How to use sampledSelectedValues method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

uniqueArray.spec.ts

Source:uniqueArray.spec.ts

1import * as fc from 'fast-check';2import { uniqueArray, UniqueArrayConstraints } from '../../../src/arbitrary/uniqueArray';3import { FakeIntegerArbitrary, fakeArbitrary } from './__test-helpers__/ArbitraryHelpers';4import * as ArrayArbitraryMock from '../../../src/arbitrary/_internals/ArrayArbitrary';5import {6  assertProduceCorrectValues,7  assertProduceSameValueGivenSameSeed,8  assertProduceValuesShrinkableWithoutContext,9  assertShrinkProducesSameValueWithoutInitialContext,10} from './__test-helpers__/ArbitraryAssertions';11import { Value } from '../../../src/check/arbitrary/definition/Value';12import { buildShrinkTree, renderTree } from './__test-helpers__/ShrinkTree';13import { sizeRelatedGlobalConfigArb } from './__test-helpers__/SizeHelpers';14import { withConfiguredGlobal } from './__test-helpers__/GlobalSettingsHelpers';15function beforeEachHook() {16  jest.resetModules();17  jest.restoreAllMocks();18  fc.configureGlobal({ beforeEach: beforeEachHook });19}20beforeEach(beforeEachHook);21describe('uniqueArray', () => {22  it('should instantiate ArrayArbitrary(arb, 0, ?, 0x7fffffff, n.a, <default>) for uniqueArray(arb)', () => {23    fc.assert(24      fc.property(sizeRelatedGlobalConfigArb, (config) => {25        // Arrange26        const { instance: childInstance } = fakeArbitrary<unknown>();27        const { instance } = fakeArbitrary<unknown[]>();28        const ArrayArbitrary = jest.spyOn(ArrayArbitraryMock, 'ArrayArbitrary');29        ArrayArbitrary.mockImplementation(() => instance as ArrayArbitraryMock.ArrayArbitrary<unknown>);30        // Act31        const arb = withConfiguredGlobal(config, () => uniqueArray(childInstance));32        // Assert33        expect(ArrayArbitrary).toHaveBeenCalledWith(34          childInstance,35          0,36          expect.any(Number),37          0x7fffffff,38          undefined,39          expect.any(Function),40          []41        );42        const receivedGeneratedMaxLength = ArrayArbitrary.mock.calls[0][2]; // Expecting the real value would check an implementation detail43        expect(receivedGeneratedMaxLength).toBeGreaterThan(0);44        expect(receivedGeneratedMaxLength).toBeLessThanOrEqual(2 ** 31 - 1);45        expect(Number.isInteger(receivedGeneratedMaxLength)).toBe(true);46        expect(arb).toBe(instance);47      })48    );49  });50  it('should instantiate ArrayArbitrary(arb, 0, ?, maxLength, n.a, <default>) for uniqueArray(set, {maxLength})', () => {51    fc.assert(52      fc.property(sizeRelatedGlobalConfigArb, fc.nat({ max: 2 ** 31 - 1 }), (config, maxLength) => {53        // Arrange54        const { instance: childInstance } = fakeArbitrary<unknown>();55        const { instance } = fakeArbitrary<unknown[]>();56        const ArrayArbitrary = jest.spyOn(ArrayArbitraryMock, 'ArrayArbitrary');57        ArrayArbitrary.mockImplementation(() => instance as ArrayArbitraryMock.ArrayArbitrary<unknown>);58        // Act59        const arb = withConfiguredGlobal(config, () => uniqueArray(childInstance, { maxLength }));60        // Assert61        expect(ArrayArbitrary).toHaveBeenCalledWith(62          childInstance,63          0,64          expect.any(Number),65          maxLength,66          undefined,67          expect.any(Function),68          []69        );70        const receivedGeneratedMaxLength = ArrayArbitrary.mock.calls[0][2]; // Expecting the real value would check an implementation detail71        expect(receivedGeneratedMaxLength).toBeGreaterThanOrEqual(0);72        expect(receivedGeneratedMaxLength).toBeLessThanOrEqual(maxLength);73        expect(Number.isInteger(receivedGeneratedMaxLength)).toBe(true);74        if (config.defaultSizeToMaxWhenMaxSpecified) {75          