ReactRefreshLogBox.test.ts

/* eslint-env jest */
import { sandbox } from './helpers'
import { createNext, FileRef } from 'e2e-utils'
import { NextInstance } from 'test/lib/next-modes/base'
import { check } from 'next-test-utils'
import path from 'path'

describe('ReactRefreshLogBox app', () => {
  if (process.env.NEXT_TEST_REACT_VERSION === '^17') {
    it('should skip for react v17', () => {})
    return
  }

  let next: NextInstance

  beforeAll(async () => {
    next = await createNext({
      files: new FileRef(path.join(__dirname, 'fixtures', 'default-template')),
      dependencies: {
        react: 'latest',
        'react-dom': 'latest',
      },
      skipStart: true,
    })
  })
  afterAll(() => next.destroy())

  test('should strip whitespace correctly with newline', async () => {
    const { session, cleanup } = await sandbox(next)

    await session.patch(
      'index.js',
      `
        export default function Page() {
          return (
            <>

                          <p>index page</p>

                          <a onClick={() => {
                            throw new Error('idk')
                          }}>
                            click me
                          </a>
            </>
          )
        }
      `
    )
    await session.evaluate(() => document.querySelector('a').click())

    await session.waitForAndOpenRuntimeError()
    expect(await session.getRedboxSource()).toMatchSnapshot()

    await cleanup()
  })

  test('logbox: can recover from a syntax error without losing state', async () => {
    const { session, cleanup } = await sandbox(next)

    await session.patch(
      'index.js',
      `
        import { useCallback, useState } from 'react'

        export default function Index() {
          const [count, setCount] = useState(0)
          const increment = useCallback(() => setCount(c => c + 1), [setCount])
          return (
            <main>
              <p>{count}</p>
              <button onClick={increment}>Increment</button>
            </main>
          )
        }
      `
    )

    await session.evaluate(() => document.querySelector('button').click())
    expect(
      await session.evaluate(() => document.querySelector('p').textContent)
    ).toBe('1')

    await session.patch('index.js', `export default () => <div/`)

    expect(await session.hasRedbox(true)).toBe(true)
    expect(await session.getRedboxSource()).toMatchSnapshot()

    await session.patch(
      'index.js',
      `
        import { useCallback, useState } from 'react'

        export default function Index() {
          const [count, setCount] = useState(0)
          const increment = useCallback(() => setCount(c => c + 1), [setCount])
          return (
            <main>
              <p>Count: {count}</p>
              <button onClick={increment}>Increment</button>
            </main>
          )
        }
      `
    )

    await check(
      () => session.evaluate(() => document.querySelector('p').textContent),
      /Count: 1/
    )

    expect(await session.hasRedbox()).toBe(false)

    await cleanup()
  })

  // TODO-APP: re-enable when error recovery doesn't reload the page.
  test.skip('logbox: can recover from a event handler error', async () => {
    const { session, cleanup } = await sandbox(next)

    await session.patch(
      'index.js',
      `
        import { useCallback, useState } from 'react'

        export default function Index() {
          const [count, setCount] = useState(0)
          const increment = useCallback(() => {
            setCount(c => c + 1)
            throw new Error('oops')
          }, [setCount])
          return (
            <main>
              <p>{count}</p>
              <button onClick={increment}>Increment</button>
            </main>
          )
        }
      `
    )

    expect(
      await session.evaluate(() => document.querySelector('p').textContent)
    ).toBe('0')
    await session.evaluate(() => document.querySelector('button').click())
    expect(
      await session.evaluate(() => document.querySelector('p').textContent)
    ).toBe('1')

    expect(await session.hasRedbox(true)).toBe(true)
    if (process.platform === 'win32') {
      expect(await session.getRedboxSource()).toMatchSnapshot()
    } else {
      expect(await session.getRedboxSource()).toMatchSnapshot()
    }

