Error: Vue is unable to access the property '_modulesNamespaceMap' because it is undefined

Question

Error: Vue is unable to access the property '_modulesNamespaceMap' because it is undefined

I've been working on a simple web app to enhance my testing skills in Vue using Vue Test Utils and Jest. However, I encountered an error related to Vue while trying to console log and check if AddDialog is present in my Home file. The error message I received is:

TypeError: Cannot read property '_modulesNamespaceMap' of undefined

Below is the code snippet I used for testing:

// Imports
import Home from '@/components/Home'
// Utilities
import {createLocalVue, mount} from '@vue/test-utils'
import Vue from 'vue'
import Vuetify from 'vuetify'
import AddDialog from "@/components/AddDialog";

Vue.use(Vuetify)

describe('Home.vue', () => {

    const localVue = createLocalVue()
    let vuetify
    beforeEach(() => {
        vuetify = new Vuetify()
    })
    test('creates a todo', async () => {
        const wrapper = mount(Home)
        console.log(wrapper)
    })
})

javascript vue.js vuejs2 jestjs vue-test-utils

Answer 1

Answer №1

When you're within the Home component, make sure to utilize the store in order to render properly. Check out more information on this topic here: https://vue-test-utils.vuejs.org/guides/using-with-vuex.html

Answer 2

When you're within the Home component, make sure to utilize the store in order to render properly. Check out more information on this topic here: https://vue-test-utils.vuejs.org/guides/using-with-vuex.html

Answer 3

Answer №2

As pointed out by @Raynhour, the issue arises when store is not included in the test. To address this, I will provide a code snippet that resolved the

TypeError: Cannot read property '_modulesNamespaceMap' of undefined

error in one of my components utilizing Vuex.

describe("MyComponent.vue", () => {
  let actions: any;
  let getters: any;
  let state: any;
  let store: any;
  let wrapper: any;

  beforeEach(() => {
    actions = {
      sampleAction: jest.fn(),
    };
    getters = {
      sampleGetter: jest.fn(),
    };
    state = {
      sampleState: jest.fn(),
    };

    store = new Vuex.Store({
      modules: {
        requests: {
          namespaced: true,
          actions,
          getters,
          state,
        },
      },
    });
  });

  wrapper = shallowMount(MyComponent, {
    store,
  });

  ... // Additional test cases...
});

Answer 4

As pointed out by @Raynhour, the issue arises when store is not included in the test. To address this, I will provide a code snippet that resolved the

TypeError: Cannot read property '_modulesNamespaceMap' of undefined

error in one of my components utilizing Vuex.

describe("MyComponent.vue", () => {
  let actions: any;
  let getters: any;
  let state: any;
  let store: any;
  let wrapper: any;

  beforeEach(() => {
    actions = {
      sampleAction: jest.fn(),
    };
    getters = {
      sampleGetter: jest.fn(),
    };
    state = {
      sampleState: jest.fn(),
    };

    store = new Vuex.Store({
      modules: {
        requests: {
          namespaced: true,
          actions,
          getters,
          state,
        },
      },
    });
  });

  wrapper = shallowMount(MyComponent, {
    store,
  });

  ... // Additional test cases...
});

Error: Vue is unable to access the property '_modulesNamespaceMap' because it is undefined

Answer №1

Answer №2

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