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@jest/globals
Advanced tools
The @jest/globals package provides access to Jest's global variables and functions, making it easier to write tests by providing a consistent testing environment. This package is particularly useful when working with ES modules, where Jest's globals are not automatically available. It includes functionalities such as test definition, mocking, and assertions.
Defining tests
Allows the definition of test cases. The `test` function is used to define a block of code that tests a specific part of your application. The `expect` function is used to make an assertion about a particular value.
import { test, expect } from '@jest/globals';
test('adds 1 + 2 to equal 3', () => {
expect(1 + 2).toBe(3);
});
Mocking functions
Enables the mocking of functions, allowing you to simulate the behavior of your code's dependencies. This is useful for isolating the code under test and controlling its environment.
import { jest } from '@jest/globals';
const mockFn = jest.fn();
mockFn.mockReturnValue('mocked value');
expect(mockFn()).toBe('mocked value');
Grouping tests
Provides a way to group related tests using the `describe` function. This helps in organizing tests, especially when testing complex applications.
import { describe, test, expect } from '@jest/globals';
describe('math operations', () => {
test('adds 1 + 2 to equal 3', () => {
expect(1 + 2).toBe(3);
});
test('subtracts 2 - 1 to equal 1', () => {
expect(2 - 1).toBe(1);
});
});
Mocha is a feature-rich JavaScript test framework running on Node.js and in the browser, making asynchronous testing simple. It's similar to @jest/globals in providing a testing structure (describe and it blocks), but it requires additional libraries like Chai for assertions and Sinon for spies, mocks, and stubs.
Chai is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any javascript testing framework. It's similar to the assertion part of @jest/globals, offering a range of assertions via expect, should, and assert interfaces. However, it does not provide test runner or mocking capabilities.
Sinon provides standalone test spies, stubs, and mocks for JavaScript. Works with any unit testing framework. It's similar to the mocking functionality of @jest/globals but is focused solely on the aspect of mocking, without an integrated test runner or assertion library.
29.1.0
[expect, @jest/expect]
Support type inference for function parameters in CalledWith
assertions (#13268)[expect, @jest/expect]
Infer type of *ReturnedWith
matchers argument (#13278)[@jest/environment, jest-runtime]
Allow jest.requireActual
and jest.requireMock
to take a type argument (#13253)[@jest/environment]
Allow jest.mock
and jest.doMock
to take a type argument (#13254)[@jest/fake-timers]
Add jest.now()
to return the current fake clock time (#13244, #13246)[@jest/mock]
Add withImplementation
method for temporarily overriding a mock (#13281)[expect]
Export toThrow*
matchers (#13328)[jest-circus, jest-jasmine2]
Fix error messages for Node's assert.throes
(#13322)[jest-haste-map]
Remove __proto__
usage (#13256)[jest-mock]
Improve spyOn
typings to handle optional properties (#13247)[jest-mock]
Fix mocking of getters and setters on classes (#13145)[jest-snapshot]
Throw useful error when an array is passed as property matchers (#13263)[jest-snapshot]
Prioritize parser used in the project (#13323)[jest-transform]
Attempt to work around issues with atomic writes on Windows (#11423)FAQs
Unknown package
The npm package @jest/globals receives a total of 21,717,075 weekly downloads. As such, @jest/globals popularity was classified as popular.
We found that @jest/globals demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
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