@std/expect@1.0.17
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denoland/std

Jest compatible `expect` assertion functions

JSR Score

94%

Published

5 months ago (1.0.17)

This module provides Jest compatible expect assertion functionality.

import { expect } from "@std/expect";

const x = 6 * 7;
expect(x).toEqual(42);
expect(x).not.toEqual(0);

await expect(Promise.resolve(x)).resolves.toEqual(42);

Currently this module supports the following functions:

Common matchers:
- toBe
- toEqual
- toStrictEqual
- toMatch
- toMatchObject
- toBeDefined
- toBeUndefined
- toBeNull
- toBeNaN
- toBeTruthy
- toBeFalsy
- toContain
- toContainEqual
- toHaveLength
- toBeGreaterThan
- toBeGreaterThanOrEqual
- toBeLessThan
- toBeLessThanOrEqual
- toBeCloseTo
- toBeInstanceOf
- toThrow
- toHaveProperty
Mock related matchers:
- toHaveBeenCalled
- toHaveBeenCalledTimes
- toHaveBeenCalledWith
- toHaveBeenLastCalledWith
- toHaveBeenNthCalledWith
- toHaveReturned
- toHaveReturnedTimes
- toHaveReturnedWith
- toHaveLastReturnedWith
- toHaveNthReturnedWith
Asymmetric matchers:
Utilities:
- expect.addSnapshotSerializer
- expect.assertions
- expect.addEqualityTester
- expect.extend
- expect.hasAssertions

Only these functions are still not available:

Matchers:
- toMatchSnapshot
- toMatchInlineSnapshot
- toThrowErrorMatchingSnapshot
- toThrowErrorMatchingInlineSnapshot

The tracking issue to add support for unsupported parts of the API is https://github.com/denoland/std/issues/3964.

This module is largely inspired by x/expect module by Allain Lalonde.

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deno add jsr:@std/expect

Import symbol

import * as expect from "@std/expect";

Import directly with a jsr specifier

import * as expect from "jsr:@std/expect";

Add Package

pnpm i jsr:@std/expect

or (using pnpm 10.8 or older)

pnpm dlx jsr add @std/expect

Import symbol

import * as expect from "@std/expect";

Add Package

yarn add jsr:@std/expect

or (using Yarn 4.8 or older)

yarn dlx jsr add @std/expect

Import symbol

import * as expect from "@std/expect";

Add Package

vlt install jsr:@std/expect

Import symbol

import * as expect from "@std/expect";

Add Package

npx jsr add @std/expect

Import symbol

import * as expect from "@std/expect";

Add Package

bunx jsr add @std/expect

Import symbol

import * as expect from "@std/expect";

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