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feat: use error boundary to capture useEffect errors #539

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merged 1 commit into from
Jan 13, 2021
Merged

feat: use error boundary to capture useEffect errors #539

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4 changes: 3 additions & 1 deletion package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -45,7 +45,9 @@
"@babel/runtime": "^7.12.5",
"@types/react": ">=16.9.0",
"@types/react-dom": ">=16.9.0",
"@types/react-test-renderer": ">=16.9.0"
"@types/react-test-renderer": ">=16.9.0",
"filter-console": "^0.1.1",
"react-error-boundary": "^3.1.0"
},
"devDependencies": {
"@typescript-eslint/eslint-plugin": "^4.9.1",
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8 changes: 1 addition & 7 deletions src/dom/__tests__/errorHook.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -108,13 +108,7 @@ describe('error hook tests', () => {
})
})

/*
These tests capture error cases that are not currently being caught successfully.
Refer to https://github.com/testing-library/react-hooks-testing-library/issues/308
for more details.
*/
// eslint-disable-next-line jest/no-disabled-tests
describe.skip('effect', () => {
describe('effect', () => {
test('should raise effect error', () => {
const { result } = renderHook(() => useEffectError(true))

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23 changes: 14 additions & 9 deletions src/dom/__tests__/resultHistory.test.ts
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@@ -1,34 +1,39 @@
import { renderHook } from '..'

describe('result history tests', () => {
let count = 0
function useCounter() {
const result = count++
if (result === 2) {
function useValue(value: number) {
if (value === 2) {
throw Error('expected')
}
return result
return value
}

test('should capture all renders states of hook', () => {
const { result, rerender } = renderHook(() => useCounter())
const { result, rerender } = renderHook((value) => useValue(value), {
initialProps: 0
})

expect(result.current).toEqual(0)
expect(result.all).toEqual([0])

rerender()
rerender(1)

expect(result.current).toBe(1)
expect(result.all).toEqual([0, 1])

rerender()
rerender(2)

expect(result.error).toEqual(Error('expected'))
expect(result.all).toEqual([0, 1, Error('expected')])

rerender()
rerender(3)

expect(result.current).toBe(3)
expect(result.all).toEqual([0, 1, Error('expected'), 3])

rerender()

expect(result.current).toBe(3)
expect(result.all).toEqual([0, 1, Error('expected'), 3, 3])
})
})
65 changes: 44 additions & 21 deletions src/helpers/createTestHarness.tsx
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@@ -1,42 +1,65 @@
import React, { Suspense } from 'react'
import { ErrorBoundary, FallbackProps } from 'react-error-boundary'
import filterConsole from 'filter-console'

import { RendererProps, WrapperComponent } from '../types/react'
import { addCleanup } from '../core'

import { isPromise } from './promises'
import { RendererProps, WrapperComponent } from '../types/react'

function TestComponent<TProps, TResult>({
hookProps,
callback,
setError,
setValue
}: RendererProps<TProps, TResult> & { hookProps?: TProps }) {
try {
// coerce undefined into TProps, so it maintains the previous behaviour
setValue(callback(hookProps as TProps))
} catch (err: unknown) {
if (isPromise(err)) {
throw err
} else {
setError(err as Error)
function suppressErrorOutput() {
// The error output from error boundaries is notoriously difficult to suppress. To save
// out users from having to work it out, we crudely suppress the output matching the patterns
// below. For more information, see these issues:
// - https://github.com/testing-library/react-hooks-testing-library/issues/50
// - https://github.com/facebook/react/issues/11098#issuecomment-412682721
// - https://github.com/facebook/react/issues/15520
// - https://github.com/facebook/react/issues/18841
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const removeConsoleFilter = filterConsole(
[
/^The above error occurred in the <TestComponent> component:/, // error boundary output
/^Error: Uncaught .+/ // jsdom output
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],
{
methods: ['error']
}
}
return null
)
addCleanup(removeConsoleFilter)
}

function createTestHarness<TProps, TResult>(
rendererProps: RendererProps<TProps, TResult>,
{ callback, setValue, setError }: RendererProps<TProps, TResult>,
Wrapper?: WrapperComponent<TProps>,
suspense: boolean = true
) {
const TestComponent = ({ hookProps }: { hookProps?: TProps }) => {
// coerce undefined into TProps, so it maintains the previous behaviour
setValue(callback(hookProps as TProps))
return null
}
Comment on lines +34 to +38
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I brought this into createTestHarness because:

  1. ErrorFallback needed to be inside and I like consistency
  2. It simplified the props of TestComponent as the rendererProps are already available in the outer scope

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I think I originally moved it out before we moved out testHarness so It makes sense to put it back in since TestComponent isn't required on it's own.


