-
Notifications
You must be signed in to change notification settings - Fork 1.2k
/
use-swr-suspense.test.tsx
399 lines (346 loc) · 9.64 KB
/
use-swr-suspense.test.tsx
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
import { act, fireEvent, screen } from '@testing-library/react'
import React, {
ReactNode,
Suspense,
useEffect,
useReducer,
useState
} from 'react'
import useSWR, { mutate } from 'swr'
import {
createKey,
createResponse,
renderWithConfig,
renderWithGlobalCache,
sleep
} from './utils'
class ErrorBoundary extends React.Component<{ fallback: ReactNode }> {
state = { hasError: false }
static getDerivedStateFromError() {
return {
hasError: true
}
}
render() {
if (this.state.hasError) {
return this.props.fallback
}
return this.props.children
}
}
describe('useSWR - suspense', () => {
afterEach(() => {
jest.clearAllMocks()
jest.restoreAllMocks()
})
it('should render fallback', async () => {
const key = createKey()
function Section() {
const { data } = useSWR(key, () => createResponse('SWR'), {
suspense: true
})
return <div>{data}</div>
}
renderWithConfig(
<Suspense fallback={<div>fallback</div>}>
<Section />
</Suspense>
)
// hydration
screen.getByText('fallback')
await screen.findByText('SWR')
})
it('should render multiple SWR fallbacks', async () => {
const key = createKey()
function Section() {
const { data: v1 } = useSWR<number>(
key,
() => createResponse(1, { delay: 50 }),
{
suspense: true
}
)
const { data: v2 } = useSWR<number>(
'suspense-3',
() => createResponse(2, { delay: 50 }),
{
suspense: true
}
)
return <div>{v1 + v2}</div>
}
renderWithConfig(
<Suspense fallback={<div>fallback</div>}>
<Section />
</Suspense>
)
// hydration
screen.getByText('fallback')
await act(() => sleep(70))
screen.getByText('fallback')
await act(() => sleep(70))
screen.getByText('3')
})
it('should work for non-promises', async () => {
const key = createKey()
function Section() {
const { data } = useSWR(key, () => 'hello', {
suspense: true
})
return <div>{data}</div>
}
renderWithConfig(
<Suspense fallback={<div>fallback</div>}>
<Section />
</Suspense>
)
await screen.findByText('hello')
})
it('should throw errors', async () => {
// eslint-disable-next-line @typescript-eslint/no-empty-function
jest.spyOn(console, 'error').mockImplementation(() => {})
const key = createKey()
function Section() {
const { data } = useSWR(key, () => createResponse(new Error('error')), {
suspense: true
})
return <div>{data}</div>
}
// https://reactjs.org/docs/concurrent-mode-suspense.html#handling-errors
renderWithConfig(
<ErrorBoundary fallback={<div>error boundary</div>}>
<Suspense fallback={<div>fallback</div>}>
<Section />
</Suspense>
</ErrorBoundary>
)
// hydration
screen.getByText('fallback')
await screen.findByText('error boundary')
// 1 for js-dom 1 for react-error-boundray
expect(console.error).toHaveBeenCalledTimes(2)
})
it('should render cached data with error', async () => {
const key = createKey()
mutate(key, 'hello')
function Section() {
const { data, error } = useSWR(
// this value is cached
key,
() => createResponse(new Error('error')),
{
suspense: true
}
)
return (
<div>
{data}, {error ? error.message : null}
</div>
)
}
renderWithGlobalCache(
<Suspense fallback={<div>fallback</div>}>
<Section />
</Suspense>
)
screen.getByText('hello,') // directly from cache
await screen.findByText('hello, error') // get error with cache
})
it('should not fetch when cached data is present and `revalidateIfStale` is false', async () => {
const key = createKey()
mutate(key, 'cached')
let fetchCount = 0
function Section() {
const { data } = useSWR(key, () => createResponse(++fetchCount), {
suspense: true,
revalidateIfStale: false
})
return <div>{data}</div>
}
renderWithGlobalCache(
<Suspense fallback={<div>fallback</div>}>
<Section />
</Suspense>
)
screen.getByText('cached')
await act(() => sleep(50)) // Wait to confirm fetch is not triggered
expect(fetchCount).toBe(0)
})
it('should pause when key changes', async () => {
const renderedResults = []
const initialKey = createKey()
const updatedKey = createKey()
function Section() {
const [key, setKey] = useState(initialKey)
