React Testing Fake Xmlhttprequest

I am writing some test code for someone's application. I am new to writing tests specifically for React. In one of the methods inside the component, a new XMLHttpRequest object is

Solution 1:

Finally got this working. Added this to the top. I'd imagine it should work with overriding any class.

varFakeXMLHTTPRequests = require('fakexmlhttprequest')
var requests   = []

XMLHttpRequest = function() {
    var r =  newFakeXMLHTTPRequests(arguments)
    requests.push(r)
    return r
}

Thanks to this article for helping me to think this through. http://www.asbjornenge.com/wwc/testing_react_components.html

Can also so this for if using XMLHttpRequest: correct usage of sinon's fake XMLHttpRequest