Cannot find module 'expect' from 'extend-expect.js'

[azdanov]

This only happens when I include import 'react-testing-library/extend-expect'. Otherwise react-testing-library works well. What might be the cause of this problem?

I am using latest create-react-app.

Error:

 FAIL  src/App.test.js
  ● Test suite failed to run

    Cannot find module 'expect' from 'extend-expect.js'

      at Resolver.resolveModule (node_modules/jest-resolve/build/index.js:179:17)
      at Object.<anonymous> (node_modules/react-testing-library/dist/extend-expect.js:7:15)

Failing test:

it('should have a title', () => {
  const { getByText } = render(<App />);
  const text = 'Welcome to React';
  expect(getByText(text)).toBeInTheDOM();
});

Passing test:

it('should have a title', () => {
  const { getByText } = render(<App />);
  const text = 'Welcome to React';
  expect(getByText(text).innerHTML).toBe(text);
});

[kentcdodds]

Ah, I know what's up. We don't need to import expect at all. It's a global. I'll fix it now.

[kentcdodds]

A fix should be published in a few minutes.

[azdanov]

Thanks, works as expected now!

[interglobalmedia]

Hi Kent, love your library. Am also taking the course. .toBeInTheDOM() is still in the REAME.md and was a bit confusing when I went in to find out what I could use in a test. However, I only found out that it was not the thing to use when I received a warning after running npm test. Perhaps, however, it might be nice if .toBeInTheDOM() was replaced with .toBeIntheDocument() in the README.md? Thanks!

[kentcdodds]

Thank you for the reminder @interglobalmedia! Would you like to provide that fix?