feat(mocha): switch to using mocha for testing the module

Author: mbroadst

Diff for: package.json

@@ -23,8 +23,9 @@
     "nan": "^2.9.2"
   },
   "devDependencies": {
-    "mongodb-extjson": "^2.1.0",
-    "nodeunit": "~0.9.0"
+    "chai": "^4.1.2",
+    "mocha": "^3.5.3",
+    "mongodb-extjson": "^2.1.0"
   },
   "main": "./index",
   "directories": {
@@ -35,7 +36,7 @@
   },
   "scripts": {
     "install": "(node-gyp rebuild 2> builderror.log) || (exit 0)",
-    "test": "nodeunit ./test/node"
+    "test": "mocha ./test/node"
   },
   "licenses": [
     {

Diff for: test/node/decimal128_tests.js

@@ -1,6 +1,7 @@
 'use strict';
 
-let Decimal128 = require('../../lib/bson/decimal128'),
+var BSON = require('../..'),
+  Decimal128 = BSON.Decimal128,
   expect = require('chai').expect,
   createBSON = require('../utils');
 

Diff for: test/node/map_tests.js

@@ -1,6 +1,7 @@
 'use strict';
 
-var M = require('../../lib/bson/map');
+var BSON = require('../..');
+var M = BSON.Map;
 var createBSON = require('../utils');
 const expect = require('chai').expect;
 

Diff for: test/node/serialize_with_buffer_tests.js

@@ -1,7 +1,7 @@
 'use strict';
 
-let createBSON = require('../utils'),
-  expect = require('chai').expect;
+var createBSON = require('../utils');
+var expect = require('chai').expect;
 
 describe('serializeWithBuffer', function() {
   /**