Added tests for bokeh Callbacks

tests/testbokehcallbacks.py

@@ -0,0 +1,79 @@
+from unittest import SkipTest
+
+from holoviews.element.comparison import ComparisonTestCase
+
+try:
+    from holoviews.plotting.bokeh.callbacks import Callback
+    from holoviews.plotting.bokeh.util import bokeh_version
+
+    from bokeh.events import Tap
+    from bokeh.models import Range1d, Plot, ColumnDataSource
+    bokeh_renderer = Store.renderers['bokeh']
+except:
+    bokeh_renderer = None
+
+
+class TestBokehCustomJSCallbacks(ComparisonTestCase):
+
+    def setUp(self):
+        if bokeh_version < str('0.12.5'):
+            raise SkipTest("Bokeh >= 0.12.5 required to test callbacks")
+
+
+    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["y"] = cb_obj["y"];\ndata["x"] = cb_obj["x"];\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["y1"] = cb_data["geometry"]["y1"];\n'
+                'data["y0"] = cb_data["geometry"]["y0"];\n'
+                'data["x0"] = cb_data["geometry"]["x0"];\n'
+                'data["x1"] = cb_data["geometry"]["x1"];\n')
+        self.assertEqual(js_code, code)
+
+
+class TestBokehServerJSCallbacks(ComparisonTestCase):
+
+    def setUp(self):
+        if bokeh_version < str('0.12.5'):
+            raise SkipTest("Bokeh >= 0.12.5 required to test callbacks")
+
+    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['1d']['indices'] = [1, 2, 3]
+        msg = Callback.resolve_attr_spec('cb_obj.selected.1d.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})