Testing that the transport parses data properly requires some way to emulate or fake requests and responses. Given that it uses an iframe there aren't much alternatives other than a testing server.
The built-in tests are intended to run with [Jaqen] (//www.npmjs.org/package/jaqen), which is a small testing server built on node.js that allows to programmatically emulate responses and APIs.
Once you have node.js on your system, run this in a console to globally install Jaqen:
$ npm install -g jaqenAfter installing you should be able to fire up an instance by typing jaqen:
$ jaqen
=> Jaqen is listening on port 9000.
=> Press Ctl+C to stop the server.Important: Browsers in general don't allow accessing cross-domain content from iframes, so test files need to be served from the same domain as the fake requests for the tests to run properly.
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Move to the project's root folder and run jaqen from there so it can serve Bifröst and the tests as static files from the same domain as the fake requests:
$ cd bifrost $ jaqen => Jaqen is listening on port 9000. => Press Ctl+C to stop the server.
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Open up a browser and visit http://localhost:9000/tests. You should see the tests run and their results.
If you run Jaqen in a different port you need to change Jaqen's address in tests/index.html.
Happy testing!