/
prefetch-reducer.test.tsx
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/
prefetch-reducer.test.tsx
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import React from 'react'
import type { fetchServerResponse as fetchServerResponseType } from '../fetch-server-response'
import type { FlightData } from '../../../../server/app-render/types'
jest.mock('../fetch-server-response', () => {
const flightData: FlightData = [
[
'children',
'linking',
'children',
'about',
[
'about',
{
children: ['', {}],
},
],
<h1>About Page!</h1>,
<>
<title>About page!</title>
</>,
],
]
return {
fetchServerResponse: (
url: URL
): ReturnType<typeof fetchServerResponseType> => {
if (url.pathname === '/linking/about') {
return Promise.resolve([flightData, undefined])
}
throw new Error('unknown url in mock')
},
}
})
import { FlightRouterState } from '../../../../server/app-render/types'
import {
CacheNode,
CacheStates,
} from '../../../../shared/lib/app-router-context'
import { createInitialRouterState } from '../create-initial-router-state'
import { PrefetchAction, ACTION_PREFETCH } from '../router-reducer-types'
import { prefetchReducer } from './prefetch-reducer'
import { fetchServerResponse } from '../fetch-server-response'
const getInitialRouterStateTree = (): FlightRouterState => [
'',
{
children: [
'linking',
{
children: ['', {}],
},
],
},
undefined,
undefined,
true,
]
async function runPromiseThrowChain(fn: any): Promise<any> {
try {
return await fn()
} catch (err) {
if (err instanceof Promise) {
await err
return await runPromiseThrowChain(fn)
}
throw err
}
}
describe('prefetchReducer', () => {
it('should apply navigation', async () => {
const initialTree = getInitialRouterStateTree()
const initialCanonicalUrl = '/linking'
const children = (
<html>
<head></head>
<body>Root layout</body>
</html>
)
const initialParallelRoutes: CacheNode['parallelRoutes'] = new Map([
[
'children',
new Map([
[
'linking',
{
status: CacheStates.READY,
parallelRoutes: new Map([
[
'children',
new Map([
[
'',
{
status: CacheStates.READY,
data: null,
subTreeData: <>Linking page</>,
parallelRoutes: new Map(),
},
],
]),
],
]),
data: null,
subTreeData: <>Linking layout level</>,
},
],
]),
],
])
const state = createInitialRouterState({
initialTree,
initialHead: null,
initialCanonicalUrl,
children,
initialParallelRoutes,
isServer: false,
location: new URL('/linking', 'https://localhost') as any,
})
const url = new URL('/linking/about', 'https://localhost')
const serverResponse = await fetchServerResponse(url, initialTree, true)
const action: PrefetchAction = {
type: ACTION_PREFETCH,
url,
tree: initialTree,
serverResponse,
}
const newState = await runPromiseThrowChain(() =>
prefetchReducer(state, action)
)
const expectedState: ReturnType<typeof prefetchReducer> = {
prefetchCache: new Map([
[
'/linking/about',
{
canonicalUrlOverride: undefined,
flightData: serverResponse[0],
tree: [
'',
{
children: [
'linking',
{
children: [
'about',
{
children: ['', {}],
},
],
},
],
},
undefined,
undefined,
true,
],
},
],
]),
pushRef: {
mpaNavigation: false,
pendingPush: false,
},
focusAndScrollRef: {
apply: false,
hashFragment: null,
},
canonicalUrl: '/linking',
cache: {
status: CacheStates.READY,
data: null,
subTreeData: (
<html>
<head></head>
<body>Root layout</body>
</html>
),
parallelRoutes: initialParallelRoutes,
},
tree: [
'',
{
children: [
'linking',
{
children: ['', {}],
},
],
},
undefined,
undefined,
true,
],
}
expect(newState).toMatchObject(expectedState)
})
it('should apply navigation (concurrent)', async () => {
const initialTree = getInitialRouterStateTree()
const initialCanonicalUrl = '/linking'
const children = (
<html>
<head></head>
<body>Root layout</body>
</html>
)
const initialParallelRoutes: CacheNode['parallelRoutes'] = new Map([
[
'children',
new Map([
[
'linking',
{
status: CacheStates.READY,
parallelRoutes: new Map([
[
'children',
new Map([
[
'',
{
status: CacheStates.READY,
data: null,
subTreeData: <>Linking page</>,
parallelRoutes: new Map(),
},
],
]),
],
]),
data: null,
subTreeData: <>Linking layout level</>,
},
],
]),
],
])
const state = createInitialRouterState({
initialTree,
initialHead: null,
initialCanonicalUrl,
children,
initialParallelRoutes,
isServer: false,
location: new URL('/linking', 'https://localhost') as any,
})
const state2 = createInitialRouterState({
initialTree,
initialHead: null,
initialCanonicalUrl,
children,
initialParallelRoutes,
isServer: false,
location: new URL('/linking', 'https://localhost') as any,
})
const url = new URL('/linking/about', 'https://localhost')
const serverResponse = await fetchServerResponse(url, initialTree, true)
const action: PrefetchAction = {
type: ACTION_PREFETCH,
url,
tree: initialTree,
serverResponse,
}
await runPromiseThrowChain(() => prefetchReducer(state, action))
const newState = await runPromiseThrowChain(() =>
prefetchReducer(state2, action)
)
const expectedState: ReturnType<typeof prefetchReducer> = {
prefetchCache: new Map([
[
'/linking/about',
{
canonicalUrlOverride: undefined,
flightData: serverResponse[0],
tree: [
'',
{
children: [
'linking',
{
children: [
'about',
{
children: ['', {}],
},
],
},
],
},
undefined,
undefined,
true,
],
},
],
]),
pushRef: {
mpaNavigation: false,
pendingPush: false,
},
focusAndScrollRef: {
apply: false,
hashFragment: null,
},
canonicalUrl: '/linking',
cache: {
status: CacheStates.READY,
data: null,
subTreeData: (
<html>
<head></head>
<body>Root layout</body>
</html>
),
parallelRoutes: initialParallelRoutes,
},
tree: [
'',
{
children: [
'linking',
{
children: ['', {}],
},
],
},
undefined,
undefined,
true,
],
}
expect(newState).toMatchObject(expectedState)
})
})