I have a simple test file in ./pages/test.js
import React from 'react'
export default function HomePage () {
  return (
    <main>
      <h1>Testing Next.js With Jest and React Testing Library</h1>
    </main>
  )
}
In ./test/pages/index.test.js I made the following simple test to check if my page is rendering properly and if it has a heading
import React from 'react'
// Using render and screen from test-utils.js instead of
// @testing-library/react
import { render, screen } from '../test-utils'
import HomePage from '../../pages/test'
describe('HomePage', () => {
  it('should render the heading', () => {
    render(<HomePage />)
    const heading = screen.getByText('Testing Next.js With Jest and React Testing Library')
    // we can only use toBeInTheDocument because it was imported
    // in the jest.setup.js and configured in jest.config.js
    expect(heading).toBeInTheDocument()
  })
})
After running the test, I get the following error
 FAIL  pages/test.js
  ● Test suite failed to run
    Your test suite must contain at least one test.
      at onResult (node_modules/@jest/core/build/TestScheduler.js:175:18)
      at node_modules/@jest/core/build/TestScheduler.js:304:17
      at node_modules/emittery/index.js:260:13
          at Array.map (<anonymous>)
      at Emittery.Typed.emit (node_modules/emittery/index.js:258:23)
 PASS  test/pages/index.test.js
Test Suites: 1 failed, 1 passed, 2 total
Tests:       1 passed, 1 total
Why does jest say I am missing a test?
Why does jest say I am missing a test?
Because Jest thinks pages/test.js is a test file. Jest uses the following regex to detect test files.
(/__tests__/.*|(\\.|/)(test|spec))\\.[jt]sx?$
From the docs,
By default it looks for
.js,.jsx,.tsand.tsxfiles inside of__tests__folders, as well as any files with a suffix of.testor.spec(e.g.Component.test.jsorComponent.spec.js). It will also find files calledtest.jsorspec.js.
A simple solution would be to rename the file.
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