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});

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