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How to use attemptExact method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

SlicedBasedGenerator.spec.ts

Source:SlicedBasedGenerator.spec.ts

...22            const targetLength = slices[targetLengthMod % slices.length].length;23            // Act24            const generator = new SlicedBasedGenerator(arb, mrng, slices, biasFactor);25            const readFromGenerator: unknown[] = [];26            generator.attemptExact(targetLength);27            for (let index = 0; index !== targetLength; ++index) {28              readFromGenerator.push(generator.next().value);29            }30            // Assert31            expect(nextInt).toHaveBeenCalledTimes(2); // only called twice: 1/ to bias to one of the slices 2/ to select which one32            expect(nextInt).toHaveBeenCalledWith(1, biasFactor);33            expect(slices).toContainEqual(readFromGenerator);34          }35        )36      );37    });38  });39  describe('next', () => {40    it('should only go for values coming from the source arbitrary when tossing for unbias', () => {41      fc.assert(42        fc.property(43          fc.array(fc.array(fc.anything(), { minLength: 1 }), { minLength: 1 }),44          fc.infiniteStream(fc.anything()),45          fc.nat({ max: 10 }),46          fc.integer({ min: 2 }),47          (slices, streamValues, targetLength, biasFactor) => {48            // Arrange49            const producedValues: unknown[] = [];50            const { instance: arb, generate } = fakeArbitrary();51            generate.mockImplementation(() => {52              const value = streamValues.next().value;53              const context = streamValues.next().value;54              producedValues.push(value);55              return new Value(value, context);56            });57            const { instance: mrng, nextInt } = fakeRandom();58            nextInt.mockImplementation((_min, max) => max); // >min ie in [min+1,max] corresponds to unbiased59            // Act60            const generator = new SlicedBasedGenerator(arb, mrng, slices, biasFactor);61            const readFromGenerator: unknown[] = [];62            generator.attemptExact(targetLength);63            for (let index = 0; index !== targetLength; ++index) {64              readFromGenerator.push(generator.next().value);65            }66            // Assert67            expect(generate).toHaveBeenCalledTimes(targetLength);68            expect(readFromGenerator).toEqual(producedValues);69          }70        )71      );72    });73    it('should only go for values coming from the slices when tossing for bias', () => {74      fc.assert(75        fc.property(76          fc.array(fc.array(fc.anything(), { minLength: 1 }), { minLength: 1 }),77          fc.infiniteStream(fc.nat()),78          fc.nat({ max: 10 }),79          fc.integer({ min: 2 }),80          fc.boolean(),81          (slices, streamModValues, targetLength, biasFactor, withAttemptExact) => {82            // Arrange83            const { instance: arb, generate } = fakeArbitrary();84            const { instance: mrng, nextInt } = fakeRandom();85            const allValuesFromSlices = slices.flat();86            // Act87            const generator = new SlicedBasedGenerator(arb, mrng, slices, biasFactor);88            const readFromGenerator: unknown[] = [];89            if (withAttemptExact) {90              nextInt.mockImplementation((_min, max) => max); // no bias for attemptExact91              generator.attemptExact(targetLength);92            }93            for (let index = 0; index !== targetLength; ++index) {94              let returnedBias = false;95              nextInt.mockImplementation((min, max) => {96                if (!returnedBias) {97                  returnedBias = true;98                  return min; // ask for bias, to make sure we use slices99                }100                return (streamModValues.next().value % (max - min + 1)) + min; // pure random for next calls101              });102              const value = generator.next().value;103              expect(allValuesFromSlices).toContain(value); // should only produce values coming from slices104              readFromGenerator.push(value);105            }...

NoopSlicedGenerator.ts

Source:NoopSlicedGenerator.ts

...8    private readonly arb: Arbitrary<T>,9    private readonly mrng: Random,10    private readonly biasFactor: number | undefined11  ) {}12  attemptExact(): void {13    return;14  }15  next(): Value<T> {16    return this.arb.generate(this.mrng, this.biasFactor);17  }...

SlicedGenerator.ts

Source:SlicedGenerator.ts

1import { Value } from '../../../check/arbitrary/definition/Value';2/**3 * Internal helper responsible to fallback from time to time to already pre-computed entries4 * provided by the caller and referred as slices5 * @internal6 */7export type SlicedGenerator<T> = {8  /**9   * Warm-up the generator with an idea of the exact size.10   * It may be used by the generator to favor some values (the ones with the right length) instead of others.11   * @internal12   */13  attemptExact: (targetLength: number) => void;14  /**15   * Compute the next generated value16   * @internal17   */18  next: () => Value<T>;...

