Comments (65)
This is fantastic -- thank you, Dominik!
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This is exactly what I was looking for, thank you sir. Solid series all around, well done!
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@mauriciosoares I would appreciate a PR to the docs, maybe a small paragraph and an updated example here :)
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@TkDodo I opened a PR for that TanStack/query#2460 π€
I used pretty much the same info from that blog post, I don't see a reason to rephrase that, since it already pretty clear and concise
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Makes sense, thanks a lot!
I will try out either solution and decide if it makes more sense to have the useQuery in each getCached helper or if I will setQueryData for the tests.
Looking forward to read the rest of your react-query blog series.
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@eoghanmccarthy I think you'd need to pass them all in again, so like in your first way. But that seems more like a question on how rerender
from testing-library works.
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Thank you, this was really useful
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@eoghanmccarthy if you use mutateAsync
, you always have to catch errors manually. This is also in the docs. I prefer to just call mutate
and work with the provided onSuccess
and onError
callbacks.
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Thanks, I have seen the example repo. As far as I can tell I'm doing everything the same, but even this isn't returning me anything:
import { setupServer } from 'msw/node'; import { rest } from 'msw'; const handlers = [ rest.get('*', (req, res, ctx) => res( ctx.status(200), ctx.json({ working: 'yes please'}) ) ) ] const server = setupServer(...handlers); beforeAll(() => server.listen()); afterEach(() => server.resetHandlers()); afterAll(() => server.close()); describe('a passing test', () => { it('passes', () => { const res = await fetch('/1099'); if (res.ok) console.log(res.json()) }); });Output of console.log is Promise { }. I would expect to see { working: 'yes please' }
hi @drmeloy, res.json()
returns a Promise! You need to await it
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Hi Tk, thanks for the great post. I have a question here about react-query mutation, testing and react-router history push after a mutation.
The question is: how to test a location change with state after a react-query mutation?
Short example:
function SomeComponent() {
const history = useHistory()
const location = useLocation()
const mutation = useMutation(somefetch, {
onSuccess: (data) => history.push(`/someurl/${data.id}`, { THIS_DATA_HERE: 'SOMETHING' })
})
return (
<>
{location?.state ? <p>id: {location.state.THIS_DATA_HERE}</p> : null}
<button type="button" onClick={() => mutation.mutate({something: 'somedata'})}>create</button>
</>
)
}
If I test the route itself it goes as expected, the user just go there and the data is refreshed via tests. But if I send anything via history state, it doesn't get updated in the test for whatever reason. I don't know if it's a problem with jest, testing-library, react-router/history or react-query.
I also have made a codesandbox with a minimum test, showing it doesn't ever update the state from location (but in the browser it works as expected):
https://codesandbox.io/s/cool-goldstine-4fizo?file=/src/App.test.js
Thank you!
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interesting article, though your tests don't actually compile... "Binding element 'children' implicitly has an 'any' type.ts(7031)"
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@bsides I've re-added react-query mutations to your sandbox and it seems to work fine: https://codesandbox.io/s/friendly-brahmagupta-1dz7v?file=/src/App.test.js
maybe you can add more code until it breaks again? maybe you removed something else, too? Maybe it's because of the actual network request or so, because I've just used your promise stub for now ...
Nice, thanks for doing that. I'll try to remove everything and make a cleaner project, looks like react-query isn't the thing to be checked here, I'm more suspicious about react-router. It was just weird that removing react-query in the first example made it work. Oh well.
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Thanks a lot man. It helped a lot. I made some changes to the custom hook and now using isSuccess
and data
flag to perform the business logic. This way it has become a lot easier to mock the hook and test the component.
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@72gm it compiles fine for me π€
Yeah your repo compiles fine. I'd just tried stealing a couple of your code snippets, which didn't!
Complicated stuff getting tests to work that use React-Query! Although it didn't help I was doing a couple of foolish things!
Thank goodness you added this repo & blog... good shout on the MSW library too
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@vkostunica no, I don't think so. Try to mock as little as possible. If you provide a dehydratedState
, all the Hydrate
component does is put that state into the queryClient ...
