testcallbacks.py

import datetime as dt
from collections import deque, namedtuple

import numpy as np

from holoviews.core import DynamicMap, NdOverlay
from holoviews.core.options import Store
from holoviews.core.util import pd
from holoviews.element import Points, Polygons, Box, Curve, Table, Rectangles
from holoviews.element.comparison import ComparisonTestCase
from holoviews.streams import (PointDraw, PolyDraw, PolyEdit, BoxEdit,
                               PointerXY, PointerX, PlotReset, Selection1D,
                               RangeXY, PlotSize, CDSStream, SingleTap)
import pyviz_comms as comms

try:
    from bokeh.events import Tap
    from bokeh.io.doc import set_curdoc
    from bokeh.models import Range1d, Plot, ColumnDataSource, Selection, PolyEditTool
    from holoviews.plotting.bokeh.callbacks import (
        Callback, PointDrawCallback, PolyDrawCallback, PolyEditCallback,
        BoxEditCallback, Selection1DCallback, PointerXCallback, TapCallback
    )
    from holoviews.plotting.bokeh.renderer import BokehRenderer
    bokeh_server_renderer = BokehRenderer.instance(mode='server')
    bokeh_renderer = BokehRenderer.instance()
except:
    bokeh_renderer = None
    bokeh_server_renderer = None


class CallbackTestCase(ComparisonTestCase):

    def setUp(self):
        self.previous_backend = Store.current_backend
        Store.current_backend = 'bokeh'
        self.comm_manager = bokeh_renderer.comm_manager
        bokeh_renderer.comm_manager = comms.CommManager

    def tearDown(self):
        Store.current_backend = self.previous_backend
        bokeh_server_renderer.last_plot = None
        bokeh_renderer.last_plot = None
        Callback._callbacks = {}
        bokeh_renderer.comm_manager = self.comm_manager


class TestCallbacks(CallbackTestCase):

    def test_stream_callback(self):
        dmap = DynamicMap(lambda x, y: Points([(x, y)]), kdims=[], streams=[PointerXY()])
        plot = bokeh_server_renderer.get_plot(dmap)
        bokeh_server_renderer(plot)
        set_curdoc(plot.document)
        plot.callbacks[0].on_msg({"x": 0.3, "y": 0.2})
        data = plot.handles['source'].data
        self.assertEqual(data['x'], np.array([0.3]))
        self.assertEqual(data['y'], np.array([0.2]))

    def test_point_stream_callback_clip(self):
        dmap = DynamicMap(lambda x, y: Points([(x, y)]), kdims=[], streams=[PointerXY()])
        plot = bokeh_server_renderer.get_plot(dmap)
        bokeh_server_renderer(plot)
        set_curdoc(plot.document)
        plot.callbacks[0].on_msg({"x": -0.3, "y": 1.2})
        data = plot.handles['source'].data
        self.assertEqual(data['x'], np.array([0]))
        self.assertEqual(data['y'], np.array([1]))

    def test_stream_callback_on_clone(self):
        points = Points([])
        stream = PointerXY(source=points)
        plot = bokeh_server_renderer.get_plot(points.clone())
        bokeh_server_renderer(plot)
        set_curdoc(plot.document)
        plot.callbacks[0].on_msg({"x": 0.8, "y": 0.3})
        self.assertEqual(stream.x, 0.8)
        self.assertEqual(stream.y, 0.3)

    def test_stream_callback_on_unlinked_clone(self):
        points = Points([])
        PointerXY(source=points)
        plot = bokeh_server_renderer.get_plot(points.clone(link=False))
        bokeh_server_renderer(plot)
        self.assertTrue(len(plot.callbacks) == 0)

