javascript - passthru real request with pretender.js -

i trying pass through real webservice in acceptance test in project. pretender intercepts xhr request i'm trying tell pass through example.com

according docs should able this.

var server = new pretender(function(){   this.get('https://www.example.com/:catchall', this.passthrough); });

or this

var server = new pretender(); server.get('https://www.example.com', server.passthrough);

but in console.

uncaught typeerror: pretender intercepted https://www.example.com/foo/bar encountered error: handler.handler not function(…)

because

handler.handler server.passthrough , server.passthrough object?

> server.passthrough   object {numberofcalls: 1, async: undefined}

the test passes in isolation fails when run full suite on console npm test. passes in browser. think have either race condition.

Two