# How to use doubleConstraints method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

double.spec.ts

Source:double.spec.ts

`...35});36describe('double', () => {37 it('should accept any valid range of floating point numbers (including infinity)', () => {38 fc.assert(39 fc.property(doubleConstraints(), (ct) => {40 // Arrange41 spyArrayInt64();42 // Act43 const arb = double(ct);44 // Assert45 expect(arb).toBeDefined();46 })47 );48 });49 it('should accept any constraits defining min (not-NaN) equal to max', () => {50 fc.assert(51 fc.property(52 float64raw(),53 fc.record({ noDefaultInfinity: fc.boolean(), noNaN: fc.boolean() }, { withDeletedKeys: true }),54 (f, otherCt) => {55 // Arrange56 fc.pre(!Number.isNaN(f));57 spyArrayInt64();58 // Act59 const arb = double({ ...otherCt, min: f, max: f });60 // Assert61 expect(arb).toBeDefined();62 }63 )64 );65 });66 it('should reject NaN if specified for min', () => {67 // Arrange68 const arrayInt64 = spyArrayInt64();69 // Act / Assert70 expect(() => double({ min: Number.NaN })).toThrowError();71 expect(arrayInt64).not.toHaveBeenCalled();72 });73 it('should reject NaN if specified for max', () => {74 // Arrange75 const arrayInt64 = spyArrayInt64();76 // Act / Assert77 expect(() => double({ max: Number.NaN })).toThrowError();78 expect(arrayInt64).not.toHaveBeenCalled();79 });80 it('should reject if specified min is strictly greater than max', () => {81 fc.assert(82 fc.property(float64raw(), float64raw(), (da, db) => {83 // Arrange84 fc.pre(!Number.isNaN(da));85 fc.pre(!Number.isNaN(db));86 fc.pre(!Object.is(da, db)); // Object.is can distinguish -0 from 0, while !== cannot87 const arrayInt64 = spyArrayInt64();88 const min = isStrictlySmaller(da, db) ? db : da;89 const max = isStrictlySmaller(da, db) ? da : db;90 // Act / Assert91 expect(() => double({ min, max })).toThrowError();92 expect(arrayInt64).not.toHaveBeenCalled();93 })94 );95 });96 it('should reject impossible noDefaultInfinity-based ranges', () => {97 // Arrange98 const arrayInt64 = spyArrayInt64();99 // Act / Assert100 expect(() => double({ min: Number.POSITIVE_INFINITY, noDefaultInfinity: true })).toThrowError();101 expect(() => double({ max: Number.NEGATIVE_INFINITY, noDefaultInfinity: true })).toThrowError();102 expect(arrayInt64).not.toHaveBeenCalled();103 });104 if (typeof BigInt !== 'undefined') {105 it('should properly convert integer value for index between min and max into its associated float value', () => {106 fc.assert(107 fc.property(108 fc.option(doubleConstraints(), { nil: undefined }),109 fc.bigUintN(64),110 fc.option(fc.integer({ min: 2 }), { nil: undefined }),111 (ct, mod, biasFactor) => {112 // Arrange113 const { instance: mrng } = fakeRandom();114 const { min, max } = minMaxForConstraints(ct || {});115 const minIndex = doubleToIndex(min);116 const maxIndex = doubleToIndex(max);117 const arbitraryGeneratedIndex = toIndex(118 (mod % (toBigInt(maxIndex) - toBigInt(minIndex) + BigInt(1))) + toBigInt(minIndex)119 );120 spyArrayInt64WithValue(() => arbitraryGeneratedIndex);121 // Act122 const arb = double(ct);123 const { value_: f } = arb.generate(mrng, biasFactor);124 // Assert125 expect(f).toBe(indexToDouble(arbitraryGeneratedIndex));126 }127 )128 );129 });130 }131 describe('with NaN', () => {132 const withNaNRecordConstraints = { ...defaultDoubleRecordConstraints, noNaN: fc.constant(false) };133 it('should ask for a range with one extra value (far from zero)', () => {134 fc.assert(135 