Angular override $window attribute

mockModule.js

function Provider($provide) {
    function WindowUserAgentOverride($delegate) {
        Object.defineProperties($delegate.navigator, {
            userAgent: {
                value: 'MSIE9'
            }
        });
        return $delegate;
    }

    WindowUserAgentOverride.$inject = ['$delegate'];
    $provide.decorator('$window', WindowUserAgentOverride);
}

Provider.$inject = ['$provide'];

angular.module('windowMock', []);
angular.module('windowMock').config(Provider);
angular.module('myModule').requires.push('windowMock');