def test_selection():
# test instantiation of selections
interval = alt.selection_interval(name="selec_1")
assert interval.param.select.type == "interval"
assert interval.name == "selec_1"
single = alt.selection_single(name="selec_2")
assert single.param.select.type == "point"
assert single.name == "selec_2"
multi = alt.selection_multi(name="selec_3")
assert multi.param.select.type == "point"
assert multi.name == "selec_3"
# test adding to chart
chart = alt.Chart().add_selection(single)
chart = chart.add_selection(multi, interval)
assert set(x.name
for x in chart.params) == {"selec_1", "selec_2", "selec_3"}
# test logical operations
assert isinstance(single & multi, alt.SelectionPredicateComposition)
assert isinstance(single | multi, alt.SelectionPredicateComposition)
assert isinstance(~single, alt.SelectionPredicateComposition)
assert "and" in (single & multi).to_dict().keys()
assert "or" in (single | multi).to_dict().keys()
assert "not" in (~single).to_dict().keys()
# 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_compound_add_selections(charttype):
base = alt.Chart("data.csv").mark_point()
selection = alt.selection_single()
chart1 = charttype(base.add_selection(selection),
base.add_selection(selection))
chart2 = charttype(base, base).add_selection(selection)
assert chart1.to_dict() == chart2.to_dict()
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.param for s in selections]
assert chart.params == expected
def test_selection_expression():
selection = alt.selection_single(fields=["value"])
assert isinstance(selection.value, alt.SelectionExpression)
assert selection.value.to_dict() == {"expr": f"{selection.name}.value"}
assert isinstance(selection["value"], alt.expr.Expression)
assert selection["value"].to_dict() == "{0}['value']".format(
selection.name)
with pytest.raises(AttributeError):
selection.__magic__
def test_layer_add_selection():
base = alt.Chart("data.csv").mark_point()
selection = alt.selection_single()
chart1 = alt.layer(base.add_selection(selection), base)
chart2 = alt.layer(base, base).add_selection(selection)
assert chart1.to_dict() == chart2.to_dict()
def test_facet_add_selections():
base = alt.Chart("data.csv").mark_point()
selection = alt.selection_single()
chart1 = base.add_selection(selection).facet("val:Q")
chart2 = base.facet("val:Q").add_selection(selection)
assert chart1.to_dict() == chart2.to_dict()
def test_repeat_add_selections():
base = alt.Chart("data.csv").mark_point()
selection = alt.selection_single()
chart1 = base.add_selection(selection).repeat(list("ABC"))
chart2 = base.repeat(list("ABC")).add_selection(selection)
assert chart1.to_dict() == chart2.to_dict()