Need to test AWS SES using jest unit testing But showing different errors, also tried solutions in another stackoverflow question The actual code to be tested is : the test file is : Its giving error message as: Answer Actually this mock works, the reason behind the error is that , i didn’t mocked the A…
Tag: jestjs
how extract value from calc function in tests
I am trying to create a test in which I want to compare the width of an element after it has been resized by dragging it. The problem is that the resize library returns the width value as The only thing that changes is this percentage value and this is what I want to compare in the test if it
React Testing with Jest and useParams-hook, tried with MemoryRouter
How do I test a component which needs the parameter from react-router to work? Carousel.js component Carousel.test.js The test works if I comment the line with useParams out and just declare const id = 1;. Then I’ve tried to use MemoryRouter. Carousel.test.js v2 And the test failed with this output It s…
In Jest, how do I cause a function called within the function to return a specific value
This is the function I am testing (stripped down for simplicity’s sake): populate.js-> The function this function calls: populate-template-utilities -> And my unit test (again stripped down): I want createSessionID to return ‘PAX123456’ and think mockID should do it, but it’s err…
How to test code with Jest that uses readonly fields on mocks of libraries (such as ws socket.readyState)?
I want to unit test this JS code with Jest. It’s using the ws websocket library: Socket.js I want to check the error is thrown. For that to happen, I create a mock for the socket and then need to set the readyState of the socket object to CLOSED. The issue is that this is impossible because it’s a…
How to store response body in supertest?
I am testing very basic REST api with supertest. I want to save the item id received in response body and assign it to a variable. Using this id i want to make further tests like get-item-by-id or update-item-by-id. No official documentation has covered this so a beginner friendly answer would be very helpful…
How do I check that the correct objects are being returned via a function (expect function returns [Function Anonymous])?
I have a function: Some data: I am currently trying to write some Jest unit tests for this, that tests if the function returns the correct resultant object after being sorted based off an attribute. The result of: sort(pets,attribute) is something like this: Is there a way I can do a expect to match the two o…
JavaScript/Node – Why isn’t my jest mock being called?
I am writing a unit test for a pubsub component in my service. My directory structure looks like this: The file publish_to_topic.ts looks like this And is called by publish_event.ts like so: Lastly in my test file publish_event.test.ts, I set up a mock: Alas, my test fails: Can anyone explain where I’ve…
Mock an axios 404 with Jest?
When mocking a 404 error the result is Uncaught UnhandledPromiseRejection: This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason “Error: error”. Setup a basic M…
Can’t mock the navigator.language
I’m currently adding unit test for some of shard utils functions. I’m kinda new to unit testing. Currently having hard time to mock some global object. Is there any way to mock/update value of navigator.language? It is always returning en-US. I tried the Object.defineProperty and different jest mo…