test: add (first) Plotly.redraw test (!!!)

Author: etpinard

test/jasmine/tests/plot_api_test.js

@@ -8,6 +8,7 @@ var Legend = require('@src/components/legend');
 var pkg = require('../../../package.json');
 var subroutines = require('@src/plot_api/subroutines');
 
+var d3 = require('d3');
 var createGraphDiv = require('../assets/create_graph_div');
 var destroyGraphDiv = require('../assets/destroy_graph_div');
 
@@ -779,6 +780,43 @@ describe('Test plot api', function() {
         });
     });
 
+    describe('Plotly.redraw', function() {
+
+        afterEach(destroyGraphDiv);
+
+        it('', function(done) {
+            var gd = createGraphDiv(),
+                initialData = [],
+                layout = { title: 'Redraw' };
+
+            Plotly.newPlot(gd, initialData, layout);
+
+            var trace1 = {
+                x: [1, 2, 3, 4],
+                y: [4, 1, 5, 3],
+                name: 'First Trace'
+            };
+            var trace2 = {
+                x: [1, 2, 3, 4],
+                y: [14, 11, 15, 13],
+                name: 'Second Trace'
+            };
+            var trace3 = {
+                x: [1, 2, 3, 4],
+                y: [5, 3, 7, 1],
+                name: 'Third Trace'
+            };
+
+            var newData = [trace1, trace2, trace3];
+            gd.data = newData;
+
+            Plotly.redraw(gd).then(function() {
+                expect(d3.selectAll('g.trace.scatter').size()).toEqual(3);
+            })
+            .then(done);
+        });
+    });
+
     describe('cleanData', function() {
         var gd;