I am using jest with react-native to run unit test cases. And whenever it encounters Image it throws the following warning I tried to replace the code to as suggested in https://stackoverflow.com/a/36460928/3855179 but it started throwing the following warning and the application breaks Any idea how this can be handled? Answer It would be helpful to see your file structure
Tag: unit-testing
Module pattern variable returning undefined in test?
I have the following code below which returns certain data depending on NODE_ENV: config.js This works well in my component when I set NODE_ENV. However in my test, I keep getting undefined as a result. config.test.js Again, Config.data works fine in my React component when I start it up, but I guess I need to somehow initialize this for it
Issue with setting up jest mock
I have the following function that is used within cypress tests for which I want to do unit testing (filterTests.js): A test double for Cypress.env needs to be created. I’m not sure if this would technically be considered a stub, mock, fake, dummy, etc…, but the philosophical discussion isn’t the focus right now. It looks like in the Cypress world,
Test an onlyOwner function in Javascript
I have this situation in my smart contract: I’m using truffle and his test suite and then I wrote this case, that fails maybe because I’m not using the only owner method in the right way: Can someone help me? Answer Assuming that you properly set the owner in the contract, write a getter for the owner in the contract:
Checking if multiple elements are rendering using jasmine
Greetings, I am trying to write a unit test where i can test if multiple divs are getting rendered which depend on a common condition. I want to know if there is a way to do it in one test rather than writing a test for each of them individually since they all dependent on a common condition. That is,
Jest coverage tools fail
During in my react-native project, during test execution, Jest shows coverage and creates coverage reports. Jest config: During testing I get errors: in files which are generated during creation of coverage folder: So, in jest documentation we see that we can specify jsdom environment in file which produces error like: Ok, but here we have auto-generated files, not my test-files.
Jasmine testing – persistence of affixed elements and why clicks trigger more than once
Please note this is SPECIFIC to test environment using Jasmine. I am NOT having these issues in dev mode. Here’s a bare bones example I created: Code Spec code As it stands, the output in console is this: I have discovered that the reason for the redundancy in clicks is because mountTest() is called at the top-level beforeEach. Further experimentation
Angular: Unittest with async input pipe + mock service with HttpClient
I try to create a unittest for my angular component. The test case should do the following: Manipulate the input with “The” Check if the loading indicator is shown Return a mocked value from the service (which would normaly create a HttpRequest) Check if the loading indicator is hidden Check if the options of the response from the mocked service
Jest: ReferenceError: global is not defined
So I am writing unit test using “react-testing-library” on Jest and I have this error: Answer After I added “jest-environment-jsdom”: “^27.0.6” as a dev dependency, that error went away.
How to set a Sinon spy for a dependency defined in a class, rather than a Sinon stub?
I am unit testing a method defined in a module, which itself calls a dependency defined in a second module. I want to set a spy for the method-under-test’s call to the dependency, using the Sinon package. How do I do that? I’ve seen Sinon’s page on mocking the dependency of a module (see here), and have been able to