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How to use beforeEqualValue method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

base64String.spec.ts

Source:base64String.spec.ts

1import * as fc from 'fast-check';2import { base64String } from '../../../src/arbitrary/base64String';3import {4  assertProduceValuesShrinkableWithoutContext,5  assertProduceCorrectValues,6  assertProduceSameValueGivenSameSeed,7} from './__test-helpers__/ArbitraryAssertions';8import * as ArrayMock from '../../../src/arbitrary/array';9import { fakeArbitrary } from './__test-helpers__/ArbitraryHelpers';10import { Value } from '../../../src/check/arbitrary/definition/Value';11import { buildShrinkTree, renderTree } from './__test-helpers__/ShrinkTree';12import { sizeForArbitraryArb } from './__test-helpers__/SizeHelpers';13function beforeEachHook() {14  jest.resetModules();15  jest.restoreAllMocks();16  fc.configureGlobal({ beforeEach: beforeEachHook });17}18beforeEach(beforeEachHook);19describe('base64String', () => {20  it('should accept any constraints accepting at least one length multiple of 4', () =>21    fc.assert(22      fc.property(23        fc.nat({ max: 5 }),24        fc.integer({ min: 3, max: 30 }),25        fc.boolean(),26        fc.boolean(),27        (min, gap, withMin, withMax) => {28          // Arrange29          const constraints = { minLength: withMin ? min : undefined, maxLength: withMax ? min + gap : undefined };30          // Act / Assert31          expect(() => base64String(constraints)).not.toThrowError();32        }33      )34    ));35  it('should reject any constraints not accepting at least one length multiple of 4', () =>36    fc.assert(37      fc.property(fc.nat({ max: 30 }), fc.nat({ max: 2 }), (min, gap) => {38        // Arrange39        const constraints = { minLength: min, maxLength: min + gap };40        let includesMultipleOf4 = false;41        for (let acceptedLength = constraints.minLength; acceptedLength <= constraints.maxLength; ++acceptedLength) {42          includesMultipleOf4 = includesMultipleOf4 || acceptedLength % 4 === 0;43        }44        fc.pre(!includesMultipleOf4);45        // Act / Assert46        expect(() => base64String(constraints)).toThrowError();47      })48    ));49  it('should always query for arrays that will produce length fitting the requested range', () =>50    fc.assert(51      fc.property(52        fc.nat({ max: 30 }),53        fc.integer({ min: 3, max: 30 }),54        fc.boolean(),55        fc.boolean(),56        (min, gap, withMin, withMax) => {57          // Arrange58          const constraints = { minLength: withMin ? min : undefined, maxLength: withMax ? min + gap : undefined };59          const array = jest.spyOn(ArrayMock, 'array');60          const { instance: arrayInstance, map } = fakeArbitrary();61          array.mockReturnValue(arrayInstance);62          map.mockReturnValue(arrayInstance); // fake map63          // Act64          base64String(constraints);65          // Assert66          expect(array).toHaveBeenCalledTimes(1);67          const constraintsOnArray = array.mock.calls[0][1]!;68          const rounded4 = (value: number) => {69            switch (value % 4) {70              case 0:71                return value;72              case 1:73                return value;74              case 2:75                return value + 2;76              case 3:77                return value + 1;78            }79          };80          if (constraints.minLength !== undefined) {81            expect(constraintsOnArray.minLength).toBeDefined();82            expect(rounded4(constraintsOnArray.minLength!)).toBeGreaterThanOrEqual(constraints.minLength);83          }84          if (constraints.maxLength !== undefined) {85            expect(constraintsOnArray.maxLength).toBeDefined();86            expect(rounded4(constraintsOnArray.maxLength!)).toBeLessThanOrEqual(constraints.maxLength);87          }88          if (constraintsOnArray.minLength !== undefined && constraintsOnArray.maxLength !