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@jest/globals

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@jest/globals


Version published
Weekly downloads
18M
decreased by-19.16%
Maintainers
3
Install size
17.4 MB
Created
Weekly downloads
 

Package description

What is @jest/globals?

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.

What are @jest/globals's main functionalities?

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);
  });
});

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Package last updated on 20 Feb 2024

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