    def test_stream_callback_with_ids(self):
        dmap = DynamicMap(lambda x, y: Points([(x, y)]), kdims=[], streams=[PointerXY()])
        plot = bokeh_server_renderer.get_plot(dmap)
        bokeh_server_renderer(plot)
        set_curdoc(plot.document)
        model = plot.state
        plot.callbacks[0].on_msg({"x": {'id': model.ref['id'], 'value': 0.5},
                                  "y": {'id': model.ref['id'], 'value': 0.4}})
        data = plot.handles['source'].data
        self.assertEqual(data['x'], np.array([0.5]))
        self.assertEqual(data['y'], np.array([0.4]))

    def test_stream_callback_single_call(self):
        def history_callback(x, history=deque(maxlen=10)):
            history.append(x)
            return Curve(list(history))
        stream = PointerX(x=0)
        dmap = DynamicMap(history_callback, kdims=[], streams=[stream])
        plot = bokeh_server_renderer.get_plot(dmap)
        bokeh_server_renderer(plot)
        set_curdoc(plot.document)
        for i in range(20):
            stream.event(x=i)
        data = plot.handles['source'].data
        self.assertEqual(data['x'], np.arange(10))
        self.assertEqual(data['y'], np.arange(10, 20))

    def test_callback_cleanup(self):
        stream = PointerX(x=0)
        dmap = DynamicMap(lambda x: Curve([x]), streams=[stream])
        plot = bokeh_server_renderer.get_plot(dmap)
        self.assertTrue(bool(stream._subscribers))
        self.assertTrue(bool(Callback._callbacks))
        plot.cleanup()
        self.assertFalse(bool(stream._subscribers))
        self.assertFalse(bool(Callback._callbacks))

    def test_selection1d_syncs_to_selected(self):
        points = Points([(0, 0), (1, 1), (2, 2)]).opts(selected=[0, 2])
        stream = Selection1D(source=points)
        bokeh_renderer.get_plot(points)
        self.assertEqual(stream.index, [0, 2])


class TestResetCallback(CallbackTestCase):

    def test_reset_callback(self):
        resets = []
        def record(resetting):
            resets.append(resetting)
        curve = Curve([])
        stream = PlotReset(source=curve)
        stream.add_subscriber(record)
        plot = bokeh_server_renderer.get_plot(curve)
        plot.callbacks[0].on_msg({'reset': True})
        self.assertEqual(resets, [True])
        self.assertIs(stream.source, curve)



class TestPointerCallbacks(CallbackTestCase):

    def test_pointer_x_datetime_out_of_bounds(self):
        points = Points([(dt.datetime(2017, 1, 1), 1), (dt.datetime(2017, 1, 3), 3)])
        PointerX(source=points)
        plot = bokeh_server_renderer.get_plot(points)
        set_curdoc(plot.document)
        callback = plot.callbacks[0]
        self.assertIsInstance(callback, PointerXCallback)
        msg = callback._process_msg({'x': 1000})
        self.assertEqual(msg['x'], np.datetime64(dt.datetime(2017, 1, 1)))
        msg = callback._process_msg({'x': 10000000000000})
        self.assertEqual(msg['x'], np.datetime64(dt.datetime(2017, 1, 3)))

    def test_tap_datetime_out_of_bounds(self):
        points = Points([(dt.datetime(2017, 1, 1), 1), (dt.datetime(2017, 1, 3), 3)])
        SingleTap(source=points)
        plot = bokeh_server_renderer.get_plot(points)
        set_curdoc(plot.document)
        callback = plot.callbacks[0]
        self.assertIsInstance(callback, TapCallback)
        msg = callback._process_msg({'x': 1000, 'y': 2})
        self.assertEqual(msg, {})
        msg = callback._process_msg({'x': 10000000000000, 'y': 1})
        self.assertEqual(msg, {})



class TestEditToolCallbacks(CallbackTestCase):

    def test_point_draw_callback(self):
        points = Points([(0, 1)])
        point_draw = PointDraw(source=points)
        plot = bokeh_server_renderer.get_plot(points)
        self.assertIsInstance(plot.callbacks[0], PointDrawCallback)
        callback = plot.callbacks[0]
        data = {'x': [1, 2, 3], 'y': [1, 2, 3]}
        callback.on_msg({'data': data})
        self.assertEqual(point_draw.element, Points(data))

