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_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_selection_expression():
selection = alt.selection_single(fields=['value'])
assert isinstance(selection.value, alt.expr.Expression)
assert selection.value.to_dict() == '{0}.value'.format(selection.name)
assert isinstance(selection['value'], alt.expr.Expression)
assert selection['value'].to_dict() == "{0}['value']".format(selection.name)
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
def test_selection_expression():
selection = alt.selection_single(fields=["value"])
assert isinstance(selection.value, alt.expr.Expression)
assert selection.value.to_dict() == "{0}.value".format(selection.name)
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()
