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Questions tagged [testing-library]

Questions about testing JavaScript code with the Testing Library utilities

282 questions
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2 answers

ReferenceError: window is not defined, consider using the "jsdom" test environment (jest V28)

I would like some assistance in resolving this error. Am using Jest V28.0.0. Here's how my package.json's test script & devDependencies look like "scripts":{ ..., "test": "jest --env=node --watchAll --coverage --verbose", }, …
muriukialex
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getting " No QueryClient set, use QueryClientProvider to set one " when testing a react query component with react testing library

I'm getting this error when testing a component that uses react query custom hook: " No QueryClient set, use QueryClientProvider to set one " this is my hook: export default () => { const loginMutation = useMutation( async (payload: LoginDto)…
Erfan Chegini
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Index file causing error with Jest when I import

I am getting an error when I import a file for testing. This is the only line in the file: import Cart from '../../components/cart/Cart'; This is the error: TypeError: Cannot read properties of undefined (reading 'default') 27 | 28…
AdamHinckley
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Svelte: how to spyOn functions specified in template using jest?

I have a Svelte component that imports a function and then provides that function as a click handler in the template. I would like to spyOn and mock this function using jest. After mocking the function, any calls to functions that call the mocked…
Scott Beale
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1 answer

React jest snapshot only returning empty DocumentFragment

I am using React and writing a Modal component like so: const MyModal: FC = memo((props) => { return ( ... ); }); I am trying to test…
Niru
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1 answer

How to test that my input has a ref attribute?

I am using React Testing Library and I have a component that takes in a prop value for a ref that will be used within a . const InputComp = (ref) => I am then passing a simple useRef() into this…
physicsboy
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Testing multiple fetch requests in jest

I cannot find any articles or documentation on how to test multiple synchronous fetch requests in a useEffect. I am fetching data and then before second fetch starts I set a "loading data" tooltip on a button. Once the second fetch is complete the…
LazioTibijczyk
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1 answer

React Jest testing : TestingLibraryElementError: Unable to find an element

i can't get the test id within my jest test. I am new to react testing. I want to test this component and get back for example the h3 text what was given before. Tells me: "TestingLibraryElementError: Unable to find an element by:…
MrGrashopper
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1 answer

Can't get TreeView Icons and IconButton for Tests

I'm trying to test a component that has an endAdornment IconButton and other with a TreeView, but neither the IconButton and the ExpandIcon/CollapseIcon have good options to dispatch test events. This is the TextField component that I'm…
mayconbelfort
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1 answer

How to add '@testing-library/jest-dom' globally?

I saw in a project using create-react-app a file named setupTest.js which just imports @testing-library/jest-dom and the tests seems to use the extented expect version, like .toBeInTheDocument. I added the same file (setupTest.js) to my project but…
Rodrigo
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1 answer

Svelte testing library won't detect component updates

My component: