Skip to content

masterclassBuddy Tech Buzz5 fresh blogs · 5:00 AM IST

Sign in Start learning

API reference

Jest API reference

Jest unit testing

Identifiers: 104
With full guides: 0
Types: 4

Topics covered

Matchers
Mocks & spies
Module mocks
Async tests
Setup / teardown
Snapshot testing
Coverage
Fake timers

Function

Name	What it does
`describe`	Function
`test`	Function
`expect`	Function
`beforeEach`	Function
`afterEach`	Function
`jest.fn`	Function
`jest.mock`	Function
`jest.spyOn`	Function
`toEqual`	Function
`toHaveBeenCalled`	Function
`beforeAll`	Function
`afterAll`	Function
`jest.useFakeTimers`	Function
`jest.clearAllMocks`	Function
`jest.resetModules`	Function
`expect.extend`	Function
`toMatchSnapshot`	Function
`toThrow`	Function
`mockResolvedValue`	Function
`it`	Function
`test.each`	Function
`describe.each`	Function
`it.only`	Function
`it.skip`	Function
`it.todo`	Function
`test.concurrent`	Function
`xdescribe`	Function
`xit`	Function
`fit`	Function

Type Alias

Name	What it does
`jest.Mock`	Type Alias
`jest.Mocked`	Type Alias
`jest.SpyInstance`	Type Alias
`MockedFunction`	Type Alias

Module

Name	What it does
`toBe`	Module
`toStrictEqual`	Module
`toBeNull`	Module
`toBeUndefined`	Module
`toBeDefined`	Module
`toBeTruthy`	Module
`toBeFalsy`	Module
`toBeGreaterThan`	Module
`toBeGreaterThanOrEqual`	Module
`toBeLessThan`	Module
`toBeLessThanOrEqual`	Module
`toBeCloseTo`	Module
`toMatch`	Module
`toMatchObject`	Module
`toContain`	Module
`toContainEqual`	Module
`toHaveLength`	Module
`toHaveProperty`	Module
`toBeInstanceOf`	Module
`toBeNaN`	Module
`toMatchInlineSnapshot`	Module
`toHaveBeenCalledTimes`	Module
`toHaveBeenCalledWith`	Module
`toHaveBeenLastCalledWith`	Module
`toHaveBeenNthCalledWith`	Module
`toHaveReturned`	Module
`toHaveReturnedWith`	Module
`resolves`	Module
`rejects`	Module
`not`	Module
`any`	Module
`anything`	Module
`arrayContaining`	Module
`objectContaining`	Module
`stringContaining`	Module
`stringMatching`	Module
`assertions`	Module
`hasAssertions`	Module
`jest.resetAllMocks`	Module
`jest.restoreAllMocks`	Module
`jest.useRealTimers`	Module
`jest.advanceTimersByTime`	Module
`jest.runAllTimers`	Module
`jest.runOnlyPendingTimers`	Module
`jest.mocked`	Module
`jest.requireActual`	Module
`jest.requireMock`	Module
`jest.doMock`	Module
`jest.unmock`	Module
`jest.setTimeout`	Module
`jest.isolateModules`	Module
`mockReturnValue`	Module
`mockRejectedValue`	Module
`mockImplementation`	Module
`mockImplementationOnce`	Module
`mockReturnValueOnce`	Module
`mockReset`	Module
`mockClear`	Module
`mockRestore`	Module
`mockName`	Module

Pipe

Name	What it does
`testEnvironment`	Pipe
`setupFiles`	Pipe
`setupFilesAfterEach`	Pipe
`moduleNameMapper`	Pipe
`transform`	Pipe
`collectCoverage`	Pipe
`coverageThreshold`	Pipe
`testMatch`	Pipe
`preset`	Pipe
`projects`	Pipe
`globalSetup`	Pipe

Search across every package and filter by type in your dashboard.