Using AI Code Generation

1const fc = require('fast-check');2const { attemptExact } = require('fast-check/lib/check/arbitrary/definition/AttemptArbitrary.js');3const { integer } = require('fast-check/lib/check/arbitrary/IntegerArbitrary.js');4const { tuple } = require('fast-check/lib/check/arbitrary/TupleArbitrary.js');5const { oneof } = require('fast-check/lib/check/arbitrary/OneOfArbitrary.js');6const { constantFrom } = require('fast-check/lib/check/arbitrary/ConstantArbitrary.js');7const { record } = require('fast-check/lib/check/arbitrary/RecordArbitrary.js');8const { stringOf } = require('fast-check/lib/check/arbitrary/StringArbitrary.js');9const { array } = require('fast-check/lib/check/arbitrary/ArrayArbitrary.js');10const { option } = require('fast-check/lib/check/arbitrary/OptionArbitrary.js');11const { set } = require('fast-check/lib/check/arbitrary/SetArbitrary.js');12const { map } = require('fast-check/lib/check/arbitrary/MapArbitrary.js');13const { dictionary } = require('fast-check/lib/check/arbitrary/DictionaryArbitrary.js');14const { date } = require('fast-check/lib/check/arbitrary/DateArbitrary.js');15const { bigUintN } = require('fast-check/lib/check/arbitrary/BigIntArbitrary.js');16const { float } = require('fast-check/lib/check/arbitrary/FloatArbitrary.js');17const { double } = require('fast-check/lib/check/arbitrary/DoubleArbitrary.js');18const { char } = require('fast-check/lib/check/arbitrary/CharacterArbitrary.js');19const { unicode } = require('fast-check/lib/check/arbitrary/UnicodeArbitrary.js');20const { unicodeJsonString } = require('fast-check/lib/check/arbitrary/UnicodeJsonStringArbitrary.js');21const { ascii } = require('fast-check/lib/check/arbitrary/AsciiArbitrary.js');22const { asciiString } = require('fast-check/lib/check/arbitrary/AsciiStringArbitrary.js');23const { fullUnicode } = require('fast-check/lib/check/arbitrary/FullUnicodeArbitrary.js');24const { fullUnicodeString } = require('fast-check/lib/check/arbitrary/FullUnicodeStringArbitrary.js');25const { hexa } = require('fast-check/lib/check/arbitrary/HexaArbitrary.js');26const { hexaString } = require('fast-check/lib/check

Using AI Code Generation

1import * as fc from 'fast-check'2fc.assert(3  fc.property(fc.integer(), fc.integer(), (a, b) => {4  }),5  { numRuns: 1000 }6import * as fc from 'fast-check'7fc.assert(8  fc.property(fc.integer(), fc.integer(), (a, b) => {

Using AI Code Generation

1const fc = require("fast-check");2const { attemptExact } = require("fast-check/lib/check/arbitrary/definition/ArbitraryWithShrink");3const arb = fc.integer(1, 100);4const predicate = (num) => num % 2 === 0;5fc.assert(6  fc.property(arb, (num) => {7    const result = attemptExact(predicate, num);8    if (predicate(num)) {9      return result.success;10    } else {11      return !result.success;12    }13  })14);15const fc = require("fast-check");16const { attemptExact } = require("fast-check/lib/check/arbitrary/definition/ArbitraryWithShrink");17const arb = fc.integer(1, 100);18const predicate = (num) => num % 2 === 0;19fc.assert(20  fc.property(arb, (num) => {21    const result = attemptExact(predicate, num);22    if (predicate(num)) {23      return result.success;24    } else {25      return !result.success;26    }27  })28);29[1/1] ✖ Shrunk 0 time(s)30    at Array.reduce (<anonymous>)31    at Runner._runProperty (/Users/jameslamb/Documents/fast-check-monorepo/node_modules/fast-check/lib/check/runner/Runner.js:89:26)32    at Runner._runPropertyWithHooks (/Users/jameslamb/Documents/fast-check-monore

Using AI Code Generation

1import { attemptExact } from 'fast-check';2const run = () => {3  const result = attemptExact(() => {4    throw new Error('error');5  });6  console.log(result);7};8run();9import { attemptExact } from 'fast-check';10const run = () => {11  const result = attemptExact(() => {12    throw new Error('error');13  });14  console.log(result);15};16run();17import { attemptExact } from 'fast-check';18const run = () => {19  const result = attemptExact(() => {20    throw new Error('error');21  });22  console.log(result);23};24run();25import { attemptExact } from 'fast-check';26const run = () => {27  const result = attemptExact(() => {28    throw new Error('error');29  });30  console.log(result);31};32run();33import { attemptExact } from 'fast-check';34const run = () => {35  const result = attemptExact(() => {36    throw new Error('error');37  });38  console.log(result);39};40run();41import { attemptExact } from 'fast-check';42const run = () => {43  const result = attemptExact(() => {44    throw new Error('error');45  });46  console.log(result);47};48run();49import { attemptExact } from 'fast-check';50const run = () => {51  const result = attemptExact(() => {52    throw new Error('error');53  });54  console.log(result);55};56run();57import { attemptExact } from 'fast-check';58const run = () => {59  const result = attemptExact(() => {60    throw new Error('error');61  });62  console.log(result);63};64run();