    await session.patch(
      'index.js',
      `
        import { useCallback, useState } from 'react'

        export default function Index() {
          const [count, setCount] = useState(0)
          const increment = useCallback(() => setCount(c => c + 1), [setCount])
          return (
            <main>
              <p>Count: {count}</p>
              <button onClick={increment}>Increment</button>
            </main>
          )
        }
      `
    )

    expect(await session.hasRedbox()).toBe(false)

    expect(
      await session.evaluate(() => document.querySelector('p').textContent)
    ).toBe('Count: 1')
    await session.evaluate(() => document.querySelector('button').click())
    expect(
      await session.evaluate(() => document.querySelector('p').textContent)
    ).toBe('Count: 2')

    expect(await session.hasRedbox()).toBe(false)

    await cleanup()
  })

  test('logbox: can recover from a component error', async () => {
    const { session, cleanup } = await sandbox(next)

    await session.write(
      'child.js',
      `
        export default function Child() {
          return <p>Hello</p>;
        }
      `
    )

    await session.patch(
      'index.js',
      `
        import Child from './child'

        export default function Index() {
          return (
            <main>
              <Child />
            </main>
          )
        }
      `
    )

    expect(
      await session.evaluate(() => document.querySelector('p').textContent)
    ).toBe('Hello')

    await session.patch(
      'child.js',
      `
        // hello
        export default function Child() {
          throw new Error('oops')
        }
      `
    )

    expect(await session.hasRedbox(true)).toBe(true)
    expect(await session.getRedboxSource()).toMatchSnapshot()

    // TODO-APP: re-enable when error recovery doesn't reload the page.
    /* const didNotReload = */ await session.patch(
      'child.js',
      `
        export default function Child() {
          return <p>Hello</p>;
        }
      `
    )

    // TODO-APP: re-enable when error recovery doesn't reload the page.
    // expect(didNotReload).toBe(true)
    expect(await session.hasRedbox()).toBe(false)
    expect(
      await session.evaluate(() => document.querySelector('p').textContent)
    ).toBe('Hello')

    await cleanup()
  })

  // https://github.com/pmmmwh/react-refresh-webpack-plugin/pull/3#issuecomment-554137262
  test('render error not shown right after syntax error', async () => {
    const { session, cleanup } = await sandbox(next)

    // Starting here:
    await session.patch(
      'index.js',
      `
        import * as React from 'react';
        class ClassDefault extends React.Component {
          render() {
            return <h1>Default Export</h1>;
          }
        }

        export default ClassDefault;
      `
    )

    expect(
      await session.evaluate(() => document.querySelector('h1').textContent)
    ).toBe('Default Export')

    // Break it with a syntax error:
    await session.patch(
      'index.js',
      `
        import * as React from 'react';

        class ClassDefault extends React.Component {
          render()
            return <h1>Default Export</h1>;
          }
        }

        export default ClassDefault;
      `
    )
    expect(await session.hasRedbox(true)).toBe(true)

    // Now change the code to introduce a runtime error without fixing the syntax error:
    await session.patch(
      'index.js',
      `
        import * as React from 'react';

        class ClassDefault extends React.Component {
          render()
            throw new Error('nooo');
            return <h1>Default Export</h1>;
          }
        }

        export default ClassDefault;
      `
    )
    expect(await session.hasRedbox(true)).toBe(true)

    // Now fix the syntax error:
    await session.patch(
      'index.js',
      `
        import * as React from 'react';

        class ClassDefault extends React.Component {
          render() {
            throw new Error('nooo');
            return <h1>Default Export</h1>;
          }
        }

        export default ClassDefault;
      `
    )
    expect(await session.hasRedbox(true)).toBe(true)

    await check(async () => {
      const source = await session.getRedboxSource()
      return source?.length > 1 ? 'success' : source
    }, 'success')

    expect(await session.getRedboxSource()).toMatchSnapshot()

    await cleanup()
  })

