Fix webdriver tests for node 4.0

package.json

@@ -35,12 +35,15 @@
     "html2canvas-proxy": "0.0.5",
     "humanize-duration": "^2.0.1",
     "lodash": "^3.10.1",
-    "png-js": "^0.1.1",
+    "pngjs": "^2.2.0",
     "requirejs": "^2.1.20",
+    "sauce-connect-launcher": "^0.13.0",
     "wd": "^0.4.0"
   },
   "scripts": {
-    "test": "grunt travis --verbose"
+    "test": "grunt travis --verbose",
+    "start": "grunt server",
+    "sauceconnect": "tests/sauceconnect.js"
   },
   "homepage": "http://html2canvas.hertzen.com",
   "license": "MIT"

tests/sauceconnect.js

@@ -0,0 +1,13 @@
+const sauceConnectLauncher = require('sauce-connect-launcher');
+
+sauceConnectLauncher({
+    username: process.env.SAUCE_USERNAME,
+    accessKey: process.env.SAUCE_ACCESS_KEY,
+    logger: console.log
+}, err => {
+    if (err) {
+        console.error(err.message);
+        return;
+    }
+    console.log('Sauce Connect ready');
+});

tests/selenium.js

@@ -6,7 +6,7 @@
         url = require("url"),
         path = require("path"),
         base64_arraybuffer = require('base64-arraybuffer'),
-        PNG = require('png-js'),
+        PNG = require('pngjs').PNG,
         Promise = require('bluebird'),
         _ = require('lodash'),
         humanizeDuration = require("humanize-duration"),
@@ -20,9 +20,15 @@
     var port = 8080;
 
     function getPixelArray(base64) {
-        return new Promise(function(resolve) {
-            var arraybuffer = base64_arraybuffer.decode(base64);
-            (new PNG(arraybuffer)).decodePixels(resolve);
+        return new Promise(function(resolve, reject) {
+            const arraybuffer = base64_arraybuffer.decode(base64);
+            new PNG().parse(arraybuffer, (error, data) => {
+                if (error) {
+                    reject(error);
+                } else {
+                    resolve(data.data);
+                }
+            });
         });
     }
 
@@ -78,7 +84,7 @@
         return Promise.resolve(browser
             .then(utils.loadTestPage(browser, test, port))
             .then(captureScreenshots(browser))
-            .then(analyzeResults(test))).cancellable();
+            .then(analyzeResults(test)));
     }
 
     exports.tests = function(browsers, singleTest) {