I am currently developing Unit Tests for a Javascript method that detects the readiness of the document. This code is already at framework level, so please avoid mentions of this being already implemented in jQuery or another library.

I have successfully simulated the 'readystatechange' change event with the following code:

var event;

event = document.createEventObject();

event.type = 'readystatechange';

document.fireEvent('onreadystatechange',event);

I failed to do the same for the 'load' event. The following code results in an invalid argument error in IE7, thrown by the call to fireEvent on the last line:

event = document.createEventObject();

event.type = 'load';

document.fireEvent('onload',event);

Has anyone done this, or failed to do this before? I am also interested in any suggestion to fire the event in a different way.

Edit: following the suggestion by Crescent Fresh, I changed my code to:

event = document.createEventObject();

event.type = 'load';

document.body.fireEvent('onload',event);

There is no more error, but the listener for 'onload' does not fire. Here is how I configured it:

document.attachEvent('onload',listener);