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| 1 | +import * as React from 'react'; |
| 2 | +import { FetchMock } from 'jest-fetch-mock'; |
| 3 | +import { render, wait } from '@testing-library/react'; |
| 4 | + |
| 5 | +import { DataProvider, preloadData, createDataClient } from '../common'; |
| 6 | +import { useDataClient } from '../hooks'; |
| 7 | + |
| 8 | +const fetchMock = fetch as FetchMock; |
| 9 | + |
| 10 | +describe('render-as-you-fetch tests', () => { |
| 11 | + const onError = (e: Event) => { |
| 12 | + e.preventDefault(); |
| 13 | + }; |
| 14 | + |
| 15 | + beforeEach(() => { |
| 16 | + // to suppress error logs from error boundaries |
| 17 | + // https://github.com/facebook/react/issues/11098#issuecomment-412682721 |
| 18 | + window.addEventListener('error', onError); |
| 19 | + fetchMock.resetMocks(); |
| 20 | + jest.useFakeTimers(); |
| 21 | + }); |
| 22 | + afterEach(() => { |
| 23 | + window.removeEventListener('error', onError); |
| 24 | + jest.useRealTimers(); |
| 25 | + }); |
| 26 | + |
| 27 | + it('Should fallback to Suspense boundary properly', async () => { |
| 28 | + fetchMock.mockResponse(JSON.stringify({ message: 'Hello world!' })); |
| 29 | + const client = createDataClient(); |
| 30 | + const url = 'http://localhost:3000/fetch-as-you-render'; |
| 31 | + |
| 32 | + const Component = (props: any) => { |
| 33 | + const data = props.resource.read(); |
| 34 | + |
| 35 | + return <div>{data.message}</div>; |
| 36 | + }; |
| 37 | + const Wrapper = () => { |
| 38 | + const client = useDataClient(); |
| 39 | + const resource = preloadData(client, url); |
| 40 | + |
| 41 | + return ( |
| 42 | + <React.Suspense fallback={<div>Resource is not ready yet...</div>}> |
| 43 | + <Component resource={resource} /> |
| 44 | + </React.Suspense> |
| 45 | + ); |
| 46 | + }; |
| 47 | + |
| 48 | + const App = ( |
| 49 | + <DataProvider client={client}> |
| 50 | + <Wrapper /> |
| 51 | + </DataProvider> |
| 52 | + ); |
| 53 | + |
| 54 | + const { findByText } = render(App); |
| 55 | + |
| 56 | + const suspenseFallback = await findByText('Resource is not ready yet...'); |
| 57 | + |
| 58 | + expect(suspenseFallback).toBeDefined(); |
| 59 | + |
| 60 | + await wait(); |
| 61 | + |
| 62 | + const actualComponent = await findByText('Hello world!'); |
| 63 | + |
| 64 | + expect(actualComponent).toBeDefined(); |
| 65 | + }); |
| 66 | + |
| 67 | + it('Should fallback to Suspense and Error boundaries properly', async () => { |
| 68 | + const fabricatedError = new Error('Fabricated error'); |
| 69 | + fetchMock.mockReject(fabricatedError); |
| 70 | + const client = createDataClient(); |
| 71 | + const url = 'http://localhost:3000/fetch-as-you-render/2'; |
| 72 | + |
| 73 | + class ErrorBoundary extends React.Component { |
| 74 | + state = { error: false, errorObject: null }; |
| 75 | + |
| 76 | + static getDerivedStateFromError(error: Error) { |
| 77 | + return { error: true, errorObject: error }; |
| 78 | + } |
| 79 | + |
| 80 | + render() { |
| 81 | + return !this.state.error ? ( |
| 82 | + this.props.children |
| 83 | + ) : ( |
| 84 | + <div>Error happened!</div> |
| 85 | + ); |
| 86 | + } |
| 87 | + } |
| 88 | + |
| 89 | + const Component = (props: any) => { |
| 90 | + const data = props.resource.read(); |
| 91 | + |
| 92 | + return <div>{data.message}</div>; |
| 93 | + }; |
| 94 | + const Wrapper = () => { |
| 95 | + const client = useDataClient(); |
| 96 | + const resource = preloadData(client, url); |
| 97 | + |
| 98 | + return ( |
| 99 | + <React.Suspense fallback={<div>Resource is not ready yet...</div>}> |
| 100 | + <ErrorBoundary> |
| 101 | + <Component resource={resource} /> |
| 102 | + </ErrorBoundary> |
| 103 | + </React.Suspense> |
| 104 | + ); |
| 105 | + }; |
| 106 | + |
| 107 | + const App = ( |
| 108 | + <DataProvider client={client}> |
| 109 | + <Wrapper /> |
| 110 | + </DataProvider> |
| 111 | + ); |
| 112 | + |
| 113 | + const { findByText } = render(App); |
| 114 | + |
| 115 | + const suspenseFallback = await findByText('Resource is not ready yet...'); |
| 116 | + |
| 117 | + expect(suspenseFallback).toBeDefined(); |
| 118 | + |
| 119 | + await wait(); |
| 120 | + |
| 121 | + const errorFallback = await findByText('Error happened!'); |
| 122 | + |
| 123 | + expect(errorFallback).toBeDefined(); |
| 124 | + }); |
| 125 | +}); |
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