nodeunit unit test for validating xml-crypto generated signed xml.

TestSignedXml.js

var testrunner = require('nodeunit').reporters.default;
process.chdir(__dirname);
testrunner.run(['.']);

exports.testSignedXml = function(test){
    
     var SignedXml = require('xml-crypto').SignedXml   
      , fs = require('fs')
      , dom = require('xmldom').DOMParser; 

    var xml = "<library>" +
                "<book>" +
                  "<name>Harry Potter</name>" +
                "</book>" +
              "</library>"

    var sig = new SignedXml()
    sig.addReference("//*[local-name(.)='book']")    
    sig.signingKey = fs.readFileSync("private.pem")
    sig.computeSignature(xml)      
    
    var signed = sig.getSignedXml();
    console.log(signed);
    
    var doc = new dom().parseFromString(signed);
    
    /*
        Expecting this structure:
        <library>
            <book Id="_0">
                <name>Harry Potter</name>
            </book>        
            <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
                <SignedInfo>
                    <CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
                    <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
                    <Reference URI="#_0">
                        <Transforms><Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/></Transforms>
                        <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
                        <DigestValue>cdiS43aFDQMnb3X8yaIUej3+z9Q=</DigestValue>
                    </Reference>
                </SignedInfo>
                <SignatureValue>J79hiSUrKdLOuX....Mthy1M=</SignatureValue>
            </Signature>
        </library>        
    */
        
    test.ok(doc.documentElement.nodeName == "library", "root node = <library>.");
    test.ok(doc.childNodes.length == 1, "only one root node is expected.");
    test.ok(doc.documentElement.childNodes.length == 2, "<library> should have two child nodes : <book> and <Signature>");
    
    test.done();
};