expect(ArrayArbitrary).toHaveBeenCalledWith(76            childInstance,77            0,78            maxLength,79            maxLength,80            undefined,81            expect.any(Function),82            []83          );84        }85        expect(arb).toBe(instance);86      })87    );88  });89  it('should instantiate ArrayArbitrary(arb, minLength, ?, 0x7fffffff, n.a, <default>) for uniqueArray(arb, {minLength})', () => {90    fc.assert(91      fc.property(sizeRelatedGlobalConfigArb, fc.nat({ max: 2 ** 31 - 1 }), (config, minLength) => {92        // Arrange93        const { instance: childInstance } = fakeArbitrary<unknown>();94        const { instance, filter } = fakeArbitrary<unknown[]>();95        const ArrayArbitrary = jest.spyOn(ArrayArbitraryMock, 'ArrayArbitrary');96        ArrayArbitrary.mockImplementation(() => instance as ArrayArbitraryMock.ArrayArbitrary<unknown>);97        filter.mockReturnValue(instance);98        // Act99        const arb = withConfiguredGlobal(config, () => uniqueArray(childInstance, { minLength }));100        // Assert101        expect(ArrayArbitrary).toHaveBeenCalledWith(102          childInstance,103          minLength,104          expect.any(Number),105          0x7fffffff,106          undefined,107          expect.any(Function),108          []109        );110        const receivedGeneratedMaxLength = ArrayArbitrary.mock.calls[0][2]; // Expecting the real value would check an implementation detail111        if (minLength !== 2 ** 31 - 1) {112          expect(receivedGeneratedMaxLength).toBeGreaterThan(minLength);113          expect(receivedGeneratedMaxLength).toBeLessThanOrEqual(2 ** 31 - 1);114          expect(Number.isInteger(receivedGeneratedMaxLength)).toBe(true);115        } else {116          expect(receivedGeneratedMaxLength).toEqual(minLength);117        }118        expect(arb).toBe(instance);119      })120    );121  });122  it('should instantiate ArrayArbitrary(arb, minLength, ?, maxLength, n.a, <default>) for uniqueArray(arb, {minLength,maxLength})', () => {123    fc.assert(124      fc.property(125        sizeRelatedGlobalConfigArb,126        fc.nat({ max: 2 ** 31 - 1 }),127        fc.nat({ max: 2 ** 31 - 1 }),128        (config, aLength, bLength) => {129          // Arrange130          const [minLength, maxLength] = aLength < bLength ? [aLength, bLength] : [bLength, aLength];131          const { instance: childInstance } = fakeArbitrary<unknown>();132          const { instance, filter } = fakeArbitrary<unknown[]>();133          const ArrayArbitrary = jest.spyOn(ArrayArbitraryMock, 'ArrayArbitrary');134          ArrayArbitrary.mockImplementation(() => instance as ArrayArbitraryMock.ArrayArbitrary<unknown>);135          filter.mockReturnValue(instance);136          // Act137          const arb = withConfiguredGlobal(config, () => uniqueArray(childInstance, { minLength, maxLength }));138          // Assert139          expect(ArrayArbitrary).toHaveBeenCalledWith(140            childInstance,141            minLength,142            expect.any(Number),143            maxLength,144            undefined,145            expect.any(Function),146            []147          );148          const receivedGeneratedMaxLength = ArrayArbitrary.mock.calls[0][2]; // Expecting the real value would check an implementation detail149          expect(receivedGeneratedMaxLength).toBeGreaterThanOrEqual(minLength);150          expect(receivedGeneratedMaxLength).toBeLessThanOrEqual(maxLength);151          expect(Number.isInteger(receivedGeneratedMaxLength)).toBe(true);152          if (config.defaultSizeToMaxWhenMaxSpecified) {153            expect(ArrayArbitrary).toHaveBeenCalledWith(154              childInstance,155              minLength,156              maxLength,157              maxLength,158              