Fix issue around testem.js not found

Author: Gaurav0

app/index.html

@@ -33,7 +33,6 @@
       window.assetMap = {
         loader: "{{rootURL}}assets/loader.js",
         twiddleDeps: "{{rootURL}}assets/twiddle-deps.js",
-        testem: "{{rootURL}}testem.js",
         testSupport: "{{rootURL}}assets/test-support.js",
         testSupportCss: "{{rootURL}}assets/test-support.css",
         testLoader: "{{rootURL}}assets/test-loader.js",

app/services/ember-cli.js

@@ -362,14 +362,12 @@ export default Ember.Service.extend({
     depScriptTags += `<script type="text/javascript" src="${window.assetMap.twiddleDeps}"></script>`;
 
     if (isTestingEnabled) {
-      const testJSFiles = ['testLoader', 'testem'];
+      const testJSFiles = ['testLoader', 'testSupport'];
 
       testJSFiles.forEach(jsFile => {
         depScriptTags += `<script type="text/javascript" src="${window.assetMap[jsFile]}"></script>`;
       });
 
-      depScriptTags += `<script type="text/javascript" src="${window.assetMap.testSupport}"></script>`;
-
       depCssLinkTags += `<link rel="stylesheet" type="text/css" href="${window.assetMap.testSupportCss}">`;
 
       testStuff += `