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Idea behind this is just to support both render and rerender for components, right? I usually saw people to use wrapper
option from render
to wrap with provider.
export function renderWithClient(ui: React.ReactElement) {
const testQueryClient = createTestQueryClient()
const { rerender, ...result } = render(
<QueryClientProvider client={testQueryClient}>{ui}</QueryClientProvider>
)
return {
...result,
rerender: (rerenderUi: React.ReactElement) =>
rerender(
<QueryClientProvider client={testQueryClient}>{rerenderUi}</QueryClientProvider>
),
}
}
Like this:
https://github.com/leerob/daydrink/blob/master/test/test-utils.js
const customRender = (ui, options) =>
render(ui, {
wrapper: ChakraRenderer,
...options
});
And for wrapper props:
testing-library/react-testing-library#780 (comment)
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Yes, it does.
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I don't want to redirect in onSuccess handler for every mutation.
what's the difference between:
onClick={async () => {
await deletePost(post.id); // block redirect bellow until mutation is not resolved
await router.push(Routes.SITE.HOME);
}}
and:
onClick={() => {
deletePost(post.id, { onSuccess: () => router.push(Routes.SITE.HOME) })
}}
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@nemanjam I would stick to what hooks-testing-library says about when to use / when not to use it:
When to use this library
You're writing a library with one or more custom hooks that are not directly tied to a component
You have a complex hook that is difficult to test through component interactions
When not to use this library
Your hook is defined alongside a component and is only used there
Your hook is easy to test by just testing the components using it
so, in your case, the hook is not overly complex, and its also likely easy to test together with your component (e.g. that it's disabled initially and then enables after some user interaction), so would go with that.
I'm merely showing that you can test custom hooks with that approach, not necessarily that you should :)
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Thanks a lot Dominik
Can you take a look on that error please
https://stackoverflow.com/questions/67354617/typeerror-reactquery-default-is-not-a-constructor
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didn't know about the silence errors thing, very nice!
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The Turn off retries
tip should be in the official documentation. I spent hours trying to figure out why my query wasn't resolving using jest + enzyme, to only remember that the QueryClient has the retries configured to 3
by default...
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Great post. A section on how to test useMutation would also be appreciated.
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Great post. A section on how to test useMutation would also be appreciated.
Thanks, I'll see what I can do :)
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@TkDodo thank you for the great article!
I am wondering how you would go about testing queryClient.getQueryData()
calls. In my app I load some data on startup and then just use it from the query-cache. I would like to test components and functions that use above function.
How could I load some data into the cache?
I tried just calling the custom hook that gets the intial data in the test, but it ends up in the wrong query client. Can you think of a way on how to re-use the query client in the setup with the wrappers that you outlined above?
Would love to hear what you think about this use case for testing with the cached data.
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I am wondering how you would go about testing queryClient.getQueryData() calls. In my app I load some data on startup and then just use it from the query-cache. I would like to test components and functions that use above function.
So I wouldn't do that, because queryClient.getQueryData()
doesn't create a subscription to the queryCache. So if new data comes in, that component won't re-render on itself - only when a parent re-renders. I always advocate for: if you need data, just call useQuery
, or better yet a custom hook that wraps useQuery
. It will make sure your component works in isolation, not just if it's a child of a specific parent. This issue actually becomes apparent when you try to test it, because it can't "work alone".
If you are worried about too many background updates, you can set a staleTime
on that query. As long as the query is fresh, data will only come from the cache with useQuery
. Otherwise, you can also prop-drill data
down, which would make it explicit and also easier to test, because now it's just a prop.
How could I load some data into the cache?
If you really want that, you can just call queryClient.setQueryData()
after you've created the queryClient to prime the cache.
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@TkDodo Thank you for the feedback!
That is a really good point. The thing is that the data I am loading is kind of configuration/master data that does not change much at all. And where I was first getting the data from different endpoints I ended up bundling it all into one configuration data endpoint that gives me all the different pieces. And many components just need one specific field of that config data. That is when I started creating those getCached* helpers that use getQueryData()
and just return a specific field of the configuration data cache.
Using the wrappers from your examples how would I go about adding data for a specific test with queryClient.setQueryData()
?
