create a test case using `vue-test-utils` and `chai` for a vue 3 plugin, to see that it get's installed ok and an app can mount and display a message via a property in typescript

First, we'll create a simple Vue plugin that can be tested:

myPlugin.ts

index.ts
import { App } from 'vue';

export const myPlugin = {
  install(app: App, options: any) {
    console.log('installed!');
    
    app.config.globalProperties.$myPlugin = () => {
      console.log('called!');
      return options.message;
    };
  },
};

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13 lines

This plugin creates a global function $myPlugin which returns the message set in options.

Let's create a test file to ensure the plugin is installed and the app can mount and display the message properly:

myPlugin.spec.ts

index.ts
import { expect } from 'chai';
import { createApp } from 'vue';
import { myPlugin } from './myPlugin';

describe('myPlugin', () => {
  it('should install', () => {
    const app = createApp({});
    app.use(myPlugin);
    expect(app.config.globalProperties.$myPlugin).to.be.a('function');
  });

  it('should display message', () => {
    const app = createApp({
      template: '<div>{{ $myPlugin() }}</div>',
    });
    app.use(myPlugin, { message: 'Hello World!' });
    app.mount('#app');
    expect(app.$el.textContent).to.equal('Hello World!');
  });
});

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21 lines

In the first test, we install the plugin and check if the $myPlugin function is available on the app's global properties.

In the second test, we create a Vue instance with a template that renders the $myPlugin function as text. We then install the plugin and mount the app. Finally, we check if the rendered text matches the expected message.

Make sure to add @vue/test-utils, mocha, chai, and jsdom to your project and configure the testing environment appropriately.

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related categories

vue-test-utils
chai
vue3

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