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: unit-testing
Vitest mock modules function in only one test and use the actual function in others
The following is an abstraction of my problem and thus does not make too much sense: Given I have a simple utility callMethodIf that’s returning the return of another imported method (blackbox). ~~/utils/call-method-if.js: ~~/utils/blackbox.js: How would I run one test case which calls the actual implem…
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…
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…
Jest skipping S3 Get Object call in function
Im testing a standard S3 Get Object Call, but when Jest tests my function, it skips the Get Object call and jumps to end of function, ending the execution and returning nothing. When I checked code coverage, all lines are covered expect the getObject call. This is my s3 file being tested. I have checkpoints t…
Module not found even though it is imported
When I run this test: I get this error: Reissue.tsx does import ReissueService. Do I need to mock this and if so how do I do that? In Reissue my import is: and I’m exporting: In ReissueService I export: Answer I changed import { ReissueService } from ‘src/services/ReissueService/ReissueServiceR…
How to mock instance methods of a class mocked with jest.mock?
How can the instance methods be mocked for a class that is being mocked with jest.mock? For example, a class Logger is mocked: Answer Automatic Mocking Calling jest.mock automatically mocks all the exports from the module being mocked unless a manual mock is specified using the __mocks__ directory. So, this l…
Debugging jest mocks
I’ve got a library that’s giving me some trouble in my jest tests. This library is included throughout my project, and it has an annoyingFunction that has a console.error in it. So, whenever I run a test, I naturally get unwanted console.error messages all over the place. I don’t want to moc…
Is it is possible to test only one function from component with Jest?
I have react component, for example something like this: And I’m trying to write test that should looks like this: Can I mock useState, useContext and useLocation from <MyComponent/> and pass my custom data instead of real data from real component? Answer After deeper researching I’ve unders…
TypeError: Cannot read property ‘navigator’ of undefined
My unit test case started failing when I started running the unit test in mocha from karma, Earlier we were using karma and –browser to run the test case but it was running fine, Package.json test file – It fails for navigator here, TypeError: Cannot read property ‘navigator’ of undefi…