const { data } = useSWR(key, k => createResponse(k), {
suspense: true
})
useEffect(() => {
if (data === initialKey) {
setKey(updatedKey)
}
}, [data])
if (data !== renderedResults[renderedResults.length - 1]) {
renderedResults.push(data)
}
return <>{data}</>
}
renderWithConfig(
<Suspense fallback={<div>fallback</div>}>
<Section />
</Suspense>
)
await screen.findByText(updatedKey)
// fixes https://github.com/vercel/swr/issues/57
// initialKey' -> undefined -> updatedKey
expect(renderedResults).toEqual([initialKey, updatedKey])
})
it('should render correctly when key changes (but with same response data)', async () => {
// https://github.com/vercel/swr/issues/1056
const renderedResults = []
const baseKey = createKey()
function Section() {
const [key, setKey] = useState(1)
const { data } = useSWR(
`${baseKey}-${key}`,
() => createResponse('123'),
{
suspense: true
}
)
if (`${data},${key}` !== renderedResults[renderedResults.length - 1]) {
renderedResults.push(`${data},${key}`)
}
return <div onClick={() => setKey(v => v + 1)}>{`${data},${key}`}</div>
}
renderWithConfig(
<Suspense fallback={<div>fallback</div>}>
<Section />
</Suspense>
)
await screen.findByText('123,1')
fireEvent.click(screen.getByText('123,1'))
await screen.findByText('123,2')
expect(renderedResults).toEqual(['123,1', '123,2'])
})
it('should render correctly when key changes (from null to valid key)', async () => {
// https://github.com/vercel/swr/issues/1836
const renderedResults = []
const baseKey = createKey()
let setData: any = () => {}
const Result = ({ query }: { query: string }) => {
const { data } = useSWR(
query ? `${baseKey}-${query}` : null,
key => createResponse(key, { delay: 200 }),
{
suspense: true
}
)
if (`${data}` !== renderedResults[renderedResults.length - 1]) {
if (data === undefined) {
renderedResults.push(`${baseKey}-nodata`)
} else {
renderedResults.push(`${data}`)
}
}
return <div>{data ? data : `${baseKey}-nodata`}</div>
}
const App = () => {
const [query, setQuery] = useState('123')
if (setData !== setQuery) {
setData = setQuery
}
return (
<>
<br />
<br />
<Suspense fallback={null}>
<Result query={query}></Result>
</Suspense>
</>
)
}
renderWithConfig(<App />)
await screen.findByText(`${baseKey}-123`)
act(() => setData(''))
await screen.findByText(`${baseKey}-nodata`)
act(() => setData('456'))
await screen.findByText(`${baseKey}-456`)
expect(renderedResults).toEqual([
`${baseKey}-123`,
`${baseKey}-nodata`,
`${baseKey}-456`
])
})
it('should render initial data if set', async () => {
const fetcher = jest.fn(() => 'SWR')
const key = createKey()
function Page() {
const { data } = useSWR(key, fetcher, {
fallbackData: 'Initial',
suspense: true
})
return <div>hello, {data}</div>
}
renderWithConfig(
<Suspense fallback={<div>fallback</div>}>
<Page />
</Suspense>
)
expect(fetcher).not.toBeCalled()
screen.getByText('hello, Initial')
})
it('should avoid unnecessary re-renders', async () => {
let renderCount = 0
let startRenderCount = 0
const key = createKey()
function Section() {
++startRenderCount
const { data } = useSWR(key, () => createResponse('SWR'), {
suspense: true
})
++renderCount
return <div>{data}</div>
}
renderWithConfig(
<Suspense fallback={<div>fallback</div>}>
<Section />
</Suspense>
)
// hydration
screen.getByText('fallback')
await screen.findByText('SWR')
await act(() => sleep(50)) // wait a moment to observe unnecessary renders
expect(startRenderCount).toBe(2) // fallback + data
expect(renderCount).toBe(1) // data
})
it('should return `undefined` data for falsy key', async () => {
const key = createKey()
const Section = ({ trigger }: { trigger: boolean }) => {
const { data } = useSWR(
trigger ? key : null,
() => createResponse('SWR'),
{
suspense: true
}
)
return <div>{data || 'empty'}</div>
}
const App = () => {
const [trigger, toggle] = useReducer(x => !x, false)
return (
<div>
<button onClick={toggle}>toggle</button>
<Suspense fallback={<div>fallback</div>}>
<Section trigger={trigger} />
</Suspense>
</div>
)
}
renderWithConfig(<App />)
await screen.findByText('empty')
fireEvent.click(screen.getByRole('button'))
screen.getByText('fallback')
await screen.findByText('SWR')
})
})