once()
def test_active_setter():
"""Active setter should make value the only selected item, make it current and
emit the active event."""
selection = Selection()
selection.events.active = Mock()
assert not selection._current
selection.active = 1
assert selection.active == 1
assert selection._current == 1
selection.events.active.emit.assert_called_once()
def test_select_only():
mock = Mock()
selection = Selection([1, 2])
selection.active = 1
assert selection.active == 1
selection.events.items_changed.connect(mock)
selection.select_only(2)
mock.assert_called_once_with((2,), (1,))
assert selection.active == 2
def test_clear():
selection = Selection([1, 2])
selection._current = 2
assert len(selection) == 2
selection.clear(keep_current=True)
assert len(selection) == 0
assert selection._current == 2
selection.clear(keep_current=False)
assert selection._current is None
def test_toggle():
selection = Selection()
selection.symmetric_difference_update = Mock()
selection.toggle(1)
selection.symmetric_difference_update.assert_called_once()
def test_emit_change():
"""emit change is overridden to also update the active value."""
selection = Selection()
selection._update_active = Mock()
selection._emit_change((None,), (None,))
selection._update_active.assert_called_once()
def test_hash():
assert hash(Selection())
def test_replace_selection():
mock = Mock()
selection = Selection([1, 2, 3])
selection.events.items_changed.connect(mock)
selection.replace_selection([3, 4, 5])
mock.assert_called_once_with((4, 5), (1, 2))
assert set(selection) == {3, 4, 5}
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