feat(test): Added a test for the googlemaps-example.html

To avoid problems like the reported by @pwoloszum here:
#223

test/e2e/05-googlemaps-example.js

@@ -0,0 +1,32 @@
+'use strict';
+
+describe('Loading googlemaps-example.html', function() {
+
+    var ptor, driver;
+    beforeEach(function() {
+        ptor = protractor.getInstance();
+        browser.get('/examples/googlemaps-example.html');
+        driver = ptor.driver;
+    });
+
+    it('should change the Google Maps tiles if clicked on the leaflet control switch layer', function() {
+        ptor.wait(function() {
+            return ptor.isElementPresent(by.xpath('//img[contains(@draggable, "false")]'));
+        });
+
+        var img1 = element(by.xpath('//img[contains(@draggable, "false")][1]'));
+        expect(img1.getAttribute("src")).toMatch("mt.\.googleapis\.com");
+
+        ptor.actions().mouseMove(element(by.xpath('//a[contains(@class, "leaflet-control-layers-toggle")][1]')).find()).perform();
+
+        ptor.sleep(100);
+        ptor.findElements(by.css("input.leaflet-control-layers-selector")).then(function(inputs) {
+            var input = inputs[1];
+            input.click().then(function() {
+                ptor.sleep(300);
+                var img1 = element(by.xpath('//img[contains(@draggable, "false")][1]'));
+                expect(img1.getAttribute("src")).toMatch("khm.\.googleapis\.com");
+            });
+        });
+    });
+});