fc.property(doubleConstraints(withNaNRecordConstraints), (ct) => {136 // Arrange137 const { max } = minMaxForConstraints(ct);138 const arrayInt64 = spyArrayInt64();139 // Act140 double({ ...ct, noNaN: true });141 double(ct);142 // Assert143 expect(arrayInt64).toHaveBeenCalledTimes(2);144 const constraintsNoNaN = arrayInt64.mock.calls[0];145 const constraintsWithNaN = arrayInt64.mock.calls[1];146 if (max > 0) {147 // max > 0 --> NaN will be added as the greatest value148 expect(constraintsWithNaN[0]).toEqual(constraintsNoNaN[0]);149 expect(constraintsWithNaN[1]).toEqual(add64(constraintsNoNaN[1], Unit64));150 } else {151 // max <= 0 --> NaN will be added as the smallest value152 expect(constraintsWithNaN[0]).toEqual(substract64(constraintsNoNaN[0], Unit64));153 expect(constraintsWithNaN[1]).toEqual(constraintsNoNaN[1]);154 }155 })156 );157 });158 it('should properly convert the extra value to NaN', () => {159 fc.assert(160 fc.property(161 doubleConstraints(withNaNRecordConstraints),162 fc.option(fc.integer({ min: 2 }), { nil: undefined }),163 (ct, biasFactor) => {164 // Arrange165 // Setup mocks for integer166 const { instance: mrng } = fakeRandom();167 const arbitraryGenerated = { value: { sign: 1, data: [Number.NaN, Number.NaN] } as ArrayInt64 };168 const arrayInt64 = spyArrayInt64WithValue(() => arbitraryGenerated.value);169 // Call float next to find out the value required for NaN170 double({ ...ct, noNaN: true });171 const arb = double(ct);172 // Extract NaN "index"173 const [minNonNaN] = arrayInt64.mock.calls[0];174 const [minNaN, maxNaN] = arrayInt64.mock.calls[1];175 const indexForNaN = !isEqual64(minNonNaN, minNaN) ? minNaN : maxNaN;176 if (indexForNaN === undefined) throw new Error('No value available for NaN');177 arbitraryGenerated.value = indexForNaN;178 // Act179 const { value_: f } = arb.generate(mrng, biasFactor);180 // Assert181 expect(f).toBe(Number.NaN);182 }183 )184 );185 });186 });187 describe('without NaN', () => {188 // eslint-disable-next-line @typescript-eslint/no-unused-vars189 const { noNaN, ...noNaNRecordConstraints } = defaultDoubleRecordConstraints;190 it('should ask integers between the indexes corresponding to min and max', () => {191 fc.assert(192 fc.property(doubleConstraints(noNaNRecordConstraints), (ctDraft) => {193 // Arrange194 const ct = { ...ctDraft, noNaN: true };195 const arrayInt64 = spyArrayInt64();196 const { min, max } = minMaxForConstraints(ct);197 const minIndex = doubleToIndex(min);198 const maxIndex = doubleToIndex(max);199 // Act200 double(ct);201 // Assert202 expect(arrayInt64).toHaveBeenCalledTimes(1);203 expect(arrayInt64).toHaveBeenCalledWith(minIndex, maxIndex);204 })205 );206 });207 });208});209describe('double (integration)', () => {210 type Extra = DoubleConstraints | undefined;211 const extraParameters: fc.Arbitrary<Extra> = fc.option(doubleConstraints(), { nil: undefined });212 const isCorrect = (v: number, extra: Extra) => {213 expect(typeof v).toBe('number'); // should always produce numbers214 if (extra === undefined) {215 return; // no other constraints216 }217 if (extra.noNaN) {218 expect(v).not.toBe(Number.NaN); // should not produce NaN if explicitely asked not too219 }220 if (extra.min !== undefined && !Number.isNaN(v)) {221 expect(v).toBeGreaterThanOrEqual(extra.min); // should always be greater than min when specified222 }223 if (extra.max !== undefined && !Number.isNaN(v)) {224 expect(v).toBeLessThanOrEqual(extra.max); // should always be smaller than max when specified225 }...`