    def test_point_draw_callback_initialized_server(self):
        points = Points([(0, 1)])
        PointDraw(source=points)
        plot = bokeh_server_renderer.get_plot(points)
        self.assertEqual(plot.handles['source']._callbacks,
                         {'data': [plot.callbacks[0].on_change]})

    def test_point_draw_callback_initialized_js(self):
        points = Points([(0, 1)])
        PointDraw(source=points)
        plot = bokeh_renderer.get_plot(points)
        cb = plot.callbacks[0].callbacks[0]
        self.assertEqual(plot.handles['source'].js_property_callbacks,
                         {'change:data': [cb], 'patching': [cb]})

    def test_point_draw_callback_with_vdims_initialization(self):
        points = Points([(0, 1, 'A')], vdims=['A'])
        stream = PointDraw(source=points)
        bokeh_server_renderer.get_plot(points)
        self.assertEqual(stream.element.dimension_values('A'), np.array(['A']))
        
    def test_point_draw_callback_with_vdims(self):
        points = Points([(0, 1, 'A')], vdims=['A'])
        point_draw = PointDraw(source=points)
        plot = bokeh_server_renderer.get_plot(points)
        self.assertIsInstance(plot.callbacks[0], PointDrawCallback)
        callback = plot.callbacks[0]
        data = {'x': [1, 2, 3], 'y': [1, 2, 3], 'A': [None, None, 1]}
        callback.on_msg({'data': data})
        processed = dict(data, A=[np.nan, np.nan, 1])
        self.assertEqual(point_draw.element, Points(processed, vdims=['A']))

    def test_poly_draw_callback(self):
        polys = Polygons([[(0, 0), (2, 2), (4, 0)]])
        poly_draw = PolyDraw(source=polys)
        plot = bokeh_server_renderer.get_plot(polys)
        self.assertIsInstance(plot.callbacks[0], PolyDrawCallback)
        callback = plot.callbacks[0]
        data = {'x': [[1, 2, 3], [3, 4, 5]], 'y': [[1, 2, 3], [3, 4, 5]]}
        callback.on_msg({'data': data})
        element = Polygons([[(1, 1), (2, 2), (3, 3)], [(3, 3), (4, 4), (5, 5)]])
        self.assertEqual(poly_draw.element, element)

    def test_poly_draw_callback_initialized_server(self):
        polys = Polygons([[(0, 0), (2, 2), (4, 0)]])
        PolyDraw(source=polys)
        plot = bokeh_server_renderer.get_plot(polys)
        self.assertEqual(plot.handles['source']._callbacks,
                         {'data': [plot.callbacks[0].on_change]})

    def test_poly_draw_callback_initialized_js(self):
        polys = Polygons([[(0, 0), (2, 2), (4, 0)]])
        PolyDraw(source=polys)
        plot = bokeh_renderer.get_plot(polys)
        cb = plot.callbacks[0].callbacks[0]
        self.assertEqual(plot.handles['source'].js_property_callbacks,
                         {'change:data': [cb], 'patching': [cb]})

    def test_poly_draw_callback_with_vdims(self):
        polys = Polygons([{'x': [0, 2, 4], 'y': [0, 2, 0], 'A': 1}], vdims=['A'])
        poly_draw = PolyDraw(source=polys)
        plot = bokeh_server_renderer.get_plot(polys)
        self.assertIsInstance(plot.callbacks[0], PolyDrawCallback)
        callback = plot.callbacks[0]
        data = {'x': [[1, 2, 3], [3, 4, 5]], 'y': [[1, 2, 3], [3, 4, 5]], 'A': [1, 2]}
        callback.on_msg({'data': data})
        element = Polygons([{'x': [1, 2, 3], 'y': [1, 2, 3], 'A': 1},
                            {'x': [3, 4, 5], 'y': [3, 4, 5], 'A': 2}], vdims=['A'])
        self.assertEqual(poly_draw.element, element)