let resetErrorBoundary = () => {}
const ErrorFallback = ({ error, resetErrorBoundary: reset }: FallbackProps) => {
resetErrorBoundary = () => {
resetErrorBoundary = () => {}
reset()
}
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setError(error)
return null
}

suppressErrorOutput()

const testHarness = (props?: TProps) => {
let component = <TestComponent hookProps={props} {...rendererProps} />
resetErrorBoundary()

let component = <TestComponent hookProps={props} />
if (Wrapper) {
component = <Wrapper {...(props as TProps)}>{component}</Wrapper>
}
if (suspense) {
component = <Suspense fallback={null}>{component}</Suspense>
}
return component
return <ErrorBoundary FallbackComponent={ErrorFallback}>{component}</ErrorBoundary>
}

return testHarness
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8 changes: 2 additions & 6 deletions src/helpers/promises.ts
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Expand Up @@ -2,13 +2,9 @@ function resolveAfter(ms: number) {
return new Promise<void>((resolve) => setTimeout(resolve, ms))
}

export async function callAfter(callback: () => void, ms: number) {
async function callAfter(callback: () => void, ms: number) {
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moved the the export at the end of the file

await resolveAfter(ms)
callback()
}

function isPromise<T>(value: unknown): boolean {
return typeof (value as PromiseLike<T>).then === 'function'
}

export { isPromise, resolveAfter }
export { resolveAfter, callAfter }
8 changes: 1 addition & 7 deletions src/native/__tests__/errorHook.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -108,13 +108,7 @@ describe('error hook tests', () => {
})
})

/*
These tests capture error cases that are not currently being caught successfully.
Refer to https://github.com/testing-library/react-hooks-testing-library/issues/308
for more details.
*/
// eslint-disable-next-line jest/no-disabled-tests
describe.skip('effect', () => {
describe('effect', () => {
test('should raise effect error', () => {
const { result } = renderHook(() => useEffectError(true))

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23 changes: 14 additions & 9 deletions src/native/__tests__/resultHistory.test.ts
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Original file line number Diff line number Diff line change
@@ -1,34 +1,39 @@
import { renderHook } from '..'

describe('result history tests', () => {
let count = 0
function useCounter() {
const result = count++
if (result === 2) {
function useValue(value: number) {
if (value === 2) {
throw Error('expected')
}
return result
return value
}

test('should capture all renders states of hook', () => {
const { result, rerender } = renderHook(() => useCounter())
const { result, rerender } = renderHook((value) => useValue(value), {
initialProps: 0
})

expect(result.current).toEqual(0)
expect(result.all).toEqual([0])

rerender()
rerender(1)

expect(result.current).toBe(1)
expect(result.all).toEqual([0, 1])

rerender()
rerender(2)

expect(result.error).toEqual(Error('expected'))
expect(result.all).toEqual([0, 1, Error('expected')])

rerender()
rerender(3)

expect(result.current).toBe(3)
expect(result.all).toEqual([0, 1, Error('expected'), 3])

rerender()

expect(result.current).toBe(3)
expect(result.all).toEqual([0, 1, Error('expected'), 3, 3])
})
})
8 changes: 1 addition & 7 deletions src/server/__tests__/errorHook.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -119,13 +119,7 @@ describe('error hook tests', () => {
})
})

/*
These tests capture error cases that are not currently being caught successfully.
Refer to https://github.com/testing-library/react-hooks-testing-library/issues/308
for more details.
*/
// eslint-disable-next-line jest/no-disabled-tests
describe.skip('effect', () => {
describe('effect', () => {
test('should raise effect error', () => {
const { result, hydrate } = renderHook(() => useEffectError(true))

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44 changes: 44 additions & 0 deletions src/server/__tests__/resultHistory.test.ts
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@@ -0,0 +1,44 @@
import { renderHook } from '..'

describe('result history tests', () => {
function useValue(value: number) {
if (value === 2) {
throw Error('expected')
}
return value
}

test('should capture all renders states of hook', () => {
const { result, hydrate, rerender } = renderHook((value) => useValue(value), {
initialProps: 0
})

expect(result.current).toEqual(0)
expect(result.all).toEqual([0])

hydrate()

expect(result.current).toEqual(0)
expect(result.all).toEqual([0, 0])

rerender(1)

expect(result.current).toBe(1)
expect(result.all).toEqual([0, 0, 1])

rerender(2)

expect(result.error).toEqual(Error('expected'))
expect(result.all).toEqual([0, 0, 1, Error('expected')])

rerender(3)

expect(result.current).toBe(3)
expect(result.all).toEqual([0, 0, 1, Error('expected'), 3])

rerender()

expect(result.current).toBe(3)
expect(result.all).toEqual([0, 0, 1, Error('expected'), 3, 3])
})
})
8 changes: 6 additions & 2 deletions src/server/pure.ts
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Expand Up @@ -20,8 +20,12 @@ function createServerRenderer<TProps, TResult>(
render(props?: TProps) {
renderProps = props
act(() => {
const serverOutput = ReactDOMServer.renderToString(testHarness(props))
container.innerHTML = serverOutput
try {
const serverOutput = ReactDOMServer.renderToString(testHarness(props))
container.innerHTML = serverOutput
} catch (e: unknown) {
rendererProps.setError(e as Error)
}
Comment on lines +23 to +28
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@mpeyper mpeyper Jan 13, 2021 •
edited

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Turns out error boundaries throw synchronously when server rendering. This is the only renderer that has any special treatment for error handling and only in the initial render function. The error boundary behaves normally once it has been hydrated.

})
},
hydrate() {
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