undefined,159              expect.any(Function),160              []161            );162          }163          expect(arb).toBe(instance);164        }165      )166    );167  });168  it('should accept custom comparator or selector or both at the same time or none', () => {169    fc.assert(170      fc.property(171        sizeRelatedGlobalConfigArb,172        fc173          .record(174            {175              minLength: fc.nat({ max: 2 ** 31 - 1 }),176              maxLength: fc.nat({ max: 2 ** 31 - 1 }),177              comparator: comparatorArbitrary(),178              selector: selectorArbitrary(),179              depthIdentifier: fc.string(),180            },181            { requiredKeys: [] }182          )183          .map((constraints) =>184            constraints.minLength !== undefined &&185            constraints.maxLength !== undefined &&186            constraints.minLength > constraints.maxLength187              ? ({188                  ...constraints,189                  minLength: constraints.maxLength,190                  maxLength: constraints.minLength,191                } as UniqueArrayConstraints<unknown, unknown>)192              : ({ ...constraints } as UniqueArrayConstraints<unknown, unknown>)193          ),194        (config, constraints) => {195          // Arrange196          const { instance: childInstance } = fakeArbitrary<unknown>();197          const { instance, filter } = fakeArbitrary<unknown[]>();198          const ArrayArbitrary = jest.spyOn(ArrayArbitraryMock, 'ArrayArbitrary');199          ArrayArbitrary.mockImplementation(() => instance as ArrayArbitraryMock.ArrayArbitrary<unknown>);200          filter.mockReturnValue(instance);201          // Act202          const arb = withConfiguredGlobal(config, () => uniqueArray(childInstance, constraints));203          // Assert204          expect(ArrayArbitrary).toHaveBeenCalledWith(205            childInstance,206            constraints.minLength !== undefined ? constraints.minLength : expect.any(Number),207            expect.any(Number),208            constraints.maxLength !== undefined ? constraints.maxLength : expect.any(Number),209            constraints.depthIdentifier,210            expect.any(Function),211            []212          );213          expect(arb).toBe(instance);214        }215      )216    );217  });218  it('should throw when minimum length is greater than maximum one', () => {219    fc.assert(220      fc.property(221        sizeRelatedGlobalConfigArb,222        fc.nat({ max: 2 ** 31 - 1 }),223        fc.nat({ max: 2 ** 31 - 1 }),224        fc.option(comparatorArbitrary(), { nil: undefined }),225        fc.option(selectorArbitrary(), { nil: undefined }),226        (config, aLength, bLength, comparator, selector) => {227          // Arrange228          fc.pre(aLength !== bLength);229          const [minLength, maxLength] = aLength < bLength ? [bLength, aLength] : [aLength, bLength];230          const { instance: childInstance } = fakeArbitrary<unknown>();231          // Act / Assert232          expect(() =>233            withConfiguredGlobal(config, () =>234              uniqueArray(childInstance, { minLength, maxLength, comparator, selector })235            )236          ).toThrowError();237        }238      )239    );240  });241});242describe('uniqueArray (integration)', () => {243  type Extra = UniqueArrayConstraints<unknown, unknown>;244  const extraParameters: fc.Arbitrary<Extra> = fc245    .tuple(246      fc.nat({ max: 5 }),247      fc.nat({ max: 30 }),248      fc.boolean(),249      fc.boolean(),250      fc.option(fc.func(fc.integer()), { nil: undefined }),251      fc.option(comparatorArbitrary(), { nil: undefined })252    )253    .map(([min, gap, withMin, withMax, selector, comparator]) => {254      // We only apply selector/comparator in case the minimal number