diff --git a/tasks/test_mock.js b/tasks/test_mock.js
index 957b86b41ef..0503ef8796b 100644
--- a/tasks/test_mock.js
+++ b/tasks/test_mock.js
@@ -1,16 +1,9 @@
 var minimist = require('minimist');
-var jsdom = require('jsdom');
 var path = require('path');
 var fs = require('fs');
 
-var plotlyServerDom = new jsdom.JSDOM('', { runScripts: 'dangerously'});
-// Mock a few things that jsdom doesn't support out-of-the-box
-plotlyServerDom.window.URL.createObjectURL = function() {};
-
-// Run Plotly inside jsdom
-var plotlyJsPath = require.resolve('../build/plotly.js');
-var plotlyJsSource = fs.readFileSync(plotlyJsPath, 'utf-8');
-plotlyServerDom.window.eval(plotlyJsSource);
+var plotlyNode = require('./util/plotly_node');
+var Plotly = plotlyNode('build/plotly.js');
 
 var pathToRoot = path.join(__dirname, '..');
 var pathToMocks = path.join(pathToRoot, 'test', 'image', 'mocks');
@@ -39,7 +32,7 @@ for(var i = 0; i < list.length; i++) {
 
     var filename = path.join(pathToMocks, name + '.json');
     var fig = JSON.parse(fs.readFileSync(filename));
-    var out = plotlyServerDom.window.Plotly.validate(fig.data, fig.layout);
+    var out = Plotly.validate(fig.data, fig.layout);
 
     fail = false;
     assert(name, out);
diff --git a/tasks/test_plain_obj.js b/tasks/test_plain_obj.js
index 20904337e80..007e20c05a2 100644
--- a/tasks/test_plain_obj.js
+++ b/tasks/test_plain_obj.js
@@ -1,19 +1,10 @@
-var jsdom = require('jsdom');
-var fs = require('fs');
-
-var plotlyServerDom = new jsdom.JSDOM('', { runScripts: 'dangerously'});
-// Mock a few things that jsdom doesn't support out-of-the-box
-plotlyServerDom.window.URL.createObjectURL = function() {};
-
-// Run Plotly inside jsdom
-var plotlyJsPath = require.resolve('../build/plotly.js');
-var plotlyJsSource = fs.readFileSync(plotlyJsPath, 'utf-8');
-plotlyServerDom.window.eval(plotlyJsSource);
+var plotlyNode = require('./util/plotly_node');
+var Plotly = plotlyNode('build/plotly.js');
 
 var assertValidate = function(fig, exp) {
     console.log(fig);
 
-    var errorList = plotlyServerDom.window.Plotly.validate(fig.data, fig.layout);
+    var errorList = Plotly.validate(fig.data, fig.layout);
 
     if(exp) {
         if(errorList !== undefined) throw 'should be valid:';
diff --git a/tasks/util/make_schema.js b/tasks/util/make_schema.js
index f2e68036aad..47c1790afa4 100644
--- a/tasks/util/make_schema.js
+++ b/tasks/util/make_schema.js
@@ -1,22 +1,12 @@
 var fs = require('fs');
 var path = require('path');
-var JSDOM = require('jsdom').JSDOM;
+var plotlyNode = require('./plotly_node');
 
 module.exports = function makeSchema(plotlyPath, schemaPath) {
     return function() {
-        var plotlyjsCode = fs.readFileSync(plotlyPath, 'utf-8');
+        var Plotly = plotlyNode(plotlyPath);
 
-        var w = new JSDOM('', {runScripts: 'dangerously'}).window;
-
-        // jsdom by itself doesn't support getContext, and adding the npm canvas
-        // package is annoying and platform-dependent.
-        // see https://github.com/tmpvar/jsdom/issues/1782
-        w.HTMLCanvasElement.prototype.getContext = function() { return null; };
-        w.URL.createObjectURL = function() { return null; };
-
-        w.eval(plotlyjsCode);
-
-        var plotSchema = w.Plotly.PlotSchema.get();
+        var plotSchema = Plotly.PlotSchema.get();
         var plotSchemaStr = JSON.stringify(plotSchema, null, 1);
         fs.writeFileSync(schemaPath, plotSchemaStr);
 
diff --git a/tasks/util/plotly_node.js b/tasks/util/plotly_node.js
new file mode 100644
index 00000000000..2bc34bce069
--- /dev/null
+++ b/tasks/util/plotly_node.js
@@ -0,0 +1,18 @@
+var fs = require('fs');
+var JSDOM = require('jsdom').JSDOM;
+
+var window = new JSDOM('', {
+    runScripts: 'dangerously'
+}).window;
+
+// Mock things that jsdom doesn't support out-of-the-box
+window.URL.createObjectURL = function() {};
+
+module.exports = function plotlyNode(plotlyPath) {
+    // Execute source code by inserting a <script> tag containing it
+    var scriptEl = window.document.createElement('script');
+    scriptEl.textContent = fs.readFileSync(plotlyPath, { encoding: 'utf-8' });
+    window.document.body.appendChild(scriptEl);
+
+    return window.Plotly;
+};