  // https://github.com/pmmmwh/react-refresh-webpack-plugin/pull/3#issuecomment-554137807
  test('module init error not shown', async () => {
    // Start here:
    const { session, cleanup } = await sandbox(next)

    // We start here.
    await session.patch(
      'index.js',
      `
        import * as React from 'react';
        class ClassDefault extends React.Component {
          render() {
            return <h1>Default Export</h1>;
          }
        }
        export default ClassDefault;
      `
    )

    expect(
      await session.evaluate(() => document.querySelector('h1').textContent)
    ).toBe('Default Export')

    // Add a throw in module init phase:
    await session.patch(
      'index.js',
      `
        // top offset for snapshot
        import * as React from 'react';
        throw new Error('no')
        class ClassDefault extends React.Component {
          render() {
            return <h1>Default Export</h1>;
          }
        }
        export default ClassDefault;
      `
    )

    expect(await session.hasRedbox(true)).toBe(true)
    if (process.platform === 'win32') {
      expect(await session.getRedboxSource()).toMatchSnapshot()
    } else {
      expect(await session.getRedboxSource()).toMatchSnapshot()
    }

    await cleanup()
  })

  // https://github.com/pmmmwh/react-refresh-webpack-plugin/pull/3#issuecomment-554144016
  test('stuck error', async () => {
    const { session, cleanup } = await sandbox(next)

    // We start here.
    await session.patch(
      'index.js',
      `
        import * as React from 'react';

        function FunctionDefault() {
          return <h1>Default Export Function</h1>;
        }

        export default FunctionDefault;
      `
    )

    // We add a new file. Let's call it Foo.js.
    await session.write(
      'Foo.js',
      `
        // intentionally skips export
        export default function Foo() {
          return React.createElement('h1', null, 'Foo');
        }
      `
    )

    // We edit our first file to use it.
    await session.patch(
      'index.js',
      `
        import * as React from 'react';
        import Foo from './Foo';
        function FunctionDefault() {
          return <Foo />;
        }
        export default FunctionDefault;
      `
    )

    // We get an error because Foo didn't import React. Fair.
    expect(await session.hasRedbox(true)).toBe(true)
    expect(await session.getRedboxSource()).toMatchSnapshot()

    // Let's add that to Foo.
    await session.patch(
      'Foo.js',
      `
        import * as React from 'react';
        export default function Foo() {
          return React.createElement('h1', null, 'Foo');
        }
      `
    )

    // Expected: this fixes the problem
    expect(await session.hasRedbox()).toBe(false)

    await cleanup()
  })

  // https://github.com/pmmmwh/react-refresh-webpack-plugin/pull/3#issuecomment-554150098
  test('syntax > runtime error', async () => {
    const { session, cleanup } = await sandbox(next)

    // Start here.
    await session.patch(
      'index.js',
      `
        import * as React from 'react';

        export default function FunctionNamed() {
          return <div />
        }
      `
    )
    // TODO: this acts weird without above step
    await session.patch(
      'index.js',
      `
        import * as React from 'react';
        let i = 0
        setInterval(() => {
          i++
          throw Error('no ' + i)
        }, 1000)
        export default function FunctionNamed() {
          return <div />
        }
      `
    )

    await new Promise((resolve) => setTimeout(resolve, 1000))
    await session.waitForAndOpenRuntimeError()
    if (process.platform === 'win32') {
      expect(await session.getRedboxSource()).toMatchSnapshot()
    } else {
      expect(await session.getRedboxSource()).toMatchSnapshot()
    }

    // Make a syntax error.
    await session.patch(
      'index.js',
      `
        import * as React from 'react';
        let i = 0
        setInterval(() => {
          i++
          throw Error('no ' + i)
        }, 1000)
        export default function FunctionNamed() {`
    )

    await new Promise((resolve) => setTimeout(resolve, 1000))
    expect(await session.hasRedbox(true)).toBe(true)
    expect(await session.getRedboxSource()).toMatchSnapshot()

