How can I test router guards in Vue.js?

How can I test router guards in Vue.js?

You can test router guards in Vue.js by using Vue Test Utils along with Jest or Mocha. Would you like a code example?

Yes, please provide a code example for testing a simple router guard.

Sure! Here's a basic example:

import { createRouter, createWebHistory } from 'vue-router';
import { mount } from '@vue/test-utils';

const router = createRouter({
  history: createWebHistory(),
  routes: [
    { path: '/protected', component: ProtectedComponent, beforeEnter: guard }
  ]
});

function guard(to, from, next) {
  const isAuthenticated = false; // Simulate authentication
  if (isAuthenticated) {
    next();
  } else {
    next({ path: '/login' });
  }
}

test('redirects to login if not authenticated', async () => {
  const wrapper = mount(App, { global: { plugins: [router] } });
  await router.push('/protected');
  expect(router.currentRoute.value.fullPath).toBe('/login');
});

This tests if the user is redirected to the login page when not authenticated.

What if I want to test an authenticated route?

You can modify the isAuthenticated variable in the guard function to true and test that the route is accessible. Would you like to see that example?