Using qunit and jsmock to test the ie9ify plugin. Sadly, it doesn't look like I can mock any of the new site mode functions

ie9ify.tests.js

// Getting closer...

var ctrl = new MockControl();
var windowMock = ctrl.createMock(window.external);

//normally, you wouldn't need this next line, but it seems to be required in this case because window.external is a black box
windowMock.addMockMethod('msIsSiteMode');
windowMock.expects().msIsSiteMode().andReturn(true);
                
//But this is still false...
equals($.ie9ify.isPinned(), true, 'isPinned should be true');