KaneAI - World’s First E2E Software Testing Agent.Book a Demo Join TestMu Conference

How to use namedMatchers method in jest-extended

Best JavaScript code snippet using jest-extended

index.test.js

Source:index.test.js

1import * as fs from 'fs';2import * as path from 'path';3import * as matchers from 'src/matchers/index';4expect.extend(matchers);5// This does not test all matchers, just couple random ones to check6// if imports work correctly.7describe('positive matcher', () => {8  test('.toBeEven', () => {9    expect(2).toBeEven();10  });11});12describe('negative matcher', () => {13  test('.not.toBeWithin', () => {14    expect(1).not.toBeWithin(10, 20);15  });16});17describe('asymmetric matchers', () => {18  describe('positive matchers', () => {19    test('.toSatisfy', () => {20      expect(4).toEqual(expect.toSatisfy(num => num === 4));21    });22    test('.toEqual', () => {23      expect([]).toEqual(expect.toBeArray());24    });25  });26  describe('negative matchers', () => {27    test('not.toInclude', () => {28      const data = 'bob';29      expect(data).not.toEqual(expect.toInclude('alice'));30      expect(data).toEqual(expect.not.toInclude('alice'));31    });32    test('not.toContainKey', () => {33      const data = { hello: 'world' };34      expect(data).not.toEqual(expect.toContainKey('foo'));35      expect('bob').toEqual(expect.not.toInclude('foo'));36    });37  });38});39describe('all matchers', () => {40  test('must be exported', () => {41    const directories = fs.readdirSync(path.join(__dirname, '../../src/matchers')).filter(n => n !== 'index.js');42    const namedMatchers = Object.keys(matchers);43    try {44      expect(namedMatchers).toHaveLength(directories.length);45    } catch (error) {46      const missing = new Set(directories.filter(dir => !namedMatchers.includes(dir)));47      console.error('Missing', missing);48      throw error;49    }50  });51  describe('must be functions', () => {52    test.each(Object.entries(matchers))('%s', (_, matcher) => {53      expect(typeof matcher).toBe('function');54    });55  });...

Using AI Code Generation

1expect.extend({2  toBeDivisibleBy(received, argument) {3    const pass = received % argument === 0;4    if (pass) {5      return {6        message: () =>7          `expected ${received} not to be divisible by ${argument}`,8      };9    } else {10      return {11        message: () =>12          `expected ${received} to be divisible by ${argument}`,13      };14    }15  },16});17test('2 is divisible by 1', () => {18  expect(2).toBeDivisibleBy(1);19});20test('2 is divisible by 1', () => {21  expect(2).not.toBeDivisibleBy(1);22});

Using AI Code Generation

1const { namedMatchers } = require('jest-extended');2const { toBeOneOf } = require('jest-extended/dist/matchers/toBeOneOf');3namedMatchers({4});5test('test toBeOneOf', () => {6    expect(1).toBeOneOf([1, 2, 3]);7});8const { namedMatchers } = require('jest-extended');9const { toBeOneOf } = require('jest-extended/dist/matchers/toBeOneOf');10namedMatchers({11});12test('test toBeOneOf', () => {13    expect(1).toBeOneOf([1, 2, 3]);14});15const { namedMatchers } = require('jest-extended');16const { toBeOneOf } = require('jest-

Using AI Code Generation

1const { namedMatchers } = require('jest-extended');2const { toBeWithinRange } = require('jest-matcher-utils');3namedMatchers.add('toBeWithinRange', toBeWithinRange);4expect.extend(namedMatchers);5describe('test case', () => {6    test('test', () => {7        expect(1).toBeWithinRange(0, 2);8    });9});10const { namedMatchers } = require('jest-extended');11const { toHaveLength } = require('jest-matcher-utils');12namedMatchers.add('toHaveLength', toHaveLength);13expect.extend(namedMatchers);14test('test', () => {15    const list = [1, 2, 3];16    expect(list).toHaveLength(3);17});18expect(list).to.have.lengthOf(3);19expect(list).toHaveLength(3);20TypeError: expect(...).toHaveLength is not a function21expect(list).toHaveLength(3);22TypeError: expect(...).toHaveLength is not a function23const { namedMatchers } = require('jest-extended');24const { toBeWithinRange } = require('jest-matcher-utils');25namedMatchers.add('toBeWithinRange', toBeWithinRange);26expect.extend(namedMatchers);27describe('test case', () => {28    test('test', () => {29        expect(1).toBeWithinRange(0, 2);30    });31});

