const saveContentToXML = () => {
    if(this.props.message && this.props.message.details){
        fileDownload(this.props.message.details, this.props.message.title);
    }
}

TypeError: window.URL.createObjectURL is not a function

test('Save Content as XML Test', () =>{
    const component = shallow(<Message details={details} />);
    component.instance().saveContentToXML();
});