    // Test that runtime error does not take over:
    await new Promise((resolve) => setTimeout(resolve, 2000))
    expect(await session.hasRedbox(true)).toBe(true)
    expect(await session.getRedboxSource()).toMatchSnapshot()

    await cleanup()
  })

  // https://github.com/pmmmwh/react-refresh-webpack-plugin/pull/3#issuecomment-554152127
  test('boundaries', async () => {
    const { session, cleanup } = await sandbox(next)

    await session.write(
      'FunctionDefault.js',
      `
        export default function FunctionDefault() {
          return <h2>hello</h2>
        }
      `
    )
    await session.patch(
      'index.js',
      `
        import FunctionDefault from './FunctionDefault.js'
        import * as React from 'react'
        class ErrorBoundary extends React.Component {
          constructor() {
            super()
            this.state = { hasError: false, error: null };
          }
          static getDerivedStateFromError(error) {
            return {
              hasError: true,
              error
            };
          }
          render() {
            if (this.state.hasError) {
              return this.props.fallback;
            }
            return this.props.children;
          }
        }
        function App() {
          return (
            <ErrorBoundary fallback={<h2>error</h2>}>
              <FunctionDefault />
            </ErrorBoundary>
          );
        }
        export default App;
      `
    )

    expect(
      await session.evaluate(() => document.querySelector('h2').textContent)
    ).toBe('hello')

    await session.write(
      'FunctionDefault.js',
      `export default function FunctionDefault() { throw new Error('no'); }`
    )

    await session.waitForAndOpenRuntimeError()
    expect(await session.getRedboxSource()).toMatchSnapshot()
    expect(
      await session.evaluate(() => document.querySelector('h2').textContent)
    ).toBe('error')

    await cleanup()
  })

  // TODO: investigate why this fails when running outside of the Next.js
  // monorepo e.g. fails when using yarn create next-app
  // https://github.com/vercel/next.js/pull/23203
  test.skip('internal package errors', async () => {
    const { session, cleanup } = await sandbox(next)

    // Make a react build-time error.
    await session.patch(
      'index.js',
      `
        export default function FunctionNamed() {
          return <div>{{}}</div>
        }`
    )

    expect(await session.hasRedbox(true)).toBe(true)
    // We internally only check the script path, not including the line number
    // and error message because the error comes from an external library.
    // This test ensures that the errored script path is correctly resolved.
    expect(await session.getRedboxSource()).toContain(
      `../../../../packages/next/dist/pages/_document.js`
    )

    await cleanup()
  })

  test('unterminated JSX', async () => {
    const { session, cleanup } = await sandbox(next)

    await session.patch(
      'index.js',
      `
        export default () => {
          return (
            <div>
              <p>lol</p>
            </div>
          )
        }
      `
    )

    expect(await session.hasRedbox()).toBe(false)

    await session.patch(
      'index.js',
      `
        export default () => {
          return (
            <div>
              <p>lol</p>
            div
          )
        }
      `
    )

    expect(await session.hasRedbox(true)).toBe(true)

    const source = await session.getRedboxSource()
    expect(source).toMatchSnapshot()

    await cleanup()
  })

  // Module trace is only available with webpack 5
  test('conversion to class component (1)', async () => {
    const { session, cleanup } = await sandbox(next)

    await session.write(
      'Child.js',
      `
        export default function ClickCount() {
          return <p>hello</p>
        }
      `
    )

    await session.patch(
      'index.js',
      `
        import Child from './Child';

        export default function Home() {
          return (
            <div>
              <Child />
            </div>
          )
        }
      `
    )

    expect(await session.hasRedbox()).toBe(false)
    expect(
      await session.evaluate(() => document.querySelector('p').textContent)
    ).toBe('hello')

