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How to use toBeExtensible method in jest-extended

Best JavaScript code snippet using jest-extended

to-be-extensible.js

Source:to-be-extensible.js

...41 * See: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible42 *43 * @message Expect [actual] (not) to be extensible44 * @example45 *   expect({}).toBeExtensible();46 *   expect([]).toBeExtensible();47 *   expect(null).not.toBeExtensible();48 *   expect(undefined).not.toBeExtensible();49 *   expect('').not.toBeExtensible();50 *   expect(0).not.toBeExtensible();51 *   expect(true).not.toBeExtensible();52 *   expect(Object.freeze({})).not.toBeExtensible();53 *   expect(Object.freeze([])).not.toBeExtensible();54 *   expect(Object.seal({})).not.toBeExtensible();55 *   expect(Object.seal([])).not.toBeExtensible();56 *   expect(Object.preventExtensions({})).not.toBeExtensible();57 *   expect(Object.preventExtensions([])).not.toBeExtensible();58 *59 * @param {Object} ctx The test context.60 * @return {Object} The test result.61 * @since 0.5.062 */63export function toBeExtensible({actual, pp}) {64  return {65    pass: isExtensible(actual),66    message() {67      return `Expect ${pp(actual)} {{not}} to be extensible`;68    },69  };...

to-be-extensible.spec.js

Source:to-be-extensible.spec.js

...26import {assumeSeal} from '../../../detect/assume-seal.js';27import '../../../../src/index.js';28describe('toBeExtensible', () => {29  it('should not pass with primitive values', () => {30    expect(null).not.toBeExtensible();31    expect(undefined).not.toBeExtensible();32    expect('').not.toBeExtensible();33    expect(1).not.toBeExtensible();34    expect(true).not.toBeExtensible();35  });36  it('should pass with non frozen objects and array', () => {37    expect({}).toBeExtensible();38    expect([]).toBeExtensible();39  });40  it('should not pass with frozen objects and array', () => {41    assumeFreeze();42    expect(Object.freeze({})).not.toBeExtensible();43    expect(Object.freeze([])).not.toBeExtensible();44  });45  it('should not pass with sealed objects and array', () => {46    assumeSeal();47    expect(Object.seal({})).not.toBeExtensible();48    expect(Object.seal([])).not.toBeExtensible();49  });50  it('should not pass with non extensible objects and array', () => {51    assumePreventExtensions();52    expect(Object.preventExtensions({})).not.toBeExtensible();53    expect(Object.preventExtensions([])).not.toBeExtensible();54  });...

to_be_extensible.ts

Source:to_be_extensible.ts

...19 *   },20 * });21 *22 * test("passes when value is extensible", () => {23 *   expect({ a: 1 }).toBeExtensible();24 *   expect(1).not.toBeExtensible();25 * });26 * ```27 */28function toBeExtensible(actual: unknown): MatchResult {29  return {30    pass: Object.isExtensible(actual),31    expected: "extensible object",32  };33}...

Using AI Code Generation

1const { toBeExtensible } = require("jest-extended");2expect.extend({ toBeExtensible });3test("toBeExtensible", () => {4  expect(Object).toBeExtensible();5  expect(Object.prototype).toBeExtensible();6  expect({}).toBeExtensible();7  expect({ a: 1 }).toBeExtensible();8  expect(function () {}).toBeExtensible();9  expect(Object.create(null)).toBeExtensible();10  expect(Object.create({})).toBeExtensible();11  expect(Object.create(null, { a: { value: 1, writable: true } })).toBeExtensible();12  expect(Object.create({}, { a: { value: 1, writable: true } })).toBeExtensible();13  expect(Object.create(Object.prototype, { a: { value: 1, writable: true } })).toBeExtensible();14  expect(Object.create(Object.prototype, { a: { value: 1, writable: false } })).not.toBeExtensible();15  expect(Object.create(null, { a: { value: 1, writable: false } })).not.toBeExtensible();16  expect(Object.create(null, { a: { value: 1, writable: true } })).toBeExtensible();17});18  ✓ toBeExtensible (6ms)

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