chore: add chai and dirty-chai for better test assertions

Author: nknapp

package-lock.json

@@ -34,6 +34,8 @@
     "babel-loader": "^5.0.0",
     "babel-runtime": "^5.1.10",
     "benchmark": "~1.0",
+    "chai": "^4.2.0",
+    "dirty-chai": "^2.0.1",
     "dtslint": "^0.5.5",
     "dustjs-linkedin": "^2.0.2",
     "eco": "~1.1.0-rc-3",

package.json

@@ -1,5 +1,11 @@
 require('./common');
 
+var chai = require('chai');
+var dirtyChai = require('dirty-chai');
+
+chai.use(dirtyChai);
+global.expect = chai.expect;
+
 global.Handlebars = require('../../lib');
 
 global.CompilerContext = {

spec/env/node.js

@@ -20,6 +20,8 @@
       }
     </script>
     <script src="/node_modules/mocha/mocha.js"></script>
+    <script src="/node_modules/chai/chai.js"></script>
+    <script src="/node_modules/dirty-chai/lib/dirty-chai.js"></script>
     <script>
       mocha.setup('bdd');
     </script>