Hooks cannot be defined inside tests. Hook of type "beforeEach" is nested within "check for App".

[code-masala]

Version

27.4.5

Steps to reproduce

upgrade from 26.6.3 to 27.4.5

Expected behavior

No error should be shown

Actual behavior

  41 |              );
  42 |
> 43 |              beforeEach(() => {
     |              ^
  44 |                      fetch.mockClear();
  45 |              });
  46 |

Additional context

@simen

[SimenB]

Please include a reproduction.

[code-masala]

@SimenB code-

describe("Test for Component", () => {
	sendEvent.mockImplementation(() => {});
	const store = configureStore({
		getState: jest.fn()
	});
	it("check for App", () => {
		global.fetch = jest.fn(() =>
			Promise.resolve({
				json: () =>
					Promise.resolve({
						ok: true,
						status: 200,
						statusText: "success",
						data: {}
					})
			})
		);
		beforeEach(() => {
			fetch.mockClear();
		});
		// const component = renderer.create(
		// 	<Provider store={store}>
		// 		<Router>
		// 			<App />
		// 		</Router>
		// 	</Provider>
		// );
		// const tree = component.toJSON();
		// expect(tree).toMatchSnapshot();
	});
});

[code-masala]

@SimenB what do you mean by Please include a reproduction.?

[Smrtnyk]

Why would you put beforeEach in test itself?

[davidtaing]

I've been watching this thread for a few days for activity and thought I'll chip in my 2 cents.

@code-masala This isn't a bug. "test(name, fn, timeout)" as an alias for "it(name, fn, timeout)". Swap it with "test" and see what happens.

Please refer to the docs (linked to relevant section).

describe("****" , () => {
    // A.K.A it
    test("****",  () => {
        // beforeEach
        // expect
    }
})

Please close this issue.

[rpopovici]

I had the same problem in react-native with some tests. What fixed it was to:

• replace jest-environment-jsdom with jsdom in jest.config.js
• use fake timers in legacy mode
• call afterEach(cleanup) in tests

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