== undefined) {89            expect(constraintsOnArray.maxLength).toBeGreaterThanOrEqual(constraintsOnArray.minLength);90          }91        }92      )93    ));94  it('should always forward constraints on size to the underlying arbitrary when provided', () =>95    fc.assert(96      fc.property(97        fc.nat({ max: 5 }),98        fc.integer({ min: 3, max: 30 }),99        fc.boolean(),100        fc.boolean(),101        sizeForArbitraryArb,102        (min, gap, withMin, withMax, size) => {103          // Arrange104          const constraints = {105            minLength: withMin ? min : undefined,106            maxLength: withMax ? min + gap : undefined,107            size,108          };109          const array = jest.spyOn(ArrayMock, 'array');110          const { instance: arrayInstance, map } = fakeArbitrary();111          array.mockReturnValue(arrayInstance);112          map.mockReturnValue(arrayInstance); // fake map113          // Act114          base64String(constraints);115          // Assert116          expect(array).toHaveBeenCalledWith(expect.anything(), expect.objectContaining({ size }));117        }118      )119    ));120});121describe('base64String (integration)', () => {122  type Extra = { minLength?: number; maxLength?: number };123  const extraParameters: fc.Arbitrary<Extra> = fc124    .tuple(fc.nat({ max: 30 }), fc.integer({ min: 3, max: 30 }), fc.boolean(), fc.boolean())125    .map(([min, gap, withMin, withMax]) => ({126      minLength: withMin ? min : undefined,127      // Minimal gap=3 to ensure we have at least one possible multiple of 4 between min and max128      maxLength: withMax ? min + gap : undefined,129    }));130  const isCorrect = (value: string, extra: Extra) => {131    if (extra.minLength !== undefined) {132      expect(value.length).toBeGreaterThanOrEqual(extra.minLength);133    }134    if (extra.maxLength !== undefined) {135      expect(value.length).toBeLessThanOrEqual(extra.maxLength);136    }137    const padStart = value.indexOf('=');138    const beforeEqualValue = value.substr(0, padStart === -1 ? value.length : padStart);139    const afterEqualValue = value.substr(padStart === -1 ? value.length : padStart);140    for (const c of beforeEqualValue.split('')) {141      expect('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+/'.split('')).toContainEqual(c);142    }143    expect(['', '=', '==']).toContainEqual(afterEqualValue);144  };145  const base64StringBuilder = (extra: Extra) => base64String(extra);146  it('should produce the same values given the same seed', () => {147    assertProduceSameValueGivenSameSeed(base64StringBuilder, { extraParameters });148  });149  it('should only produce correct values', () => {150    assertProduceCorrectValues(base64StringBuilder, isCorrect, { extraParameters });151  });152  it('should produce values seen as shrinkable without any context', () => {153    assertProduceValuesShrinkableWithoutContext(base64StringBuilder, { extraParameters });154  });155  // assertShrinkProducesSameValueWithoutInitialContext is not applicable for base64String has some values will not shrink exactly the same way.156  // For instance: 'abcde' will be mapped to 'abcd', with default shrink it will try to shrink from 'abcde'. With context-less one it will start from 'abcd'.157  it.each`158    source                               | constraints159    ${'0123ABC==' /* invalid base 64 */} | ${{}}160    ${'AB==' /* not large enough */}     | ${{ minLength: 5 }}161    ${'0123AB==' /* too large */}        | ${{ maxLength: 7 }}162  `('should not be able to generate $source with fc.base64String($constraints)', ({ source, constraints }) => {163    // Arrange / Act164    const arb = base64String(constraints);165    const out = arb.canShrinkWithoutContext(source);166    // Assert167    expect(out).toBe(false);168  });169  it.each`170    rawValue171    ${'ABCD'}172    ${'0123AB=='}173    ${'01230123012301230123AB=='}174    ${'ABCD'.repeat(50)}175  `('should be able to shrink $rawValue', ({ rawValue }) => {176    // Arrange177    const arb = base64String();178    const value = new Value(rawValue, undefined);179    // Act180    const renderedTree = renderTree(buildShrinkTree(arb, value, { numItems: 100 })).join('\n');181    // Assert182    expect(arb.canShrinkWithoutContext(rawValue)).toBe(true);183    expect(renderedTree).toMatchSnapshot();184  });...

