Starting point for mocking window.external methods for Pinned Site functionality

usage.js

//sample usage, with qUnit and pinify
//<script src="js/jquery-1.6.min.js"></script>
//<script src="js/jquery.pinify.js"></script>
//<script src="js/qunit.js"></script>        
        
module('', {
    teardown: function() {
        windowMocks.resetWindow();
    }
});

test('isPinned() when site is pinned should return true', function() {
    windowMocks.mockMsIsSiteMode();
                
    equals($.pinify.isPinned(), true, 'isPinned should be true');                
});

windowMocks.js

var windowMocks = {};
windowMocks.window = window;

//Should be called by user after each test
windowMocks.resetWindow = function() {
    window = windowMocks.window;    
};

windowMocks.mockWindowExternal = function() {
  window = {};                
  window.external = function() {};                    
};

windowMocks.mockMsIsSiteMode = function(value) {
  this.mockWindowExternal();

  window.external.msIsSiteMode = function() { 
    return value || true;      
  };  
};