    def test_poly_draw_callback_with_vdims_no_color_index(self):
        polys = Polygons([{'x': [0, 2, 4], 'y': [0, 2, 0], 'A': 1}], vdims=['A']).options(color_index=None)
        poly_draw = PolyDraw(source=polys)
        plot = bokeh_server_renderer.get_plot(polys)
        self.assertIsInstance(plot.callbacks[0], PolyDrawCallback)
        callback = plot.callbacks[0]
        data = {'x': [[1, 2, 3], [3, 4, 5]], 'y': [[1, 2, 3], [3, 4, 5]], 'A': [1, 2]}
        callback.on_msg({'data': data})
        element = Polygons([{'x': [1, 2, 3], 'y': [1, 2, 3], 'A': 1},
                            {'x': [3, 4, 5], 'y': [3, 4, 5], 'A': 2}], vdims=['A'])
        self.assertEqual(poly_draw.element, element)

    def test_box_edit_callback(self):
        boxes = Rectangles([(-0.5, -0.5, 0.5, 0.5)])
        box_edit = BoxEdit(source=boxes)
        plot = bokeh_server_renderer.get_plot(boxes)
        self.assertIsInstance(plot.callbacks[0], BoxEditCallback)
        callback = plot.callbacks[0]
        source = plot.handles['cds']
        self.assertEqual(source.data['x'], [0])
        self.assertEqual(source.data['y'], [0])
        self.assertEqual(source.data['width'], [1])
        self.assertEqual(source.data['height'], [1])
        data = {'x': [0, 1], 'y': [0, 1], 'width': [0.5, 2], 'height': [2, 0.5]}
        callback.on_msg({'data': data})
        element = Rectangles([(-0.25, -1, 0.25, 1), (0, 0.75, 2, 1.25)])
        self.assertEqual(box_edit.element, element)

    def test_box_edit_callback_legacy(self):
        boxes = Polygons([Box(0, 0, 1)])
        box_edit = BoxEdit(source=boxes)
        plot = bokeh_server_renderer.get_plot(boxes)
        self.assertIsInstance(plot.callbacks[0], BoxEditCallback)
        callback = plot.callbacks[0]
        source = plot.handles['cds']
        self.assertEqual(source.data['x'], [0])
        self.assertEqual(source.data['y'], [0])
        self.assertEqual(source.data['width'], [1])
        self.assertEqual(source.data['height'], [1])
        data = {'x': [0, 1], 'y': [0, 1], 'width': [0.5, 2], 'height': [2, 0.5]}
        callback.on_msg({'data': data})
        element = Polygons([Box(0, 0, (0.5, 2)), Box(1, 1, (2, 0.5))])
        self.assertEqual(box_edit.element, element)

    def test_box_edit_callback_initialized_server(self):
        boxes = Polygons([Box(0, 0, 1)])
        BoxEdit(source=boxes)
        plot = bokeh_server_renderer.get_plot(boxes)
        self.assertEqual(plot.handles['cds']._callbacks,
                         {'data': [plot.callbacks[0].on_change]})

    def test_box_edit_callback_initialized_js(self):
        boxes = Polygons([Box(0, 0, 1)])
        BoxEdit(source=boxes)
        plot = bokeh_renderer.get_plot(boxes)
        cb = plot.callbacks[0].callbacks[0]
        self.assertEqual(plot.handles['cds'].js_property_callbacks,
                         {'change:data': [cb], 'patching': [cb]})

    def test_poly_edit_callback(self):
        polys = Polygons([[(0, 0), (2, 2), (4, 0)]])
        poly_edit = PolyEdit(source=polys)
        plot = bokeh_server_renderer.get_plot(polys)
        self.assertIsInstance(plot.callbacks[0], PolyEditCallback)
        callback = plot.callbacks[0]
        data = {'x': [[1, 2, 3], [3, 4, 5]], 'y': [[1, 2, 3], [3, 4, 5]]}
        callback.on_msg({'data': data})
        element = Polygons([[(1, 1), (2, 2), (3, 3)], [(3, 3), (4, 4), (5, 5)]])
        self.assertEqual(poly_edit.element, element)

