👀 Views: 51 💬 Answers: 1 📅 Created: 2025-08-07

vue vuex jest unit-testing JavaScript

I'm working with Vue 3 and Vuex 4, and I'm having trouble unit testing my Vuex store actions... Specifically, when I try to test an action that commits a mutation and accesses state properties, I receive the behavior `want to read property 'propertyName' of undefined`. I've set up my test using Vue Test Utils and Jest, but the state seems to be undefined during the test run. Here's a simplified version of my Vuex store: ```javascript // store.js import { createStore } from 'vuex'; export const store = createStore({ state: () => ({ propertyName: 'value', }), mutations: { setProperty(state, payload) { state.propertyName = payload; }, }, actions: { updateProperty({ commit }) { commit('setProperty', 'new value'); }, }, }); ``` And here is how I've set up my test: ```javascript // store.spec.js import { store } from './store'; import { createStore } from 'vuex'; describe('Vuex Store Actions', () => { it('should update propertyName when updateProperty is called', () => { const testStore = createStore(store); testStore.dispatch('updateProperty'); expect(testStore.state.propertyName).toBe('new value'); }); }); ``` When I run the test, I get the behavior mentioned above, indicating that the `state` is not correctly initialized or accessed. I have verified that my Vuex setup is correct and that the state is being defined as expected. I also considered mocking the store, but I want to test the actual implementation. Is there something I'm missing in the way the store is being instantiated in the test, or how the action is being dispatched? Any insights would be greatly appreciated! What's the best practice here?