How can I get access to the same instance of the query client inside the test?
Thank you again for your guidance on this!
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choosing the createWrapper
approach, I think you can do this:
const createWrapper = (someKey, someInitialData) => {
const queryClient = new QueryClient()
queryClient.setQueryData(someKey, someInitialData)
return ({ children }) => (
<QueryClientProvider client={queryClient}>{children}</QueryClientProvider>
)
}
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Hi, thanks for answering earlier questions on twitter. I just had one more. If I need to include other providers in renderWithClient do I declare them also in the return statement?
Like this:
export function renderWithClient(ui) {
const testQueryClient = createTestQueryClient();
const { rerender, ...result } = render(
<QueryClientProvider client={testQueryClient}>
<Provider store={mockedStore} context={ReactReduxContext}>
<Router history={mockMemoryHistory}>
<AuthProvider>{ui}</AuthProvider>
</Router>
</Provider>
</QueryClientProvider>
);
return {
...result,
rerender: rerenderUi =>
rerender(
<QueryClientProvider client={testQueryClient}>
<Provider store={mockedStore} context={ReactReduxContext}>
<Router history={mockMemoryHistory}>
<AuthProvider>{rerenderUi}</AuthProvider>
</Router>
</Provider>
</QueryClientProvider>
)
};
}
Or not, so like this?
export function renderWithClient(ui) {
const testQueryClient = createTestQueryClient();
const { rerender, ...result } = render(
<QueryClientProvider client={testQueryClient}>
<Provider store={mockedStore} context={ReactReduxContext}>
<Router history={mockMemoryHistory}>
<AuthProvider>{ui}</AuthProvider>
</Router>
</Provider>
</QueryClientProvider>
);
return {
...result,
rerender: rerenderUi =>
rerender(<QueryClientProvider client={testQueryClient}>{rerenderUi}</QueryClientProvider>)
};
}
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I've tried following this but it does not seem like my MSW is even running. Is there a way to confirm that the MSW is running properly? I'm not getting any errors or anything, and when I console.log my result my result.data is undefined. As far as I can tell I've followed your implementation to a T
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@drmeloy have you seen the example repo? It has working tests, so you can clone it and work from there if you want :)
You can also reach out to msw on twitter: https://twitter.com/apimocking
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Thanks, I have seen the example repo. As far as I can tell I'm doing everything the same, but even this isn't returning me anything:
import { setupServer } from 'msw/node';
import { rest } from 'msw';
const handlers = [
rest.get('*', (req, res, ctx) =>
res(
ctx.status(200),
ctx.json({ working: 'yes please'})
)
)
]
const server = setupServer(...handlers);
beforeAll(() => server.listen());
afterEach(() => server.resetHandlers());
afterAll(() => server.close());
describe('a passing test', () => {
it('passes', () => {
const res = await fetch('/1099');
if (res.ok) console.log(res.json())
});
});
Output of console.log is Promise { }. I would expect to see { working: 'yes please' }
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Oh and my setupTests.ts doesn't hold anything, just
import '@testing-library/jest-dom';
When I commented that out just for a sanity check nothing changed
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Not sure if thatβs just a typo, but you can only await
in async
functions. I can take a look at a codesandbox reproduce if you create one
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Wondering has anyone got a useMutation status 500 test working? useMutation status 200 tests are good but the tests for 500 status are causing the test to fail.
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On the question above here is the hook and test:
export const useCreateSomething = () => {
return useMutation(async () => {
const { data } = await axios.post(`/something`);
return data;
});
};
describe('query hooks', () => {
test('test 500 status', async () => {
server.use(
rest.post(`/something`, (req, res, ctx) => {
return res(ctx.status(500));
})
);
const { result, waitFor } = renderHook(() => useCreateSomething(), {
wrapper: createWrapper()
});
const { mutateAsync } = result.current;
act(() => {
mutateAsync();
});
await waitFor(() => result.current.isError);
expect(result.current.error).toBeDefined();
});
});
Looks like the expected values are resolved but the test still fails. Same pattern works good for testing errors with useQuery but useMutation has this issue.
