def test_selection():
# test instantiation of selections
interval = alt.selection_interval(name="selec_1")
assert interval.selection.type == "interval"
assert interval.name == "selec_1"
single = alt.selection_single(name="selec_2")
assert single.selection.type == "single"
assert single.name == "selec_2"
multi = alt.selection_multi(name="selec_3")
assert multi.selection.type == "multi"
assert multi.name == "selec_3"
# test adding to chart
chart = alt.Chart().add_selection(single)
chart = chart.add_selection(multi, interval)
assert set(chart.selection.keys()) == {"selec_1", "selec_2", "selec_3"}
# test logical operations
assert isinstance(single & multi, alt.Selection)
assert isinstance(single | multi, alt.Selection)
assert isinstance(~single, alt.Selection)
assert isinstance((single & multi)[0].group, alt.SelectionAnd)
assert isinstance((single | multi)[0].group, alt.SelectionOr)
assert isinstance((~single)[0].group, alt.SelectionNot)
# test that default names increment (regression for #1454)
sel1 = alt.selection_single()
sel2 = alt.selection_multi()
sel3 = alt.selection_interval()
names = {s.name for s in (sel1, sel2, sel3)}
assert len(names) == 3
def test_add_selection():
selections = [
alt.selection_interval(),
alt.selection_single(),
alt.selection_multi(),
]
chart = (alt.Chart().mark_point().add_selection(
selections[0]).add_selection(selections[1], selections[2]))
expected = {s.name: s.selection for s in selections}
assert chart.selection == expected
