Install testdouble when the addon is installed

Author: alexlafroscia

blueprints/ember-cli-testdouble/index.js

@@ -0,0 +1,15 @@
+/* eslint-env node */
+
+'use strict';
+
+module.exports = {
+  normalizeEntityName: function() {
+    // this prevents an error when the entityName is
+    // not specified (since that doesn't actually matter
+    // to us
+  },
+
+  afterInstall: function() {
+    return this.addPackageToProject('testdouble', '^2.0.0');
+  }
+};