    await session.patch(
      'Child.js',
      `
        import { Component } from 'react';
        export default class ClickCount extends Component {
          render() {
            throw new Error()
          }
        }
      `
    )

    expect(await session.hasRedbox(true)).toBe(true)
    expect(await session.getRedboxSource()).toMatchSnapshot()

    await session.patch(
      'Child.js',
      `
      import { Component } from 'react';
        export default class ClickCount extends Component {
          render() {
            return <p>hello new</p>
          }
        }
      `
    )

    expect(await session.hasRedbox()).toBe(false)
    expect(
      await session.evaluate(() => document.querySelector('p').textContent)
    ).toBe('hello new')

    await cleanup()
  })

  test('css syntax errors', async () => {
    const { session, cleanup } = await sandbox(next)

    await session.write('index.module.css', `.button {}`)
    await session.patch(
      'index.js',
      `
        import './index.module.css';
        export default () => {
          return (
            <div>
              <p>lol</p>
            </div>
          )
        }
      `
    )

    expect(await session.hasRedbox()).toBe(false)

    // Syntax error
    await session.patch('index.module.css', `.button {`)
    expect(await session.hasRedbox(true)).toBe(true)
    const source = await session.getRedboxSource()
    expect(source).toMatch('./index.module.css:1:1')
    expect(source).toMatch('Syntax error: ')
    expect(source).toMatch('Unclosed block')
    expect(source).toMatch('> 1 | .button {')
    expect(source).toMatch('    | ^')

    // Not local error
    await session.patch('index.module.css', `button {}`)
    expect(await session.hasRedbox(true)).toBe(true)
    const source2 = await session.getRedboxSource()
    expect(source2).toMatchSnapshot()

    await cleanup()
  })

  test('logbox: anchors links in error messages', async () => {
    const { session, cleanup } = await sandbox(next)

    await session.patch(
      'index.js',
      `
        import { useCallback } from 'react'

        export default function Index() {
          const boom = useCallback(() => {
            throw new Error('end http://nextjs.org')
          }, [])
          return (
            <main>
              <button onClick={boom}>Boom!</button>
            </main>
          )
        }
      `
    )

    await session.evaluate(() => document.querySelector('button').click())
    await session.waitForAndOpenRuntimeError()

    const header = await session.getRedboxDescription()
    expect(header).toMatchSnapshot()
    expect(
      await session.evaluate(
        () =>
          document
            .querySelector('body > nextjs-portal')
            .shadowRoot.querySelectorAll('#nextjs__container_errors_desc a')
            .length
      )
    ).toBe(1)
    expect(
      await session.evaluate(
        () =>
          (
            document
              .querySelector('body > nextjs-portal')
              .shadowRoot.querySelector(
                '#nextjs__container_errors_desc a:nth-of-type(1)'
              ) as any
          ).href
      )
    ).toMatchSnapshot()

    await session.patch(
      'index.js',
      `
        import { useCallback } from 'react'

        export default function Index() {
          const boom = useCallback(() => {
            throw new Error('http://nextjs.org start')
          }, [])
          return (
            <main>
              <button onClick={boom}>Boom!</button>
            </main>
          )
        }
      `
    )

    await session.evaluate(() => document.querySelector('button').click())
    await session.waitForAndOpenRuntimeError()

    const header2 = await session.getRedboxDescription()
    expect(header2).toMatchSnapshot()
    expect(
      await session.evaluate(
        () =>
          document
            .querySelector('body > nextjs-portal')
            .shadowRoot.querySelectorAll('#nextjs__container_errors_desc a')
            .length
      )
    ).toBe(1)
    expect(
      await session.evaluate(
        () =>
          (
            document
              .querySelector('body > nextjs-portal')
              .shadowRoot.querySelector(
                '#nextjs__container_errors_desc a:nth-of-type(1)'
              ) as any
          ).href
      )
    ).toMatchSnapshot()

    await session.patch(
      'index.js',
      `
        import { useCallback } from 'react'

