test/chore: add chai/expect and sinon to "runtime"-environment

spec/env/runtime.js

@@ -3,6 +3,15 @@ require('./common');
 var fs = require('fs'),
     vm = require('vm');
 
+var chai = require('chai');
+var dirtyChai = require('dirty-chai');
+
+
+chai.use(dirtyChai);
+global.expect = chai.expect;
+
+global.sinon = require('sinon');
+
 global.Handlebars = 'no-conflict';
 
 var filename = 'dist/handlebars.runtime.js';