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Seems like you have to catch the error to make the test pass. This works:
const mockOnError = jest.fn();
act(() => {
mutateAsync().catch(err => {
mockOnError(err);
});
});
await waitFor(() => result.current.isError);
expect(result.current.error).toBeDefined();
Issue is only with useMutation not useQuery
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Hi @TkDodo - do you have insights into the value of these tests ?
Does it make sense to write a test for every single one of your hooks? Or should you be testing the component that calls the hook ?
My company maintains a repo specifically for sharing hooks between multiple projects. How valuable is it to test every single hook in that repo vs simply testing the components across the repos that use that hook ?
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@Justinohallo the granularity of what you want to test is, of course, up to you. I do like integration tests most, testing complete pages with cypress.
if you have a library that exposes hooks, I think it would be good if that library would make sure that its hooks are working as intended. For example, react-query also has tests internally for hooks.
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Wondering has anyone got on how to test useMutation's onError and onSuccess ?
const useSubmitzform = ({formdata}) =>{
const {mutate} = useMutation((payload)=>{
//axios call
},
{
onError: (error)=>{
console.log(error);
},
onSuccess: (data)=>{
console.log(data);
},
}
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@Meenakshi-SR I think it depends on what you want to test by that. Just testing if the functions have been invoked doesn't sound too appealing, because that would be testing react-query internals. We do test this, e.g. here
If you show for example a custom toast notification, it might make sense to render the hook in a component and assert that the notification is really visible on the screen. If it's just logging, mocking the log function with jest and asserting that it has been called could work.
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Really thanks for the really great articles!
few questions:
- How we could test
use mutation
hooks ? (like we test theuse query
hooks) - Do you think it's correct to set all application handlers in the same file (handlers.ts) and then initialize every test with the
server
using thesetupTest.ts
file with all that handlers? because other component we tests not using sometimes the server at all.
another note: the waitFor dosent work for me as youe example and I have to set:
await waitFor(() => expect(result.current.isSuccess).toBeTruthy());
Thanks again!
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How we could test use mutation hooks ? (like we test the use query hooks)
I think I'll have to add that to the list of things to write about. I haven't thought much about it, but I would likely do it similar to how it's done with queries - except that you'd need to interact with a button or so first to trigger the mutation. Are you struggling with something specifically?
Do you think it's correct to set all application handlers in the same file (handlers.ts) and then initialize every test with the server using the setupTest.ts file with all that handlers? because other component we tests not using sometimes the server at all.
Actually, no. I would rather set this up on a per-test level because each test might need different response data like I'm doing it here. It doesn't hurt to set some global handlers if they fit most of your cases though.
another note: the waitFor dosent work for me as youe example
interesting - it works fine in the repo I linked ...
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interesting. according to this article, what you did looks correct. I don't really see why this isn't working, but I also don't think that it's a react-query issue. You can try to remove more things like react-query to narrow it down.
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interesting. according to this article, what you did looks correct. I don't really see why this isn't working, but I also don't think that it's a react-query issue. You can try to remove more things like react-query to narrow it down.
Thanks for the reply @TkDodo
I also made a repo with v6 of react-router, there are some changes in the API and I hoped that would be some bug there, but at this point I pretty much doubt it:
https://codesandbox.io/s/thirsty-wind-duv4m?file=/src/App.tsx
I will do another one without react-query like you suggested to check one by one.
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I went in a long research for this but it looks like something about react-query
ins't right. If I remove it completely and even simulate a promise in the button click and redirect after, the test will pass.
Made another version here: https://codesandbox.io/s/qdoie?file=/src/App.tsx
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@72gm it compiles fine for me π€
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How to test properly useInfiniteQuery hook, especially when we have getNextPageParam?
getNextPageParam: (lastPage, allPages) => {
if (lastPage.length < DEFAULT_PAGE_LIMIT) {
return undefined;
}
return {
offset: allPages.flat().length
};
},
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@bsides I've re-added react-query mutations to your sandbox and it seems to work fine: https://codesandbox.io/s/friendly-brahmagupta-1dz7v?file=/src/App.test.js
maybe you can add more code until it breaks again? maybe you removed something else, too? Maybe it's because of the actual network request or so, because I've just used your promise stub for now ...
