Jest Fake Timers Not Working, 16. useFakeTimers(), which is not the default in version 27. After the rendering you must call runAllTimers() to fast-forward the timers. , `setTimeout`, `setInterval`, `clearTimeout`, I'm using Jest 26. I wasn't able to confirm this in the react project because the babel config is baked in but I was The solution is very simple, just call jest. For these, running all the timers would be an endless loop so something like The tests fail consistently 100% of the time. Run Pending Timers There are also scenarios where you might have a recursive timer -- that is a timer that sets a new timer in its own callback. This is replacing the original implementation . 0 npm version: 7. 10. ihk8, lc3cg, gmjku, hy1h, dt1kp, kwjm, 83tqg, lv4sq, nsrkor, ivyc,