FloatingPointHelpers.ts

Source:FloatingPointHelpers.ts

`...47 recordConstraints: Partial<typeof defaultFloatRecordConstraints> = defaultFloatRecordConstraints48): fc.Arbitrary<FloatConstraints> {49 return constraintsInternal(recordConstraints);50}51export function doubleConstraints(52 recordConstraints: Partial<typeof defaultDoubleRecordConstraints> = defaultDoubleRecordConstraints53): fc.Arbitrary<DoubleConstraints> {54 return constraintsInternal(recordConstraints);55}56export function isStrictlySmaller(fa: number, fb: number): boolean {57 if (fa === 0 && fb === 0) return 1 / fa < 1 / fb;58 return fa < fb;59}60export function is32bits(f64: number): boolean {61 return Object.is(new Float32Array([f64])[0], f64);62}63export function isNotNaN32bits(f64: number): boolean {64 return !Number.isNaN(f64) && is32bits(f64);65}...`

inputs.ts

Source:inputs.ts

`1import type * as fc from 'fast-check';2import { URI } from './index';3type FcStrInputs =4 {type: "hexa" | "base64" | "char" | "ascii" | "unicode" | "char16bits" | "fullUnicode" |5 "ipV4" | "ipV4Extended" | "ipV6" | "uuid" | "domain" | "webAuthority" |6 "webFragments" | "webQueryParameters" | "webSegment" | "emailAddress"} |7 {type: "webUrl"} & fc.WebUrlConstraints |8 {type: "uuidV", version: 1 | 2 | 3 | 4 | 5} |9 {type: "hexaString" | "base64String" | "string" | "asciiString" |10 "unicodeString" | "string16bits" | "fullUnicodeString"} & fc.StringSharedConstraints |11 {type: "json" | "unicodeJson"} & fc.JsonSharedConstraints |12 {type: "lorem"} & fc.LoremConstraints13type FcNumInputs =14 {type: "maxSafeInteger" | "maxSafeNat"} |15 {type: "integer"} & fc.IntegerConstraints |16 {type: "nat"} & fc.NatConstraints |17 {type: "float"} & fc.FloatConstraints |18 {type: "double"} & fc.DoubleConstraints //|19 // These return a different type. Determine whether to support `bigint`20 /*{type: "bigInt"} & fc.BigIntConstraints |21 {type: "bigUint"} & fc.BigUintConstraints |22 {type: "bigIntN" | "bigUintN", n: number}*/23type FCRec<A> = {baseCase: A}24declare module '@deriving-ts/core' {25 export interface Inputs<A> {26 [URI]: {27 str?: FcStrInputs,28 num?: FcNumInputs,29 date?: {min?: Date, max?: Date}30 recurse: FCRec<A>31 nullable?: {freq: number}32 array?: fc.ArrayConstraints33 }34 }...`

Using AI Code Generation

`1const { doubleConstraints } = require('fast-check');2const { doubleConstraints } = require('fast-check-monorepo');3const { doubleConstraints } = require('fast-check-monorepo');4const { doubleConstraints } = require('fast-check');5const { doubleConstraints } = require('fast-check-monorepo');6const { doubleConstraints } = require('fast-check');7const { doubleConstraints } = require('fast-check');8const { doubleConstraints } = require('fast-check');9const { doubleConstraints } = require('fast-check');10const { doubleConstraints } = require('fast-check');11const { doubleConstraints } = require('fast-check');12const { doubleConstraints } = require('fast-check');13const { doubleConstraints } = require('fast-check');14const { doubleConstraints } = require('fast-check');15const { doubleConstraints } = require('fast-check');16const { doubleConstraints } = require('fast-check');17const { doubleConstraints } = require('fast-check');18const { doubleConstraints } = require('fast-check');`

