Huge News!Announcing our $40M Series B led by Abstract Ventures.Learn More
Socket
Sign inDemoInstall
Socket

expect-more-jest

Package Overview
Dependencies
Maintainers
1
Versions
26
Alerts
File Explorer

Advanced tools

Socket logo

Install Socket

Detect and block malicious and high-risk dependencies

Install

expect-more-jest

Write Beautiful Specs with Custom Matchers for Jest

  • 5.5.0
  • latest
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
26K
decreased by-15.69%
Maintainers
1
Weekly downloads
 
Created
Source

expect-more-jest

Write Beautiful Specs with Custom Matchers for Jest

NPM version NPM downloads Build Status Maintainability Follow JamieMason on GitHub Follow fold_left on Twitter

Table of Contents

Overview

expect-more-jest is a huge library of test matchers for a range of common use-cases, to make tests easier to read and produce relevant and useful messages when they fail.

Avoid vague messages such as "expected false to be true" in favour of useful cues like "expected 3 to be even number", and avoid implementation noise such as expect(paws.length % 2 === 0).toEqual(true) in favour of simply stating that you expect(paws.length).toBeEvenNumber().

🌩 Installation

npm install expect-more-jest --save-dev

🕹 Configuration

Include one of the following at the top of your test file.

import 'expect-more-jest';
// or
require('expect-more-jest');

🔬 Matchers

describe('expect-more-jest', () => {
  it('makes your tests and output easier to read', () => {
    expect(new Date('2020-01-01')).toBeAfter(new Date('2019-12-31'));
    expect([12, 0, 14, 'Ivo']).toBeArrayIncludingAllOf(['Ivo', 14]);
    expect([12, 0, 14, 'Ginola']).toBeArrayIncludingAnyOf(['Ginola', 3]);
    expect([5, 10, 1]).toBeArrayIncludingOnly([1, 5, 10]);
    expect([true, false, new Boolean(true)]).toBeArrayOfBooleans();
    expect([12, 0, 14]).toBeArrayOfNumbers();
    expect([{}, new Object()]).toBeArrayOfObjects();
    expect(['i', 'contain', 4, 'items']).toBeArrayOfSize(4);
    expect(['we', 'are', 'all', 'strings']).toBeArrayOfStrings();
    expect([{ name: 'Guybrush' }, { name: 'Elaine' }]).toBeArrayOf({
      name: expect.toBeNonEmptyString(),
    });
    expect([2, true, 'string']).toBeArray();
    expect(async () => {
      await fetch('...');
    }).toBeAsyncFunction();
    expect(new Date('2019-12-31')).toBeBefore(new Date('2020-01-01'));
    expect(false).toBeBoolean();
    expect('100').toBeCalculable();
    expect(new Date('2019-12-11')).toBeDateBetween(new Date('2019-12-10'), new Date('2019-12-12'));
    expect(new Date('2021-08-29')).toBeDateInMonth(7);
    expect(new Date('2021-08-29')).toBeDateInYear(2021);
    expect(new Date('2021-08-29')).toBeDateOnDayOfMonth(29);
    expect(new Date('2021-08-29')).toBeDateOnDayOfWeek(0);
    expect(new Date('2019-12-31')).toBeDateOnOrAfter(new Date('2019-12-15'));
    expect(new Date('2019-12-15')).toBeDateOnOrBefore(new Date('2019-12-31'));
    expect(new Date('2019-12-31')).toBeDate();
    expect(12.55).toBeDecimalNumber();
    expect(12).toBeDivisibleBy(2);
    expect([]).toBeEmptyArray();
    expect({}).toBeEmptyObject();
    expect('').toBeEmptyString();
    expect(2).toBeEvenNumber();
    expect(false).toBeFalse();
    expect(() => 'i am a function').toBeFunction();
    expect(function* gen() {
      yield 'i am a generator';
    }).toBeGeneratorFunction();
    expect('1999-12-31T23:59:59').toBeIso8601();
    expect('{"i":"am valid JSON"}').toBeJsonString();
    expect(['i', 'have', 3]).toBeLongerThan([2, 'items']);
    expect(-18).toBeNegativeNumber();
    expect(undefined).toBeNil();
    expect(['i', 'am not empty']).toBeNonEmptyArray();
    expect({ i: 'am not empty' }).toBeNonEmptyObject();
    expect('i am not empty').toBeNonEmptyString();
    expect({ x: 12, y: 22 }).toBeNullableOf({
      x: expect.toBeNumber(),
      y: expect.toBeNumber(),
    });
    expect(null).toBeNullableOf({
      x: expect.toBeNumber(),
      y: expect.toBeNumber(),
    });
    expect(8).toBeNumber();
    expect({}).toBeObject();
    expect(5).toBeOddNumber();
    expect({ x: 12, y: 22 }).toBeOptionalOf({
      x: expect.toBeNumber(),
      y: expect.toBeNumber(),
    });
    expect(undefined).toBeOptionalOf({
      x: expect.toBeNumber(),
      y: expect.toBeNumber(),
    });
    expect(5).toBePositiveNumber();
    expect(new RegExp('i am a regular expression')).toBeRegExp();
    expect(['i also have', '2 items']).toBeSameLengthAs(['i have', '2 items']);
    expect(['i have one item']).toBeShorterThan(['i', 'have', 4, 'items']);
    expect('i am a string').toBeString();
    expect(true).toBeTrue();
    expect(new Date('2020-01-01')).toBeValidDate();
    expect('i am visible').toBeVisibleString();
    expect({}).toBeWalkable();
    expect(' ').toBeWhitespace();
    expect(8).toBeWholeNumber();
    expect(7).toBeWithinRange(0, 10);
    expect('JavaScript').toEndWith('Script');
    expect('JavaScript').toStartWith('Java');
  });
});

🙋🏽‍♂️ Getting Help

Get help with issues by creating a Bug Report or discuss ideas by opening a Feature Request.

👀 Other Projects

If you find my Open Source projects useful, please share them ❤️

🤓 Author

I'm Jamie Mason from Leeds in England, I began Web Design and Development in 1999 and have been Contracting and offering Consultancy as Fold Left Ltd since 2012. Who I've worked with includes Sky Sports, Sky Bet, Sky Poker, The Premier League, William Hill, Shell, Betfair, and Football Clubs including Leeds United, Spurs, West Ham, Arsenal, and more.

Follow JamieMason on GitHub Follow fold_left on Twitter

Keywords

FAQs

Package last updated on 31 Jan 2023

Did you know?

Socket

Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.

Install

Related posts

SocketSocket SOC 2 Logo

Product

  • Package Alerts
  • Integrations
  • Docs
  • Pricing
  • FAQ
  • Roadmap
  • Changelog

Packages

npm

Stay in touch

Get open source security insights delivered straight into your inbox.


  • Terms
  • Privacy
  • Security

Made with ⚡️ by Socket Inc