Using AI Code Generation

1const fc = require("fast-check");2const { beforeEqualValue } = require("fast-check/lib/check/arbitrary/BeforeEqualValueArbitrary");3const { beforeValue } = require("fast-check/lib/check/arbitrary/BeforeValueArbitrary");4const { compare } = require("fast-check/lib/check/arbitrary/ComparableValueArbitrary");5const { convertFromNext } = require("fast-check/lib/check/arbitrary/definition/Converters");6const { convertToNext } = require("fast-check/lib/check/arbitrary/definition/Converters");7const { integer } = require("fast-check/lib/check/arbitrary/IntegerArbitrary");8const { nextValue } = require("fast-check/lib/check/arbitrary/Nex

Using AI Code Generation

1const { beforeEqualValue } = require('fast-check');2const { Arbitrary } = require('fast-check/lib/src/check/arbitrary/definition/Arbitrary');3const { Random } = require('fast-check/lib/src/random/generator/Random');4const { integer } = require('fast-check/lib/src/arbitrary/integer');5const arb = integer(0, 10);6const eq = (a, b) => a === b;7const eq2 = (a, b) => a === b && a % 2 === 0;8const eq3 = (a, b) => a === b && a % 2 !== 0;9const eq4 = (a, b) => a === b && a % 3 === 0;10beforeEqualValue(arb, eq, 1)11  .generate(new Random())12  .then(value => console.log(value));13beforeEqualValue(arb, eq2, 2)14  .generate(new Random())15  .then(value => console.log(value));16beforeEqualValue(arb, eq3, 3)17  .generate(new Random())18  .then(value => console.log(value));19beforeEqualValue(arb, eq4, 4)20  .generate(new Random())21  .then(value => console.log(value));22beforeEqualValue(arb, eq, 5)23  .generate(new Random())24  .then(value => console.log(value));25beforeEqualValue(arb, eq2, 6)26  .generate(new Random())27  .then(value => console.log(value));28beforeEqualValue(arb, eq3, 7)29  .generate(new Random())30  .then(value => console.log(value));31beforeEqualValue(arb, eq4, 8)32  .generate(new Random())33  .then(value => console.log(value));34beforeEqualValue(arb, eq, 9)35  .generate(new Random())36  .then(value => console.log(value));37beforeEqualValue(arb, eq2, 10)38  .generate(new Random())

Using AI Code Generation

1import * as fc from 'fast-check';2import { beforeEqualValue } from 'fast-check-monorepo';3const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer());4const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer(), fc.integer());5const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer(), fc.integer());6const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer(), fc.integer());7const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer(), fc.integer());8const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer(), fc.integer());9const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer(), fc.integer());10const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer(), fc.integer());11const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer(), fc.integer());12const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer(), fc.integer());13const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer(), fc.integer());14const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer(), fc.integer());15const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer(), fc.integer());16const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer(), fc.integer());17const beforeEqualValueArbitrary = beforeEqualValue(fc.integer(), fc.integer(), fc.integer());

Using AI Code Generation

1const { beforeEqualValue } = require('fast-check-monorepo');2const fc = require('fast-check');3const { beforeEqualValue } = require('fast-check-monorepo');4fc.assert(5  fc.property(fc.integer(), fc.integer(), (a, b) => {6    const before = beforeEqualValue(a, b);7    return before === a || before === b;8  }),9  { verbose: true }10);11jest.mock('fast-check-monorepo', () => ({12  beforeEqualValue: jest.fn()13}));14jest.mock('fast-check-monorepo', () => {15  return {16    beforeEqualValue: jest.fn()17  };18});19jest.mock('fast-check-monorepo', () => {20  return jest.fn().mockImplementation(() => {21    return {22      beforeEqualValue: jest.fn()23    };24  });25});26jest.mock('fast-check-monorepo', () => {27  return jest.fn().mockImplementation(() => {28    return {29      beforeEqualValue: jest.fn()30    };31  });32});33jest.mock('fast-check-monorepo', () => {34  return jest.fn().mockImplementation(() => {35    return {36      beforeEqualValue: jest.fn()37    };38  });39});40jest.mock('fast-check-monorepo', () => {41  return jest.fn().mockImplementation(() => {42    return {43      beforeEqualValue: jest.fn()44    };45  });46});47jest.mock('fast-check-monorepo', () => {48  return jest.fn().mockImplementation(() => {49    return {50      beforeEqualValue: jest.fn()51    };52  });53});54jest.mock('fast-check-monorepo', () => {55  return jest.fn().mockImplementation(() => {56    return {57      beforeEqualValue: jest.fn()58    };59  });60});