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@nazmeln if you mock the request on network layer with nock
or msw
, you can just return the same thing your real backend would return and the query should run as if it were in production, including getNextPageParam
etc.
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I have a Login component, trimmed version is like this -
The password input element is only shown after the useUserInfo
has run returned basic
as the hook output.
const Login = (props) => {
const [showPasswordField, setShowPasswordField] = useState(false);
const { userInfoQuery } = useUserInfo({
username: loginParams.username,
onSuccess: (res) => {
if (res.authSource !== 'basic') {
// Redirect to a new page
} else {
showPasswordField(true);
}
},
onError: (err) => {
showPasswordField(false);
}
});
// Conditional Login form
useUserInfo.hook.js
export const useUserInfo = (config) => {
const { userInfo } = useUserSession();
const { username, onSuccess, onError } = config;
const { refetch: userInfoQuery } = useQuery(
["userInfoQuery", username],
() => userInfo(username),
{
enabled: false,
onSuccess,
onError
});
return { userInfoQuery };
};
Now, I am trying to test the conditional render of the password input field, but it doesn't seems to be rendering. onSuccess
call is not working in the test.
Login.test.js
it("test conditional render if authSource is basic", async () => {
const userInfoQuery = jest.fn();
useUserInfo.mockImplementation((config) => ({
userInfoQuery,
data: {
authSource: "basic"
}
}));
const wrapper = renderWithTheme();
await act(async () => {
await inputFieldUsername.simulate("change", { target: { value: "[email protected]" } });
await submitButton.simulate("submit");
});
expect(userInfoQuery).toHaveBeenCalledTimes(1);
wrapper.update();
await act(async () => {
// After user has clicked on initial submit button(and has hit the useUserInfo hook), password field should become visible.
const inputFieldPasswordT2 = await wrapper.find("input#password");
console.log(inputFieldPasswordT2.debug());
expect(inputFieldPasswordT2.exists()).toBe(true);
});
I think, something is not right with my mockImplementation
. I would appreciate it if anyone could point me in the right direction.
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- I think login should always be a mutation: https://twitter.com/TkDodo/status/1483157923572457476
- you don't need state to compute the visibility of your field:
const query = useQuery()
const showPasswordField = query.isSuccess && query.data.authSource === 'basic'
not only is deriving that state much simpler and easier to grasp, it's also "safer" because onSuccess
is tied to the queryFn being run, and if you use staleTime
to retrieve cached data, you might get out of sync (not specific to your case, just a general remark).
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The final submission is going to be a Mutation only. It is just some initial checks to know who is the user and based on that what mutation needs to be called.
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Is there no way we can mock the onSuccess
? There are some more business logic that happens in onSuccess
call.
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if you create a complete mock for your custom hook (userInfoQuery
), the react-query useQuery
hook is never executed, which is likely what you want (otherwise you wouldn't have done the mock), so onSuccess
is also never called. You would have to mock useQuery
instead, but as the article states, I think its best to mock the network layer and execute all the code just like you would in production without mocking anything in code.
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@TkDodo I am trying to mock my customQuery hook but facing some overload issue
i.euseGet
const useGetMock = jest.spyOn('axios', 'get').mockImplementation(() => mockSuccess );
below is the method defined
endpoint: string,
headers: Record<string, string>,
opts?: queryOptions
) : UseQueryResult<string> {
return useQuery(
['get', endpoint, headers || ''],
() => apiClient(endpoint, Method.GET, headers),
opts
);
}
test-case
//Arrange
const { result } = renderHook(() => useGet('https://run.mocky.io/v3/f042917b-d3a7-41ec-acb2-7b25a37326b2', {}), {
wrapper: createWrapper(),
});
const useGetMock = jest.spyOn(useGet, 'fetch').mockImplementation(() => Promise.resolve(mockSuccess) );
const { container } = render(
<ThemeProvider theme={jiffy}>
<QueryClientProvider client={queryClient}>
<ClientList id="1" />
</QueryClientProvider>
</ThemeProvider>
);
screen.debug();
//Act
const clientList = screen.getByTestId("client-list")
//Assert
expect(useGetMock).toHaveBeenCalled();
expect(clientList).toBeInTheDocument()
});
error :
Overload 1 of 4, '(object: (endpoint: string, headers: Record<string, string>, opts?: queryOptions) => UseQueryResult<string, unknown>, method: never): SpyInstance<never, never>', gave the following error.