        export default function Index() {
          const boom = useCallback(() => {
            throw new Error('middle http://nextjs.org end')
          }, [])
          return (
            <main>
              <button onClick={boom}>Boom!</button>
            </main>
          )
        }
      `
    )

    await session.evaluate(() => document.querySelector('button').click())
    await session.waitForAndOpenRuntimeError()

    const header3 = await session.getRedboxDescription()
    expect(header3).toMatchSnapshot()
    expect(
      await session.evaluate(
        () =>
          document
            .querySelector('body > nextjs-portal')
            .shadowRoot.querySelectorAll('#nextjs__container_errors_desc a')
            .length
      )
    ).toBe(1)
    expect(
      await session.evaluate(
        () =>
          (
            document
              .querySelector('body > nextjs-portal')
              .shadowRoot.querySelector(
                '#nextjs__container_errors_desc a:nth-of-type(1)'
              ) as any
          ).href
      )
    ).toMatchSnapshot()

    await session.patch(
      'index.js',
      `
        import { useCallback } from 'react'

        export default function Index() {
          const boom = useCallback(() => {
            throw new Error('multiple http://nextjs.org links http://example.com')
          }, [])
          return (
            <main>
              <button onClick={boom}>Boom!</button>
            </main>
          )
        }
      `
    )

    await session.evaluate(() => document.querySelector('button').click())
    await session.waitForAndOpenRuntimeError()

    const header4 = await session.getRedboxDescription()
    expect(header4).toMatchInlineSnapshot(
      `"Error: multiple http://nextjs.org links http://example.com"`
    )
    expect(
      await session.evaluate(
        () =>
          document
            .querySelector('body > nextjs-portal')
            .shadowRoot.querySelectorAll('#nextjs__container_errors_desc a')
            .length
      )
    ).toBe(2)
    expect(
      await session.evaluate(
        () =>
          (
            document
              .querySelector('body > nextjs-portal')
              .shadowRoot.querySelector(
                '#nextjs__container_errors_desc a:nth-of-type(1)'
              ) as any
          ).href
      )
    ).toMatchSnapshot()
    expect(
      await session.evaluate(
        () =>
          (
            document
              .querySelector('body > nextjs-portal')
              .shadowRoot.querySelector(
                '#nextjs__container_errors_desc a:nth-of-type(2)'
              ) as any
          ).href
      )
    ).toMatchSnapshot()

    await cleanup()
  })

  // TODO-APP: Catch errors that happen before useEffect
  test.skip('non-Error errors are handled properly', async () => {
    const { session, cleanup } = await sandbox(next)

    await session.patch(
      'index.js',
      `
        export default () => {
          throw {'a': 1, 'b': 'x'};
          return (
            <div>hello</div>
          )
        }
      `
    )

    expect(await session.hasRedbox(true)).toBe(true)
    expect(await session.getRedboxDescription()).toMatchInlineSnapshot(
      `"Error: {\\"a\\":1,\\"b\\":\\"x\\"}"`
    )

    // fix previous error
    await session.patch(
      'index.js',
      `
        export default () => {
          return (
            <div>hello</div>
          )
        }
      `
    )
    expect(await session.hasRedbox(false)).toBe(false)
    await session.patch(
      'index.js',
      `
        class Hello {}

        export default () => {
          throw Hello
          return (
            <div>hello</div>
          )
        }
      `
    )
    expect(await session.hasRedbox(true)).toBe(true)
    expect(await session.getRedboxDescription()).toContain(
      `Error: class Hello {`
    )

    // fix previous error
    await session.patch(
      'index.js',
      `
        export default () => {
          return (
            <div>hello</div>
          )
        }
      `
    )
    expect(await session.hasRedbox(false)).toBe(false)
    await session.patch(
      'index.js',
      `
        export default () => {
          throw "string error"
          return (
            <div>hello</div>
          )
        }
      `
    )
    expect(await session.hasRedbox(true)).toBe(true)
    expect(await session.getRedboxDescription()).toMatchInlineSnapshot(
      `"Error: string error"`
    )