Using AI Code Generation

1const { attemptExact } = require('fast-check');2const isEven = (n) => n % 2 === 0;3const isOdd = (n) => n % 2 === 1;4const evenNumber = attemptExact(isEven, 1000);5const oddNumber = attemptExact(isOdd, 1000);6console.log(evenNumber);7console.log(oddNumber);8const { attemptExact } = require('fast-check');9const isEven = (n) => n % 2 === 0;10const isOdd = (n) => n % 2 === 1;11const evenNumber = attemptExact(isEven, 1000, 10000);12const oddNumber = attemptExact(isOdd, 1000, 10000);13console.log(evenNumber);14console.log(oddNumber);15at attemptExact (C:\Users\user\Documents\GitHub\fast-check-monorepo\src\check\runner\Runner.ts:51:11)16at Object.<anonymous> (C:\Users\user\Documents\GitHub\fast-check-monorepo\test3.js:9:21)17at Module._compile (internal/modules/cjs/loader.js:1138:30)18at Object.Module._extensions..js (internal/modules/cjs/loader.js:1158:10)19at Module.load (internal/modules/cjs/loader.js:985:32)20at Function.Module._load (internal/modules/cjs/loader.js:878:14)21at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)22at attemptExact (C:\Users\user\Documents\GitHub\fast-check-monorepo\src\check\runner\Runner.ts:51:11)23at Object.<anonymous> (C:\Users\user\Documents\GitHub\fast-check-monorepo\test3.js:9:21)24at Module._compile (internal/modules/cjs/loader.js:1138:30)25at Object.Module._extensions..js (

Using AI Code Generation

1const fc = require("fast-check");2const { integer } = require("fast-check");3const test3 = () => {4  const a = integer({ min: 1, max: 10 }).attemptExact(1);5  console.log(a);6};7test3();8const fc = require("fast-check");9const { integer } = require("fast-check");10const test4 = () => {11  const a = integer({ min: 1, max: 10 }).attemptExact(11);12  console.log(a);13};14test4();15const fc = require("fast-check");16const { integer } = require("fast-check");17const test5 = () => {18  const a = integer({ min: 1, max: 10 }).attemptExact(0);19  console.log(a);20};21test5();22const fc = require("fast-check");23const { integer } = require("fast-check");24const test6 = () => {25  const a = integer({ min: 1, max: 10 }).attemptExact(10);26  console.log(a);27};28test6();29const fc = require("fast-check");30const { integer } = require("fast-check");31const test7 = () => {32  const a = integer({ min: 1, max: 10 }).attemptExact(0.5);33  console.log(a);34};35test7();36const fc = require("fast-check");37const { integer } = require("fast-check");38const test8 = () => {39  const a = integer({ min: 1, max: 10 }).attemptExact(10.5);40  console.log(a);

Using AI Code Generation

1import { attemptExact } from 'fast-check'2const run = (n: number, seed: number) => {3  const result = attemptExact(n, () => seed)4  console.log(result)5}6run(100, 1)7run(100, 2)8run(100, 3)9import { attempt } from 'fast-check'10const run = (n: number, seed: number) => {11  const result = attempt(n, () => seed)12  console.log(result)13}14run(100, 1)15run(100, 2)16run(100, 3)17import { sample } from 'fast-check'18const run = (n: number, seed: number) => {19  const result = sample(n, () => seed)20  console.log(result)21}22run(100, 1)23run(100, 2)24run(100, 3)25import { sample } from 'fast-check'26const run = (n: number, seed: number) => {27  const result = sample(n, () => seed)28  console.log(result)29}30run(100, 1)31run(100, 2)32run(100, 3)33import { sample } from 'fast-check'34const run = (n: number, seed: number) => {35  const result = sample(n, () => seed)36  console.log(result)37}38run(100, 1)39run(100, 2)40run(100, 3)41import { sample } from 'fast-check'42const run = (n: number, seed: number) => {

Using AI Code Generation

1const fc = require('fast-check');2const str = 'abcdefghij';3const isValid = (x) => {4  return x.length === 10;5};6const test = () => {7    .attemptExact(str, isValid, 100)8    .then((res) => {9      console.log(res);10    })11    .catch((err) => {12      console.log(err);13    });14};15test();

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