JavaScript not being properly executed in HtmlUnit

Question

I'm currently developing some tests with HtmlUnit. It's loading a page that contains braintree.js (their form encryption library). I have a bunch running, but I'm stuck where it calls crypto. The JS in question is:

  (function() {
        try {
            var ab = new Uint32Array(32);
            crypto.getRandomValues(ab);
            sjcl.random.addEntropy(ab, 1024, "crypto.getRandomValues");
        } catch (e) {}
    })();

HtmlUnit is throwing:

EcmaError, ReferenceError, "'crypto' is not defined."

I suppose HtmlUnit doesn't include crypto. Would it be possible to include a crypto library myself?

Answer 1

Based on your comment, I have to tell you that HtmlUnit is a pain in the neck when it comes to JavaScript. It will complain a lot about variables not being defined and unknown functions and so on.

Real browsers are more flexible, eg: they accept syntactically incorrect pieces of JavaScript. HtmlUnit expects everything to be perfect without any kind of error. Furthermore, even if you didn't miss a semicolon, HtmlUnit might complain.

My advice:

• Make sure your JavaScript is syntactically correct
• Avoid the user of complex libraries (jQuery seems to be properly supported)
• If you can use non-minimized versions of libraries it's worth giving it a try
• Try to avoid complex jQuery methods (eg: adding events dynamically to elements)
• And the most important one: Try switching between different BrowserVersions. Internet Explorer (ironically) has proven to provide the best results when it comes to interpreting JavaScript