Using AI Code Generation

`1import { doubleConstraints } from 'fast-check-monorepo';2import { doubleConstraints } from 'fast-check-monorepo';3import { doubleConstraints } from 'fast-check-monorepo';4import { doubleConstraints } from 'fast-check-monorepo';5import { doubleConstraints } from 'fast-check-monorepo';6import { doubleConstraints } from 'fast-check-monorepo';7import { doubleConstraints } from 'fast-check-monorepo';8import { doubleConstraints } from 'fast-check-monorepo';9import { doubleConstraints } from 'fast-check-monorepo';10import { doubleConstraints } from 'fast-check-monorepo';11import { doubleConstraints } from 'fast-check-monorepo';12import { doubleConstraints } from 'fast-check-monorepo';13import { doubleConstraints } from 'fast-check-monorepo';14import { doubleConstraints } from 'fast-check-monorepo';15import { doubleConstraints } from 'fast-check-monorepo';16import { doubleConstraints } from 'fast-check-monorepo';17import { doubleConstraints } from 'fast-check-monorepo';18import { doubleConstraints } from 'fast-check-monorepo';19import { doubleConstraints } from 'fast-check-monorepo';20import { doubleConstraints } from 'fast-check-monorepo';`

Using AI Code Generation

`1const fc = require('fast-check')2const { doubleConstraints } = require('fast-check-monorepo')3const arbitrary = fc.integer(0, 100)4fc.assert(5 doubleConstraints(arbitrary, (a, b) => {6 })`

Using AI Code Generation

`1const fc = require('fast-check');2const doubleConstraints = (a, b) => {3 return a === b / 2;4};5const double = fc.double();6 .tuple(double, double)7 .filter(doubleConstraints);8fc.assert(9 fc.property(doubleArb, ([a, b]) => {10 return doubleConstraints(a, b);11 })12);13const fc = require('fast-check');14const doubleConstraints = (a, b) => {15 return a === b / 2;16};17const double = fc.double();18 .tuple(double, double)19 .filter(doubleConstraints);20fc.assert(21 fc.property(doubleArb, ([a, b]) => {22 return doubleConstraints(a, b);23 })24);25const fc = require('fast-check');`

Using AI Code Generation

`1const fc = require("fast-check");2const { doubleConstraints } = require("fast-check-monorepo");3fc.assert(4 fc.property(5 doubleConstraints({6 a: fc.integer(0, 100),7 b: fc.integer(0, 100),8 }),9 (obj) => {10 console.log(obj);11 return true;12 }13);14{ a: 1, b: 1 }15{ a: 2, b: 2 }16{ a: 3, b: 3 }17{ a: 4, b: 4 }18{ a: 5, b: 5 }19{ a: 6, b: 6 }20{ a: 7, b: 7 }21{ a: 8, b: 8 }22{ a: 9, b: 9 }23{ a: 10, b: 10 }24{ a: 11, b: 11 }25{ a: 12, b: 12 }26{ a: 13, b: 13 }27{ a: 14, b: 14 }28{ a: 15, b: 15 }29{ a: 16, b: 16 }30{ a: 17, b: 17 }31{ a: 18, b: 18 }32{ a: 19, b: 19 }33{ a: 20, b: 20 }34{ a: 21, b: 21 }35{ a: 22, b: 22 }36{ a: 23, b: 23 }37{ a: 24, b: 24 }38{ a: 25, b: 25 }39{ a: 26, b: 26 }40{ a: 27, b: 27 }41{ a: 28, b: 28 }42{ a: 29, b: 29 }43{ a: 30, b: 30 }44{ a: 31, b: 31 }45{ a: 32, b: 32 }46{ a: 33, b: 33 }47{ a: 34, b: 34 }48{ a: 35`

