Select option with React TestUtils Simulate
The problem might be that Simulate.change only calls the select's onChange (which doesn't exist). I don't think it'll actually cause the select's value to change unless you cause that change in your onChange handler.
If you insist on using refs over onChange, change this line:
TestUtils.Simulate.change(selectComponent, { target: { value: 'type_a' } });to this:
selectComponent.getDOMNode().value = 'type_a';