<select
                        className="province-select"
                        onChange={this.regionSelected}
                    >
                        <option>
                            Ontario
                        </option>
                        <option>
                            Quebec
                        </option>
                    </select>

const wrapperSuccess = shallow(<RegionSelector {...validData} />);

        wrapperSuccess.find("province-select").simulate('change', { target: { value: 'Ontario' } });

setCurrentRegion(e.target.value)