Argument of type 'string' is not assignable to parameter of type 'never'.
Overload 2 of 4, '(object: (endpoint: string, headers: Record<string, string>, opts?: queryOptions) => UseQueryResult<string, unknown>, method: never): SpyInstance<never, never>', gave the following error.
Argument of type 'string' is not assignable to parameter of type 'never'```
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@iamravisingh can't tell from just that code snippet, sorry. Again, my advice is to not spy on methods, but mock the network request itself. I can take a look if you have a codesandbox reproduction that shows the error.
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What about Hydrate
provider that is used with Next.js and SSR, should it's state be mocked in some way too?
import { Hydrate, QueryClient, QueryClientProvider } from 'react-query';
<QueryClientProvider client={queryClient}>
<Hydrate state={dehydratedState}>
<Component {...pageProps} />
</Hydrate>
<ReactQueryDevtools />
</QueryClientProvider>
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does wrapper
also handle rerender
? I didn't know that ...
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@eoghanmccarthy if you use
mutateAsync
, you always have to catch errors manually. This is also in the docs. I prefer to just callmutate
and work with the providedonSuccess
andonError
callbacks.
What if I want to block redirect bellow until mutation is not resolved, regular mutate is sync and returns void
? I don't want to handle mutation error on another page. I don't want to redirect in onSuccess
handler for every mutation.
const { mutateAsync: deletePost, ...restDelete } = useDeletePost();
...
<Button
variant="secondary"
onClick={async () => {
await deletePost(post.id); // block redirect bellow until mutation is not resolved
await router.push(Routes.SITE.HOME);
}}
>
{!restDelete.isLoading || isFetching ? 'Delete' : 'Deleting...'}
</Button>
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I don't want to redirect in onSuccess handler for every mutation.
what's the difference between:
onClick={async () => { await deletePost(post.id); // block redirect bellow until mutation is not resolved await router.push(Routes.SITE.HOME); }}
and:
onClick={() => { deletePost(post.id, { onSuccess: () => router.push(Routes.SITE.HOME) }) }}
So I can pass onSuccess
inline as option, great then, thank you.
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Very clean example, I am using it in my project. Although one thing confuses me, which is what actual logic/code is being tested here?
In your example there is literally no custom logic to be tested, libraries do all the work.
const fetchRepoData = (): Promise<{ name: string }> =>
axios
.get('https://api.github.com/repos/tannerlinsley/react-query')
.then((response) => response.data)
export function useRepoData() {
return useQuery('repoData', fetchRepoData)
}
If I use one random, more realistic hook from my project, there is also almost no custom logic. How such tests add any value to the project? What logic is aimed to be tested?
const getUser = async (params: GetUserQueryParams) => {
const { data } = await axiosInstance.get<ClientUser>(Routes.API.PROFILE, { params });
return data;
};
export const useUser = (params: GetUserQueryParams) => {
const subKey = params?.username || params?.email || params?.id;
const query = useQuery<ClientUser, AxiosError>(
filterEmpty([QueryKeys.USER, subKey]),
() => getUser(params),
{ enabled: !!subKey }
);
return query;
};
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Is there a good example of a container/smart component using useQuery
?
When I test the basic example component here: https://react-query.tanstack.com/overview
mocked out with data using msw, the markup does not load.
If I do the same API call with the native react useEffect
hook instead, the markup appears and can be used to find elements and expect values on.
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@apasternack I think I have an example for that in the linked repo:
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@TkDodo Thanks that helped, got my test working following that pattern
I still don't understand why when you test a container/smart component that directly uses useQuery the markup of the component under test never loads. This issue goes away when wrapping useQuery in a custom hook, but I am unclear on why that is the case.
Thanks!
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