    def test_poly_edit_callback_initialized_server(self):
        polys = Polygons([[(0, 0), (2, 2), (4, 0)]])
        PolyEdit(source=polys)
        plot = bokeh_server_renderer.get_plot(polys)
        self.assertEqual(plot.handles['source']._callbacks,
                         {'data': [plot.callbacks[0].on_change]})

    def test_poly_edit_callback_initialized_js(self):
        polys = Polygons([[(0, 0), (2, 2), (4, 0)]])
        PolyEdit(source=polys)
        plot = bokeh_renderer.get_plot(polys)
        cb = plot.callbacks[0].callbacks[0]
        self.assertEqual(plot.handles['source'].js_property_callbacks,
                         {'change:data': [cb], 'patching': [cb]})

    def test_poly_edit_shared_callback(self):
        polys = Polygons([[(0, 0), (2, 2), (4, 0)]])
        polys2 = Polygons([[(0, 0), (2, 2), (4, 0)]])
        poly_edit = PolyEdit(source=polys, shared=True)
        poly_edit2 = PolyEdit(source=polys2, shared=True)
        plot = bokeh_server_renderer.get_plot(polys*polys2)
        edit_tools = [t for t in plot.state.tools if isinstance(t, PolyEditTool)]
        self.assertEqual(len(edit_tools), 1)
        plot1, plot2 = plot.subplots.values()
        self.assertIsInstance(plot1.callbacks[0], PolyEditCallback)
        callback = plot1.callbacks[0]
        data = {'x': [[1, 2, 3], [3, 4, 5]], 'y': [[1, 2, 3], [3, 4, 5]]}
        callback.on_msg({'data': data})
        self.assertIsInstance(plot2.callbacks[0], PolyEditCallback)
        callback = plot2.callbacks[0]
        data = {'x': [[1, 2, 3], [3, 4, 5]], 'y': [[1, 2, 3], [3, 4, 5]]}
        callback.on_msg({'data': data})
        element = Polygons([[(1, 1), (2, 2), (3, 3)], [(3, 3), (4, 4), (5, 5)]])
        self.assertEqual(poly_edit.element, element)
        self.assertEqual(poly_edit2.element, element)

    def test_point_draw_shared_datasource_callback(self):
        points = Points([1, 2, 3])
        table = Table(points.data, ['x', 'y'])
        layout = (points + table).options(shared_datasource=True, clone=False)
        PointDraw(source=points)
        self.assertIs(points.data, table.data)
        plot = bokeh_renderer.get_plot(layout)
        point_plot = plot.subplots[(0, 0)].subplots['main']
        table_plot = plot.subplots[(0, 1)].subplots['main']
        self.assertIs(point_plot.handles['source'], table_plot.handles['source'])
        self.assertIn(plot.id, point_plot.callbacks[0].callbacks[0].code)
        self.assertNotIn('PLACEHOLDER_PLOT_ID', point_plot.callbacks[0].callbacks[0].code)



class TestServerCallbacks(CallbackTestCase):

    def test_server_callback_resolve_attr_spec_range1d_start(self):
        range1d = Range1d(start=0, end=10)
        msg = Callback.resolve_attr_spec('x_range.attributes.start', range1d)
        self.assertEqual(msg, {'id': range1d.ref['id'], 'value': 0})

    def test_server_callback_resolve_attr_spec_range1d_end(self):
        range1d = Range1d(start=0, end=10)
        msg = Callback.resolve_attr_spec('x_range.attributes.end', range1d)
        self.assertEqual(msg, {'id': range1d.ref['id'], 'value': 10})

    def test_server_callback_resolve_attr_spec_source_selected(self):
        source = ColumnDataSource()
        source.selected.indices = [1, 2, 3]
        msg = Callback.resolve_attr_spec('cb_obj.selected.indices', source)
        self.assertEqual(msg, {'id': source.ref['id'], 'value': [1, 2, 3]})

