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fill-lazy-items-till-leaf-with-head.test.tsx
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fill-lazy-items-till-leaf-with-head.test.tsx
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import React from 'react'
import { fillLazyItemsTillLeafWithHead } from './fill-lazy-items-till-leaf-with-head'
import { CacheStates, CacheNode } from '../../../shared/lib/app-router-context'
import type { FlightData } from '../../../server/app-render/types'
const getFlightData = (): FlightData => {
return [
[
[
'',
{
children: [
'linking',
{
children: [
'about',
{
children: ['', {}],
},
],
},
],
},
null,
null,
true,
],
<h1>About Page!</h1>,
<>
<title>About page!</title>
</>,
],
]
}
describe('fillLazyItemsTillLeafWithHead', () => {
it('should fill lazy items till leaf with head', () => {
const cache: CacheNode = {
status: CacheStates.LAZY_INITIALIZED,
data: null,
subTreeData: null,
parallelRoutes: new Map(),
}
const existingCache: CacheNode = {
data: null,
status: CacheStates.READY,
subTreeData: <>Root layout</>,
parallelRoutes: new Map([
[
'children',
new Map([
[
'linking',
{
data: null,
status: CacheStates.READY,
subTreeData: <>Linking</>,
parallelRoutes: new Map([
[
'children',
new Map([
[
'',
{
data: null,
status: CacheStates.READY,
subTreeData: <>Page</>,
parallelRoutes: new Map(),
},
],
]),
],
]),
},
],
]),
],
]),
}
const flightData = getFlightData()
if (typeof flightData === 'string') {
throw new Error('invalid flight data')
}
// Mirrors the way router-reducer values are passed in.
const flightDataPath = flightData[0]
// eslint-disable-next-line @typescript-eslint/no-unused-vars
const [treePatch, _subTreeData, head] = flightDataPath.slice(-3)
fillLazyItemsTillLeafWithHead(cache, existingCache, treePatch, head)
const expectedCache: CacheNode = {
data: null,
status: CacheStates.LAZY_INITIALIZED,
subTreeData: null,
parallelRoutes: new Map([
[
'children',
new Map([
[
'linking',
{
data: null,
status: CacheStates.LAZY_INITIALIZED,
subTreeData: null,
parallelRoutes: new Map([
[
'children',
new Map([
[
'about',
{
data: null,
parallelRoutes: new Map([
[
'children',
new Map([
[
'',
{
data: null,
status: CacheStates.LAZY_INITIALIZED,
subTreeData: null,
parallelRoutes: new Map(),
head: (
<>
<title>About page!</title>
</>
),
},
],
]),
],
]),
subTreeData: null,
status: CacheStates.LAZY_INITIALIZED,
},
],
[
'',
{
data: null,
status: CacheStates.READY,
subTreeData: <>Page</>,
parallelRoutes: new Map(),
},
],
]),
],
]),
},
],
]),
],
]),
}
expect(cache).toMatchObject(expectedCache)
})
})