Add script to compile, add roundtrip test

package.json

@@ -59,6 +59,7 @@
     "lib": "./lib"
   },
   "scripts": {
+    "compile": "coffee --compile --output lib/ src",
     "test": "zap",
     "coverage": "nyc npm test && nyc report",
     "coveralls": "nyc npm test && nyc report --reporter=text-lcov | coveralls"

test/roundtrip.coffee

@@ -0,0 +1,38 @@
+xml2js = require '../lib/xml2js'
+assert = require 'assert'
+equ = assert.equal
+
+module.exports =
+  'xml to js to xml': (test) ->
+
+    xml = """
+    <groceries>
+       <dairy>milk</dairy>
+       <produce>celery</produce>
+       <dairy>eggs</dairy>
+       <produce>apples</produce>
+       <dairy>butter</dairy>
+       <produce>eggplant</produce>
+    </groceries>
+    """
+    console.log xml
+
+    options =
+      explicitChildren: true
+      preserveChildrenOrder:true
+      headless: true
+      renderOpts:
+        pretty: true
+
+    xml2js.parseString xml, options, (err, js) ->
+      if err
+        throw err
+      else
+        console.log js
+        builder = new xml2js.Builder options
+        xml2 = builder.buildObject js
+        console.log xml2
+
+        # compare ignore whitespace
+        equ (xml.replace /\s+/g, " "), (xml2.replace /\s+/g, " ")
+        test.done()