replaceReducer() does nothing.

[nhooey]

When replaceReducer(someReducerFunction) is run, nothing is set in the mock store. Also, mock stores don't actually have a reducer to begin with.

[metreniuk]

@nhooey You can pass a function to the mockStore instead of object. It will receive all the dispatched actions, thus you can dynamically return new state from the dispatched actions and treat it as a reducer. Hope this will help. reference: https://github.com/arnaudbenard/redux-mock-store/pull/109

[jednano]

I'm throwing an error when replaceReducer is called on my TypeScript fork, @jedmao/redux-mock-store.

[baileytincher]

Why is there a refusal to allow this library to use a reducer as is?

[zgrybus]

Any progress on that?

[turbobeast]

all replaceReducer does is throw an error if you do not pass a function... https://github.com/reduxjs/redux-mock-store/blob/master/src/index.js#L66 that is it! this is a little confusing. one might expect it to do something. might be better to just remove it

You can pass a function to the mockStore instead of object. It will receive all the dispatched actions, thus you can dynamically return new state from the dispatched actions and treat it as a reducer. Hope this will help.

🤔 ...i found it useful to create a mini-redux like this.

    const initialState = { slice: [{}] }
    let currentState = initialState;

    const mockStore = configureStore([middleware])(actions => {
      const action = actions[actions.length - 1];
      currentState = { ...currentState, slice: sliceReducer(currentState.slice, action) };
      return currentState;
    });