I am trying to configure package.json to run test cases with similar names. In my case i have two different naming conventions,one for unit test and another for integration test. I need to run only unit test by giving a command which picks only unit test case files and same with the integration test files. un…
Tag: jestjs
How to mock the useState hook implementation so that it actually changes the state during testing
I’m trying to test a component which renders two different sub-components when its internal state changes from false to true: when it’s false it renders a button that, if pressed, changes the state from false to true and renders the other one. The other is a form that on submit does the opposite. …
How to test if component counts array length properly with Jest
I have a component that I am giving an array with objects as props to it like this: How can I test that the provided array has the correct length, for example if there are two objects in the array, the component should return two, if there is one, one, if there are none then it should return 0, how
Error: Not implemented: window.scrollTo. How do we remove this error from Jest test?
The error: Because we are using window.scrollTo(0,0). Also getting Not implemented Navigation for: window.location.replace(externa_link) same error happens with .assign. I tried googling for solutions with react-router, but all examples use some component which contains window.location. Is there a way to avoi…
How to mock dispatch in vueJs testing
I am currently performing unit tests on my application as seen. But I have a problem. How to mock or exploit the dispatch of Vuex ? My method to test : My unit test : I have a error message : Dispatch is not a function. Why ? Do you help me please ? I don’t understand why I had
TypeError: ShallowWrapper::renderProp() can only be called on custom components
I am trying to test the render props of my React component, and have followed some advice in doing so, however it is not working. Component: And my test: But I get this error message: ● › Renders a form I have not found anything online about the error message title: TypeError: ShallowWrapper::renderProp() can…
Jest – mock a named class-export in typescript
I have a node module which exports a few classes, one of which is Client, which I use to create a client (having a few APIs as methods). I’m trying to test my module which uses this node module as a dependency using Jest. However, I’ve been unable to successfully mock the one method (say search())…
Jest test: Cannot find module, in typescript component import
The path to my styled objects is correct, however not sure why I’m getting the following error: Cannot find module ‘../../shared/models’ from ‘Astronaut.tsx’ import { moonHoldings } from ‘../../shared/models’; My simple Jest test: The Astronaut component The Jest conf…
Using sinon how do I stub or fake the property of a callback
Using sinon how do I stub/fake a return value for this.lastID in the db.run function. I can fake the callback using this code: But it will fail as this.lastID is undefined. How do I overcome this? Thanks! Answer You can use stub.callsArgOn() to pass in a context value that will used as this in the callback. Y…
Jest testing with Node – Timeout – Async callback was not invoked within the 5000ms timeout specified by jest.setTimeout
I’m starting to test my code with Jest, and I can’t make a seemingly simple test to pass. I am simply trying to check if what I receive from a Maogoose database request is an object. The function fetchPosts() is working because I hooked it up with a React frontend and it is displaying the data cor…