The following is an example of a spySpeakerReducer in JavaScript. The spySpeakerReducer allows you to determine how many times it might have been called.

import { speakerReducer as original_speakerReducer } from './reducers';
 
 export let callCounter = 0;
 
 export function spySpeakerReducer(state, action) {
   callCounter++;
   
   return original_speakerReducer(state,action);
 }