As far as I know, “I” means if path is not taken, “E” means else path is not taken. However, I found there are two versions of “E”, one is in yellow font the other is in black font. (as you can see in the following pic.)

I am trying to write a unit test that will test a useEffect that calls an api (let’s call it fetchData) so that when the component containing the useEffect unmounts or re-renders from the dependencies updating, we can test the cancellation path.