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jest-mock

**Note:** More details on user side API can be found in [Jest documentation](https://jestjs.io/docs/mock-function-api).


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What is jest-mock?

The jest-mock package is a module for mocking classes and objects in JavaScript tests. It is part of the Jest testing framework but can be used independently. It allows developers to create mock functions, spy on function calls, and set return values or implementations for testing purposes.

What are jest-mock's main functionalities?

Creating Mock Functions

This feature allows you to create a mock function that can track calls, arguments, and return values. It can be used to test how a function is used without actually executing its logic.

const mockFn = jest.fn();

Mocking Return Values

With this feature, you can set a default return value for a mock function. This is useful when you want to test the behavior of code that depends on the return value of the function being mocked.

const mockFn = jest.fn().mockReturnValue('default value');

Mocking Modules

This feature allows you to mock entire modules, which is particularly useful when you want to isolate the module being tested from its dependencies.

jest.mock('moduleName', () => { return jest.fn(() => 'mocked module') });

Spying on Methods

Spying on methods enables you to observe and track calls to object methods without affecting their actual implementation. This is useful for verifying that methods are called with the correct arguments.

const spy = jest.spyOn(object, 'methodName');

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Package last updated on 12 Sep 2023

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