Using AI Code Generation

1import fc from 'fast-check';2import { beforeEqualValue } from 'fast-check-monorepo';3const arb = fc.integer();4const arb2 = beforeEqualValue(arb, 10);5const arb3 = beforeEqualValue(arb2, 10, 5);6import fc from 'fast-check';7const arb = fc.integer();8const arb2 = arb.filter((i) => i <= 10);9const arb3 = arb2.filter((i) => i <= 5);10import { Arbitrary } from './definition/Arbitrary';11import { ArbitraryWithShrink } from './definition/ArbitraryWithShrink';12import { Shrinkable } from './definition/Shrinkable';13import { integer } from './integer';14import { shrinkNumber } from './shrinkers/Number';15import { shrinkToDepth } from './shrinkers/ShrinkToDepth';16import { shrinkToSmallestValue } from './shrinkers/ShrinkToSmallestValue';17import { shrinkToZero } from './shrinkers/ShrinkToZero';18import { shrinkWrap } from './shrinkers/ShrinkWrap';19import { shrinkWrapToDepth } from './shrinkers/ShrinkWrapToDepth';20import { shrinkWrapToSmallestValue } from './shrinkers/ShrinkWrapToSmallestValue';21import { shrinkWrapToZero } from './shrinkers/ShrinkWrapToZero';22 * For integers between `maxValue` and `minValue` (included)23export function beforeEqualValue(24): ArbitraryWithShrink<number> {25  if (minValue == null) {26    minValue = Number.NEGATIVE_INFINITY;27  }28  return new ArbitraryWithShrink(29    () =>30      new Shrinkable(integer(minValue, maxValue).generate(), (v) =>31        shrinkToSmallestValue(v, (v) => v - 1, (v) => v >= minValue)32    (v)

Using AI Code Generation

1const fc = require('fast-check');2console.log(fc.beforeEqualValue(1, 10));3const fc2 = require('fast-check/lib/fast-check-default');4console.log(fc2.beforeEqualValue(1, 10));5const fc3 = require('fast-check-esm/lib/fast-check-default');6console.log(fc3.beforeEqualValue(1, 10));7const fc4 = require('fast-check-esm-bundle/lib/fast-check-default');8console.log(fc4.beforeEqualValue(1, 10));9const fc5 = require('fast-check-bundle/lib/fast-check-default');10console.log(fc5.beforeEqualValue(1, 10));11const fc6 = require('fast-check-esm-bundle.min/lib/fast-check-default');12console.log(fc6.beforeEqualValue(1, 10));13const fc7 = require('fast-check-bundle.min/lib/fast-check-default');14console.log(fc7.beforeEqualValue(1, 10));15const fc8 = require('fast-check-esm.min/lib/fast-check-default');16console.log(fc8.beforeEqualValue(1, 10));17const fc9 = require('fast-check.min/lib/fast-check-default');18console.log(fc9.beforeEqualValue(1, 10));19const fc10 = require('fast-check-esm-bundle.min/lib/fast-check-default');20console.log(fc10.beforeEqualValue(1, 10));21const fc11 = require('fast-check-bundle.min/lib/fast-check-default');22console.log(fc11.beforeEqualValue(1, 10));23const fc12 = require('fast-check-esm.min/lib/fast-check-default');24console.log(fc12.beforeEqualValue(1,

Using AI Code Generation

1const { beforeEqualValue } = require('fast-check');2const { returnNumber } = require('./index.js');3test('returns a number', () => {4  expect(returnNumber()).toBeInstanceOf(Number);5});6test('returns a number', () => {7  beforeEqualValue(() => returnNumber(), (a, b) => {8    expect(a).toBe(b);9  });10});11const returnNumber = () => {12  return 1;13};14module.exports = { returnNumber };15module.exports = {16};17{18  "scripts": {19  },20  "devDependencies": {21  }22}23{24  "compilerOptions": {25  }26}

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