def test_widget_link_target_param_not_found():
t1 = TextInput()
t2 = TextInput()
with pytest.raises(ValueError) as excinfo:
t1.jslink(t2, value='value1')
assert "Could not jslink \'value1\' parameter" in str(excinfo)
def test_widget_link_no_target_transform_error():
t1 = DatetimeInput()
t2 = TextInput()
with pytest.raises(ValueError) as excinfo:
t2.jslink(t1, value='value')
assert ("Cannot jslink \'value\' parameter on TextInput object "
"to \'value\' parameter on DatetimeInput object") in str(excinfo)
def test_widget_link_bidirectional(document, comm):
t1 = TextInput()
t2 = TextInput()
t1.jslink(t2, value='value', bidirectional=True)
row = Row(t1, t2)
model = row.get_root(document, comm)
tm1, tm2 = model.children
link1_customjs = tm1.js_property_callbacks['change:value'][-1]
link2_customjs = tm2.js_property_callbacks['change:value'][-1]
assert link1_customjs.args['source'] is tm1
assert link2_customjs.args['source'] is tm2
assert link1_customjs.args['target'] is tm2
assert link2_customjs.args['target'] is tm1
