add addition to scrollZoom test

Author: birkskyum

test/jasmine/tests/mapbox_test.js

@@ -1153,7 +1153,9 @@ describe('mapbox plots', function() {
         .then(done, done.fail);
     }, LONG_TIMEOUT_INTERVAL);
 
-    it('@noCI @gl should respect scrollZoom config option', function(done) {
+    fit('@noCI @gl should respect scrollZoom config option', function(done) {
+        var mockCopy2 = Lib.extendDeep({}, mock);
+        mockCopy2.config = {scrollZoom: false};
         var relayoutCnt = 0;
         var addOnGd = function() {
             gd.on('plotly_relayout', function() { relayoutCnt++; });
@@ -1170,6 +1172,7 @@ describe('mapbox plots', function() {
 
         var zoom = getMapInfo(gd).zoom;
         expect(zoom).toBeCloseTo(1.234);
+        var zoom0 = zoom;
 
         addOnGd();
 
@@ -1199,6 +1202,14 @@ describe('mapbox plots', function() {
             var zoomNew = getMapInfo(gd).zoom;
             expect(zoomNew).toBeGreaterThan(zoom);
         })
+        .then(function() { return Plotly.newPlot(gd, mockCopy2); })
+        .then(addOnGd)
+        .then(_scroll)
+        .then(function() {
+            // see https://github.com/plotly/plotly.js/issues/3738
+            var zoomNew = getMapInfo(gd).zoom;
+            expect(zoomNew).toBe(zoom0);
+        })
         .then(done, done.fail);
     }, LONG_TIMEOUT_INTERVAL);