Using AI Code Generation

1const { namedMatchers } = require('jest-extended');2expect.extend(namedMatchers);3test('test', () => {4  const arr = [1, 2, 3];5  expect(arr).toBeArray();6});7const { namedMatchers } = require('jest-extended');8expect.extend(namedMatchers);9test('test', () => {10  const arr = [1, 2, 3];11  expect(arr).toBeArray();12});13const { namedMatchers } = require('jest-extended');14expect.extend(namedMatchers);15test('test', () => {16  const arr = [1, 2, 3];17  expect(arr).toBeArray();18});19const { namedMatchers } = require('jest-extended');20expect.extend(namedMatchers);21test('test', () => {22  const arr = [1, 2, 3];23  expect(arr).toBeArray();24});25const { namedMatchers } = require('jest-extended');26expect.extend(namedMatchers);27test('test', () => {28  const arr = [1, 2, 3];29  expect(arr).toBeArray();30});31const { namedMatchers } = require('jest-extended');32expect.extend(namedMatchers);33test('test', () => {34  const arr = [1, 2, 3];35  expect(arr).toBeArray();36});37const { namedMatchers } = require('jest-extended');38expect.extend(namedMatchers);39test('test', () => {40  const arr = [1, 2, 3];41  expect(arr).toBeArray();42});

Using AI Code Generation

1expect.extend({ toBeWithinRange, toBeEvenNumber });2test('test named matcher', () => {3  expect(2).toBeEvenNumber();4  expect(2).toBeWithinRange(1, 3);5});6expect.extend({ toBeWithinRange, toBeEvenNumber });7test('test named matcher', () => {8  expect(2).toBeEvenNumber();9  expect(2).toBeWithinRange(1, 3);10});

Using AI Code Generation

1const { toMatchOneOf } = require('jest-extended');2expect.extend({ toMatchOneOf });3test('test toMatchOneOf', () => {4    const value = 'abc';5    expect(value).toMatchOneOf(['abc', 'def']);6});7  ✓ test toMatchOneOf (1ms)8test('test toMatchOneOf', () => {9    const value = 'abc';10    expect(value).toMatchOneOf(['abc', 'def']);11});12test('test toMatchOneOf', () => {13    const value = 'abc';14    expect(value).toMatchOneOf(['abc', 'def']);15});16test('test toMatchOneOf', () => {17    const value = 'abc';18    expect(value).toMatchOneOf(['abc', 'def']);19});20test('test toMatchOneOf', () => {

Using AI Code Generation

1import 'jest-extended';2test('test', () => {3  expect('abc').toStartWith('a');4});5    /Users/abc/test.js: Unexpected token (2:8)6    > 2 | import 'jest-extended';7      4 | test('test', () => {8      5 |   expect('abc').toStartWith('a');9      at Parser.pp$5.raise (node_modules/babylon/lib/index.js:4454:13)10      at Parser.pp.unexpected (node_modules/babylon/lib/index.js:1761:8)11      at Parser.pp$1.parseImport (node_modules/babylon/lib/index.js:2238:10)12      at Parser.pp$1.parseStatement (node_modules/babylon/lib/index.js:1882:19)13      at Parser.pp$1.parseBlockBody (node_modules/babylon/lib/index.js:2268:21)14      at Parser.pp$1.parseBlock (node_modules/babylon/lib/index.js:2254:8)15      at Parser.pp$1.parseStatement (node_modules/babylon/lib/index.js:1897:19)16      at Parser.pp$1.parseTopLevel (node_modules/babylon/lib/index.js:1778:21)17      at Parser.parse (node_modules/babylon/lib/index.js:1673:17)18      at Object.parse (node_modules/babylon/lib/index.js:7307:37)

Using AI Code Generation

1expect.extend({ toBeWithinRange });2describe('test.js', () => {3  it('should test the test', () => {4    expect(1).toBeWithinRange(1, 2);5  });6});

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.