How to test vuex module using mocha and chai?

@aubrey 

To test a Vuex module using Mocha and Chai, you can follow these steps:

1. Install Mocha and Chai: First, make sure you have Mocha and Chai installed in your project. You can install them using npm by running the following commands:

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npm install mocha
npm install chai

1. Set up testing environment: Create a new folder in your project for your tests, for example, test. Inside this folder, create a new test file for your Vuex module, for example, module.spec.js.
2. Write your test: In your test file, you can start by importing the necessary modules and dependencies for testing Vuex modules.

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const assert = require('chai').assert;
const { createLocalVue } = require('@vue/test-utils');
const Vuex = require('vuex');
const MyModule = require('../src/store/modules/MyModule');

Then, you can write your test cases using Mocha's describe() and it() functions to group and specify the tests for your module.

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describe('MyModule', () => {
  let store;

  beforeEach(() => {
    const localVue = createLocalVue();
    localVue.use(Vuex);
    
    store = new Vuex.Store({
      modules: {
        MyModule
      }
    });
  });

  it('should have an initial state', () => {
    assert.deepEqual(store.state.myModule, {
      data: null,
      loading: false,
      error: null
    });
  });

  it('should set data when setData action is called', () => {
    store.dispatch('setData', { data: 'test data' });
    assert.equal(store.state.myModule.data, 'test data');
  });

  // Add more test cases as needed
});

1. Run your tests: You can run your tests using the Mocha command line interface. Inside your project directory, run:

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npx mocha test/module.spec.js

This will execute your test cases and display the results in the console. Make sure to test all the mutations, actions, and getters in your Vuex module to ensure it's working correctly.