Add failing test for groupby colors

Author: rreusser

test/jasmine/tests/transform_groupby_test.js

@@ -63,6 +63,23 @@ describe('groupby', function() {
             });
         });
 
+        it('varies the color for each expanded trace', function () {
+            var uniqueColors = {};
+            var dataOut = [];
+            var dataIn = [{
+                y: [1, 2, 3],
+                transforms: [{type: 'groupby', groups: ['a', 'b', 'c']}]
+            }];
+
+            Plots.supplyDataDefaults(dataIn, dataOut, {}, {});
+
+            for (var i = 0; i < dataOut.length; i++) {
+                uniqueColors[dataOut[i].marker.color] = true;
+            }
+
+            expect(Object.keys(uniqueColors).length).toEqual(3);
+        });
+
         it('Accepts deprecated object notation for styles', function(done) {
             var oldStyleMockData = [{
                 mode: 'markers',