jsdom 9.1+ does not set document.activeElement when focusing a node

I'm using jsdom with enzyme+mocha+chai to test the behavior of a React component. The component has a method to focus a DOM node (using the usual node.focus()) and I want to test the node is actually focused when it's called.

To know which node is focused, I compare document.activeElement to the node I expect to be focused.

However, after upgrading to jsdom 9.1+, document.activeElement seems always be HTMLBodyElement, even after calling the node's focus() method.

With jsdom 9.0 the tests run fine.

I read jsdom 9.1+ contains some changes related to the focus event, yet I couldn't understand how make document.activeElement behave as expected. Any help?