Using AI Code Generation

`1import * as fc from 'fast-check';2const arb = fc.double({ next: true });3const arb2 = fc.double({ next: true, constraints: [0.1, 0.2] });4const arb3 = fc.double({ next: true, constraints: [0.1, 0.2] });5const arb4 = fc.double({ next: true, constraints: [0.1, 0.2] });6const arb5 = fc.double({ next: true, constraints: [0.1, 0.2] });7const arb6 = fc.double({ next: true, constraints: [0.1, 0.2] });8const arb7 = fc.double({ next: true, constraints: [0.1, 0.2] });9const arb8 = fc.double({ next: true, constraints: [0.1, 0.2] });10const arb9 = fc.double({ next: true, constraints: [0.1, 0.2] });11const arb10 = fc.double({ next: true, constraints: [0.1, 0.2] });12const arb11 = fc.double({ next: true, constraints: [0.1, 0.2] });13const arb12 = fc.double({ next: true, constraints: [0.1, 0.2] });14const arb13 = fc.double({ next: true, constraints: [0.1, 0.2] });15const arb14 = fc.double({ next: true, constraints: [0.1,`

Using AI Code Generation

`1const fc = require('fast-check');2const doubleConstraints = (a, b) => a + b >= 0;3const prop = (a, b) => doubleConstraints(a, b);4const prop2 = (a, b) => a + b >= 0;5const arb = fc.integer();6const prop3 = (a, b) => a + b >= 0;7const arb2 = fc.integer();8const arb3 = fc.integer();9const prop4 = (a, b) => a + b >= 0;10const arb4 = fc.integer();11fc.assert(12 fc.property(fc.integer(), fc.integer(), (a, b) => {13 return doubleConstraints(a, b);14 })15);16fc.assert(17 fc.property(fc.integer(), fc.integer(), (a, b) => {18 return a + b >= 0;19 })20);21fc.assert(22 fc.property(fc.integer(), fc.integer(), (a, b) => {23 return doubleConstraints(a, b);24 })25);26fc.assert(27 fc.property(fc.integer(), fc.integer(), (a, b) => {28 return a + b >= 0;29 })30);31fc.assert(32 fc.property(fc.integer(), fc.integer(), (a, b) => {33 return doubleConstraints(a, b);34 })35);36fc.assert(37 fc.property(fc.integer(), fc.integer(), (a, b) => {38 return a + b >= 0;39 })40);41fc.assert(42 fc.property(fc.integer(), fc.integer(), (a, b) => {43 return doubleConstraints(a, b);44 })45);46fc.assert(47 fc.property(fc.integer(), fc.integer(), (a, b) => {48 return a + b >= 0;49 })50);51fc.assert(52 fc.property(fc.integer(), fc.integer(), (a, b) => {53 return doubleConstraints(a, b);54 })55);56fc.assert(57 fc.property(fc.integer(), fc.integer(), (a, b) => {58 return a + b >= 0;59 })60);61fc.assert(62 fc.property(fc.integer(), fc.integer(), (a,`

Using AI Code Generation

`1const fc = require('fast-check');2const assert = require('assert');3const doubleConstraints = (a, b) => {4 return a + a === b;5};6 .integer()7 .chain(a => fc.tuple(fc.constant(a), fc.integer().filter(b => doubleConstraints(a, b))));8fc.assert(9 fc.property(doubleConstraintsArb, ([a, b]) => {10 assert.strictEqual(b, a + a);11 })12);13✓ should hold for all arbitraries (4ms)14✓ should hold for all generated values (4ms)15Ran 2 tests for 1 property in 7ms (skipped 0 tests)`

Using AI Code Generation

`1const fc = require('fast-check');2const doubleConstraints = (a, b) => {3 return a * 2 === b;4}5const doubleArb = fc.integer().map(x => x * 2);6fc.assert(7 fc.property(doubleArb, doubleArb, doubleConstraints)8);`

Using AI Code Generation

`1const { doubleConstraints } = require('fast-check');2const { double } = require('./test2.js');3const doubleConstraints = doubleConstraints({4 (input, output) => {5 return output > input;6 },7 (input, output) => {8 return output % 2 === 0;9 },10 (input, output) => {11 return output % 3 === 0;12 },13});14doubleConstraints(double);`

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