    def test_server_callback_resolve_attr_spec_tap_event(self):
        plot = Plot()
        event = Tap(plot, x=42)
        msg = Callback.resolve_attr_spec('cb_obj.x', event, plot)
        self.assertEqual(msg, {'id': plot.ref['id'], 'value': 42})

    def test_selection1d_resolves(self):
        points = Points([1, 2, 3])
        Selection1D(source=points)
        plot = bokeh_server_renderer.get_plot(points)
        selected = Selection(indices=[0, 2])
        callback = plot.callbacks[0]
        spec = callback.attributes['index']
        resolved = callback.resolve_attr_spec(spec, selected, model=selected)
        self.assertEqual(resolved, {'id': selected.ref['id'], 'value': [0, 2]})

    def test_selection1d_resolves_table(self):
        table = Table([1, 2, 3], 'x')
        Selection1D(source=table)
        plot = bokeh_server_renderer.get_plot(table)
        selected = Selection(indices=[0, 2])
        callback = plot.callbacks[0]
        spec = callback.attributes['index']
        resolved = callback.resolve_attr_spec(spec, selected, model=selected)
        self.assertEqual(resolved, {'id': selected.ref['id'], 'value': [0, 2]})

    def test_rangexy_resolves(self):
        points = Points([1, 2, 3])
        RangeXY(source=points)
        plot = bokeh_server_renderer.get_plot(points)
        x_range = plot.handles['x_range']
        y_range = plot.handles['y_range']
        callback = plot.callbacks[0]
        x0_range_spec = callback.attributes['x0']
        x1_range_spec = callback.attributes['x1']
        y0_range_spec = callback.attributes['y0']
        y1_range_spec = callback.attributes['y1']
        resolved = callback.resolve_attr_spec(x0_range_spec, x_range, model=x_range)
        self.assertEqual(resolved, {'id': x_range.ref['id'], 'value': 0})
        resolved = callback.resolve_attr_spec(x1_range_spec, x_range, model=x_range)
        self.assertEqual(resolved, {'id': x_range.ref['id'], 'value': 2})
        resolved = callback.resolve_attr_spec(y0_range_spec, y_range, model=y_range)
        self.assertEqual(resolved, {'id': y_range.ref['id'], 'value': 1})
        resolved = callback.resolve_attr_spec(y1_range_spec, y_range, model=y_range)
        self.assertEqual(resolved, {'id': y_range.ref['id'], 'value': 3})

    def test_plotsize_resolves(self):
        points = Points([1, 2, 3])
        PlotSize(source=points)
        plot = bokeh_server_renderer.get_plot(points)
        callback = plot.callbacks[0]
        model = namedtuple('Plot', 'inner_width inner_height ref')(400, 300, {'id': 'Test'})
        width_spec = callback.attributes['width']
        height_spec = callback.attributes['height']
        resolved = callback.resolve_attr_spec(width_spec, model, model=model)
        self.assertEqual(resolved, {'id': 'Test', 'value': 400})
        resolved = callback.resolve_attr_spec(height_spec, model, model=model)
        self.assertEqual(resolved, {'id': 'Test', 'value': 300})

    def test_cds_resolves(self):
        points = Points([1, 2, 3])
        CDSStream(source=points)
        plot = bokeh_server_renderer.get_plot(points)
        cds = plot.handles['cds']
        callback = plot.callbacks[0]
        data_spec = callback.attributes['data']
        resolved = callback.resolve_attr_spec(data_spec, cds, model=cds)
        self.assertEqual(resolved, {'id': cds.ref['id'],
                                    'value': points.columns()})

