score:172
you can mock the module so it returns spies and import it into your test:
import {navigationenabled, guidanceenabled} from '../../../magic/index'
jest.mock('../../../magic/index', () => ({
navigationenabled: jest.fn(),
guidanceenabled: jest.fn()
}));
then later on you can change the actual implementation using mockimplementation
navigationenabled.mockimplementation(()=> true)
//or
navigationenabled.mockreturnvalueonce(true);
and in the next test
navigationenabled.mockimplementation(()=> false)
//or
navigationenabled.mockreturnvalueonce(false);
score:9
i had a hard time getting the accepted answers to work - my equivalents of navigationenabled
and guidanceenabled
were undefined when i tried to call mockreturnvalueonce
on them.
here's what i had to do:
in ../../../magic/__mocks__/index.js
:
export const navigationenabled = jest.fn();
export const guidanceenabled = jest.fn();
in my index.test.js
file:
jest.mock('../../../magic/index');
import { navigationenabled, guidanceenabled } from '../../../magic/index';
import { functionthatreturnsvalueofnavigationenabled } from 'moduletotest';
it('is able to mock', () => {
navigationenabled.mockreturnvalueonce(true);
guidanceenabled.mockreturnvalueonce(true);
expect(functionthatreturnsvalueofnavigationenabled()).tobe(true);
});
score:36
what you want to do is
import { navigationenabled, guidanceenabled } from '../../../magic/index';
jest.mock('../../../magic/index', () => ({
navigationenabled: jest.fn(),
guidanceenabled: jest.fn()
}));
describe('test suite', () => {
it('every test', () => {
navigationenabled.mockreturnvalueonce(value);
guidanceenabled.mockreturnvalueonce(value);
});
});
you can look more about these functions here =>https://facebook.github.io/jest/docs/mock-functions.html#mock-return-values
Source: stackoverflow.com
Related Query
- how to change jest mock function return value in each test?
- How to test a return value of a mock function in jest
- How to unit test useEffect cleanUp return function using Jest and Enzyme
- Test return value of function with Jest in React
- How to mock react custom hook return value as a module with Jest
- How to test the "onChange" function who will change the value of state with the hooks
- How to set a value to an input text element of a stateless function inside a Jest test
- How to test return function value
- How to test a function call after state receive value inside expression in React function component using Jest
- How to mock a variable in ES6 Module with jest such that the actual function runs with mocked value
- Jest unit test - mock value of async function within async function
- how to mock variables inside a function in jest
- How to test class instance inside a function with Jest
- How can mock the value of a state and data in my react test
- How to replace global function while doing unit test with jest
- How fix this warrning warning Array.prototype.map() expects a return value from arrow function array-callback-return?
- Using Jest and Enzyme, how do I test a function passed in through props?
- How can i use Jest to test a function inside a stateless component?
- How to make key value of map function increment for each element in JavaScript
- How to mock async function using jest framework?
- How to test with jest and typescript with types a basic react function component
- How can a function value is displayed in a HTML tag with a return value from addEventListerner click?
- Jest unit test with Luxon: how do I mock .setZone('local')
- How to check the value of a nested React component in a unit test with Enzyme and Jest
- Jest unit test - How do I call through async function in a setTimeout repeating function
- How to correctly mock function in Jest tests when using Rollup.js
- Jest mock value per test
- Jest jest.mock function with different return value
- How to test useParam() function with Jest
- How to get mock utility function with jest
More Query from same tag
- List of react-native StyleSheet properties and options
- issues with array of objects from variable in React render methodq
- jest mock file's variables and change function behaviour
- Not getting props from child component in Redux
- 404 error while sending data from React to Node?
- How to enable import autocomplete without typescript checking in a React project in VS Code
- componentDidMount() not working but hitting debugger
- How to get text content of elements in a div onClick? React.js, JavaScript
- React.js controlled text cursor focus issue
- React and Ag-Grid: populating selectcelleditor through fetch gives 'state' of undefined
- Error page in react not being linked to properly when specified
- Protect routes with React Router v6 and API Call
- JSX vs component class instancing
- How to use React's BrowserRouter on client and Java REST API (Spring Boot) on the server?
- Nodemon and/or Hot Reloading with a Node-React Web App
- how to visible tooltip always in react slider
- React: Module parse failed: Unexpected token
- Form data not being received properly in Node.js backend
- ReactJS & Tailwind CSS - Excess scrolling with h-screen
- How to continuously add objects to nested collection in Firestore
- Socket.io connected property is always false
- Using styled component
- Typescript: Infer arguments of a callback function passed as a parameter to another function
- How can I handle browser compatibility when using modern JS and CSS frameworks?
- .htaccess - redirect between two react apps
- Should I include setState in useCallback's array of dependencies?
- Ternary operator is not working in react js render function
- weird issue with login?
- Do I need to manually define onChange handlers to populate state variables?
- Download modified excel file in react