I'm trying to test a react component that contains a list of results, and a text input that the user can type into in order to filter the results. A 100ms debounce is used to delay the filter as the user types. The debounce is causing the current test to break:
test('typing ', async () => {
render(<PunkApi />);
await userEvent.type(textInput, 'nothing should show');
// * There is a delay here that I need to accommodate for
// Get table component and check that there are 0 results:
const table = await screen.findByRole('table');
const [tableHeader, tableBody] = within(table).getAllByRole('rowgroup');
expect(tableBody).toBeEmptyDOMElement(); // Error: received 15 results.
});
I can get the test to work by including a setTimeout/promise:
function delay(time: number): Promise<void> {
return new Promise((resolve) => setTimeout(resolve, time));
}
// insert this line in the above test at the * location:
await act(() => delay(600));
So I know the issue is to do with an async issue with my test/code. I understand that the correct way to handle this involves jest.useFakeTimers()
instead of the setTimeout/promise solution I've fudged. But when I try to implement I get an error before I even change the test:
beforeAll(() => {
jest.useFakeTimers();
});
afterEach(() => {
jest.clearAllTimers();
});
As soon as I include the jest.useFakeTimers();
line, I get this error when I run tests:
thrown: "Exceeded timeout of 5000 ms for a test.
Use jest.setTimeout(newTimeout) to increase the timeout value, if this is a long-running test."
Can anyone help to show me how this is supposed to work?
Credit to Afsanefda for pointing me towards the testing-library.com/docs/dom-testing-library/api-async/#waitfor async documents.
test('typing ', async () => {
render(<PunkApi />);
const buzzRow = await screen.findByText(/buzz/i); // ADDED THIS LINE: Initially there is a result with the word 'buzz' in it.
await userEvent.type(textInput, 'nothing should show');
// * There is a delay here that I need to accommodate for
// INSERT FOLLOWING LINE (waitForElementToBeRemoved, as per documentation):
await waitForElementToBeRemoved(emptyResultsMessage)
// Get table component and check that there are 0 results:
const table = await screen.findByRole('table');
const [tableHeader, tableBody] = within(table).getAllByRole('rowgroup');
expect(tableBody).toBeEmptyDOMElement(); // THIS NOW PASSES CORRECTLY
});
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