    def test_rangexy_datetime(self):
        curve = Curve(pd.util.testing.makeTimeDataFrame(), 'index', 'C')
        stream = RangeXY(source=curve)
        plot = bokeh_server_renderer.get_plot(curve)
        callback = plot.callbacks[0]
        callback.on_msg({"x0": curve.iloc[0, 0], 'x1': curve.iloc[3, 0],
                         "y0": 0.2, 'y1': 0.8})
        self.assertEqual(stream.x_range[0], curve.iloc[0, 0])
        self.assertEqual(stream.x_range[1], curve.iloc[3, 0])
        self.assertEqual(stream.y_range, (0.2, 0.8))

    def test_rangexy_framewise_reset(self):
        stream = RangeXY(x_range=(0, 2), y_range=(0, 1))
        curve = DynamicMap(lambda z, x_range, y_range: Curve([1, 2, z]),
                           kdims=['z'], streams=[stream]).redim.range(z=(0, 3))
        plot = bokeh_server_renderer.get_plot(curve.opts(framewise=True))
        plot.update((1,))
        self.assertEqual(stream.y_range, None)

    def test_rangexy_framewise_not_reset_if_triggering(self):
        stream = RangeXY(x_range=(0, 2), y_range=(0, 1))
        curve = DynamicMap(lambda z, x_range, y_range: Curve([1, 2, z]),
                           kdims=['z'], streams=[stream]).redim.range(z=(0, 3))
        bokeh_server_renderer.get_plot(curve.opts(framewise=True
        ))
        stream.event(x_range=(0, 3))
        self.assertEqual(stream.x_range, (0, 3))



class TestBokehCustomJSCallbacks(CallbackTestCase):

    def test_customjs_callback_attributes_js_for_model(self):
        js_code = Callback.attributes_js({'x0': 'x_range.attributes.start',
                                          'x1': 'x_range.attributes.end'})

        code = (
            'if ((x_range != undefined)) { data["x0"] = {id: x_range["id"], value: '
            'x_range["attributes"]["start"]};\n }'
            'if ((x_range != undefined)) { data["x1"] = {id: x_range["id"], value: '
            'x_range["attributes"]["end"]};\n }'
        )
        self.assertEqual(js_code, code)

    def test_customjs_callback_attributes_js_for_cb_obj(self):
        js_code = Callback.attributes_js({'x': 'cb_obj.x',
                                          'y': 'cb_obj.y'})
        code = 'data["x"] = cb_obj["x"];\ndata["y"] = cb_obj["y"];\n'
        self.assertEqual(js_code, code)

    def test_customjs_callback_attributes_js_for_cb_data(self):
        js_code = Callback.attributes_js({'x0': 'cb_data.geometry.x0',
                                          'x1': 'cb_data.geometry.x1',
                                          'y0': 'cb_data.geometry.y0',
                                          'y1': 'cb_data.geometry.y1'})
        code = ('data["x0"] = cb_data["geometry"]["x0"];\n'
                'data["x1"] = cb_data["geometry"]["x1"];\n'
                'data["y0"] = cb_data["geometry"]["y0"];\n'
                'data["y1"] = cb_data["geometry"]["y1"];\n')
        self.assertEqual(js_code, code)

    def test_callback_on_ndoverlay_is_attached(self):
        ndoverlay = NdOverlay({i: Curve([i]) for i in range(5)})
        selection = Selection1D(source=ndoverlay)
        plot = bokeh_renderer.get_plot(ndoverlay)
        self.assertEqual(len(plot.callbacks), 1)
        self.assertIsInstance(plot.callbacks[0], Selection1DCallback)
        self.assertIn(selection, plot.callbacks[0].streams)

    def test_callback_on_table_is_attached(self):
        table = Table([1, 2, 3], 'x')
        selection = Selection1D(source=table)
        plot = bokeh_renderer.get_plot(table)
        self.assertEqual(len(plot.callbacks), 1)
        self.assertIsInstance(plot.callbacks[0], Selection1DCallback)
        self.assertIn(selection, plot.callbacks[0].streams)
        callbacks = plot.handles['selected'].js_property_callbacks
        self.assertIn('change:indices', callbacks)
        self.assertIn(plot.id, callbacks['change:indices'][0].code)