specify default style in modebar tests

Author: antoinerg

src/components/modebar/modebar.js

@@ -163,11 +163,11 @@ proto.createButton = function(config) {
     if(config.toggle) d3.select(button).classed('active', true);
 
     var icon = config.icon;
-    if(config.color) icon.color = config.color;
     if(typeof icon === 'function') {
         button.appendChild(icon());
     }
     else {
+        if(icon) icon.color = config.color;
         button.appendChild(this.createIcon(icon || Icons.question));
     }
     button.setAttribute('data-gravity', config.gravity || 'n');

test/jasmine/tests/modebar_test.js

@@ -38,6 +38,11 @@ describe('ModeBar', function() {
             _context: {
                 displaylogo: true,
                 displayModeBar: true,
+                modeBarStyle: {
+                    orientation: 'h',
+                    bgcolor: 'rgba(255,255,255,0.7)',
+                    iconColor: 'rgba(0, 31, 95, 0.3)'
+                },
                 modeBarButtonsToRemove: [],
                 modeBarButtonsToAdd: [],
                 locale: 'en',