Changing select value not working on enzyme react test

react-test-select-change.js

it('enter valid data for connection; enable proxy; check if button is disabled', () => {
    const component = getComponent(mount); // mount from enzyme
    enterCredentials(component);
    const proxySelect = component.find('select');

    // currently tried these variants:
    proxySelect.simulate('change', { target: { value: true } } );
    // component.find('select').simulate('select', true);
    // component.find('select').simulate('select', 'Yes');
    // component.find('select').simulate('change', { target: { value: true } } );
    
    // /* Mutating: */
    // proxySelect.node.selectedIndex = 1;
    //
    // Producing this error:
    //
    //      Attempted to access ReactWrapper::node, which was previously a private property on
    //      Enzyme ReactWrapper instances, but is no longer and should not be relied upon.
    //      Consider using the getElement() method instead.
    //
    //  at ReactWrapper.get (node_modules/enzyme/build/ReactWrapper.js:1689:15)

    expect(proxySelect.prop('value')).toBe(true);
    expect(component.find('button').prop('disabled')).toBe(false);
});