    // fix previous error
    await session.patch(
      'index.js',
      `
        export default () => {
          return (
            <div>hello</div>
          )
        }
      `
    )
    expect(await session.hasRedbox(false)).toBe(false)
    await session.patch(
      'index.js',
      `
        export default () => {
          throw null
          return (
            <div>hello</div>
          )
        }
      `
    )
    expect(await session.hasRedbox(true)).toBe(true)
    expect(await session.getRedboxDescription()).toContain(
      `Error: A null error was thrown`
    )

    await cleanup()
  })

  test('Should not show __webpack_exports__ when exporting anonymous arrow function', async () => {
    const { session, cleanup } = await sandbox(next)

    await session.patch(
      'index.js',
      `
       export default () => {
        if (typeof window !== 'undefined') {
          throw new Error('test')
        }

        return null
       }

      `
    )

    expect(await session.hasRedbox(true)).toBe(true)
    expect(await session.getRedboxSource()).toMatchSnapshot()

    await cleanup()
  })

  test('Unhandled errors and rejections opens up in the minimized state', async () => {
    const { session, browser, cleanup } = await sandbox(next)

    const file = `
    export default function Index() {
      //
      setTimeout(() => {
        throw new Error('Unhandled error')
      }, 0)
      setTimeout(() => {
        Promise.reject(new Error('Undhandled rejection'))
      }, 0)
      return (
        <>
          <button
            id="unhandled-error"
            onClick={() => {
              throw new Error('Unhandled error')
            }}
          >
            Unhandled error
          </button>
          <button
            id="unhandled-rejection"
            onClick={() => {
              Promise.reject(new Error('Undhandled rejection'))
            }}
          >
            Unhandled rejection
          </button>
        </>
      )
    }
    `

    await session.patch('index.js', file)

    // Unhandled error and rejection in setTimeout
    expect(
      await browser.waitForElementByCss('.nextjs-toast-errors').text()
    ).toBe('2 errors')

    // Unhandled error in event handler
    await browser.elementById('unhandled-error').click()
    await check(
      () => browser.elementByCss('.nextjs-toast-errors').text(),
      /3 errors/
    )

    // Unhandled rejection in event handler
    await browser.elementById('unhandled-rejection').click()
    await check(
      () => browser.elementByCss('.nextjs-toast-errors').text(),
      /4 errors/
    )
    expect(await session.hasRedbox()).toBe(false)

    // Add Component error
    await session.patch(
      'index.js',
      file.replace(
        '//',
        "if (typeof window !== 'undefined') throw new Error('Component error')"
      )
    )

    // Render error should "win" and show up in fullscreen
    expect(await session.hasRedbox(true)).toBe(true)

    await cleanup()
  })

  test('Server component errors should open up in fullscreen', async () => {
    const { session, browser, cleanup } = await sandbox(
      next,
      new Map([
        // Start with error
        [
          'app/page.js',
          `
        export default function Page() {
          throw new Error('Server component error')
          return <p id="text">Hello world</p>
        }
        `,
        ],
      ])
    )
    expect(await session.hasRedbox(true)).toBe(true)

    // Remove error
    await session.patch(
      'app/page.js',
      `
      export default function Page() {
        return <p id="text">Hello world</p>
      }
      `
    )
    expect(await browser.waitForElementByCss('#text').text()).toBe(
      'Hello world'
    )
    expect(await session.hasRedbox()).toBe(false)

    // Re-add error
    await session.patch(
      'app/page.js',
      `
      export default function Page() {
        throw new Error('Server component error!')
        return <p id="text">Hello world</p>
      }
      `
    )

    expect(await session.hasRedbox(true)).toBe(true)

    await cleanup()
  })
})