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next.js/test/unit/router.test.js

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/* global describe, it, expect */
import Router from '../../dist/lib/router/router'
class PageLoader {
constructor (options = {}) {
this.options = options
this.loaded = {}
}
loadPage (route) {
this.loaded[route] = true
if (this.options.delay) {
return new Promise((resolve) => setTimeout(resolve, this.options.delay))
}
}
}
describe('Router', () => {
const request = { clone: () => null }
describe('.prefetch()', () => {
it('should prefetch a given page', async () => {
global.__NEXT_DATA__ = {}
const pageLoader = new PageLoader()
const router = new Router('/', {}, '/', { pageLoader })
const route = '/routex'
await router.prefetch(route)
expect(pageLoader.loaded['/routex']).toBeTruthy()
})
it('should only run two jobs at a time', async () => {
global.__NEXT_DATA__ = {}
// delay loading pages for an hour
const pageLoader = new PageLoader({ delay: 1000 * 3600 })
const router = new Router('/', {}, '/', { pageLoader })
router.prefetch('route1')
router.prefetch('route2')
router.prefetch('route3')
router.prefetch('route4')
// Wait for a bit
await new Promise((resolve) => setTimeout(resolve, 50))
expect(Object.keys(pageLoader.loaded).length).toBe(2)
expect(Object.keys(pageLoader.loaded)).toEqual(['route1', 'route2'])
})
it('should run all the jobs', async () => {
global.__NEXT_DATA__ = {}
const pageLoader = new PageLoader()
const router = new Router('/', {}, '/', { pageLoader })
const routes = ['route1', 'route2', 'route3', 'route4']
router.doFetchRoute = () => Promise.resolve(request)
await router.prefetch(routes[0])
await router.prefetch(routes[1])
await router.prefetch(routes[2])
await router.prefetch(routes[3])
expect(Object.keys(pageLoader.loaded)).toEqual(routes)
})
})
})