Add spec_helper.js to test/templates

test/templates/html/spec_runner.html.erb

@@ -19,6 +19,7 @@
     <script src="/templates/console.js"></script>
 
     <!-- find and load test cases -->
+    <script src="/spec/spec_helper.js"></script>
     <% Pathname.glob(TEST_ROOT.join "spec/**/*_spec.js") do |spec| %>
     <script src="/<%= spec.relative_path_from TEST_ROOT %>"></script>
     <% end %>

test/templates/spec/dom_helpers_spec.js

@@ -1,5 +1,3 @@
-var assert = chai.assert;
-
 describe("DOM helpers", function() {
   describe("hasClass()", function() {
     context("create a <div>", function() {

test/templates/spec/spec_helper.js

@@ -0,0 +1,25 @@
+(function() {
+  var SpecHelper = {
+    triggerEvent: function(el, eventName) {
+      var event = document.createEvent("MouseEvents");
+      event.initEvent(eventName, true, true); // type, bubbles, cancelable
+      el.dispatchEvent(event);
+    },
+    randomString: function() {
+      Math.random().toString(36).substring(2);
+    },
+    prepareStageElement: function() {
+      before(function() {
+        this.stageElement = document.createElement("div");
+        this.stageElement.style.display = "none";
+        document.body.appendChild(this.stageElement);
+      });
+      afterEach(function() {
+        this.stageElement.innerHTML = "";
+      });
+    }
+  };
+
+  window.SpecHelper = SpecHelper;
+  window.assert = chai.assert;
+})();