of items requested can be reached with the selector/comparator.255      // eg.: selector = v => 0, means that we will have at most 1 value in the array, never more, so it cannot be used with min > 1256      const requestedMin = withMin ? min : 0;257      let selectorEnabled = requestedMin === 0 || selector === undefined;258      let comparatorEnabled = requestedMin === 0 || comparator === undefined;259      const sampleSize = 50;260      const sampledSelectedValues = new Set<unknown>();261      const sampledSelectedAndComparedValues: unknown[] = [];262      const resolvedSelector = resolveSelectorFunction(selector);263      const resolvedComparator = resolveComparatorFunction(comparator);264      for (let v = 0; v !== sampleSize && (!selectorEnabled || !comparatorEnabled); ++v) {265        const selected = resolvedSelector(v); // either v (integer in 0..sampleSize) or an integer (by construct of selector)266        sampledSelectedValues.add(selected);267        selectorEnabled = selectorEnabled || sampledSelectedValues.size >= requestedMin;268        if (!comparatorEnabled && comparator !== undefined) {269          if (sampledSelectedAndComparedValues.every((p) => !resolvedComparator(p, selected))) {270            // Selected is "different" from all the other known values271            sampledSelectedAndComparedValues.push(selected);272            comparatorEnabled = comparatorEnabled || sampledSelectedAndComparedValues.length >= requestedMin;273            selectorEnabled = selectorEnabled || comparatorEnabled; // comparator enabled unlocks selector too274          }275        }276      }277      return {278        minLength: withMin ? min : undefined,279        maxLength: withMax ? min + gap : undefined,280        selector: selectorEnabled ? selector : undefined,281        comparator: comparatorEnabled ? comparator : undefined,282      };283    });284  const isCorrect = (value: number[], extra: Extra) => {285    if (extra.minLength !== undefined) {286      expect(value.length).toBeGreaterThanOrEqual(extra.minLength);287    }288    if (extra.maxLength !== undefined) {289      expect(value.length).toBeLessThanOrEqual(extra.maxLength);290    }291    for (const v of value) {292      expect(typeof v).toBe('number');293    }294    const resolvedSelector = resolveSelectorFunction(extra.selector);295    const resolvedComparator = resolveComparatorFunction(extra.comparator);296    const alreadySeen: unknown[] = [];297    for (const v of value) {298      const selected = resolvedSelector(v);299      const matchingEntry = alreadySeen.some((e) => resolvedComparator(e, selected));300      expect(matchingEntry).toBe(false);301      alreadySeen.push(selected);302    }303  };304  const integerUpTo10000AndNaNOrMinusZero = new FakeIntegerArbitrary(-2, 10000).map(305    (v) => (v === -2 ? Number.NaN : v === -1 ? -0 : v),306    (v) => {307      if (typeof v !== 'number' || v === -1 || v === -2) throw new Error('');308      return Object.is(v, Number.NaN) ? -2 : Object.is(v, -0) ? -1 : v;309    }310  );311  const uniqueArrayBuilder = (extra: Extra) => uniqueArray(integerUpTo10000AndNaNOrMinusZero, extra);312  it('should produce the same values given the same seed', () => {313    assertProduceSameValueGivenSameSeed(uniqueArrayBuilder, { extraParameters });314  });315  it('should only produce correct values', () => {316    assertProduceCorrectValues(uniqueArrayBuilder, isCorrect, { extraParameters });317  });318  it('should produce values seen as shrinkable without any context', () => {319    assertProduceValuesShrinkableWithoutContext(uniqueArrayBuilder, { extraParameters });320  });321  it('should be able to shrink to the same values without initial context', () => {322    assertShrinkProducesSameValueWithoutInitialContext(uniqueArrayBuilder, { extraParameters });323  });324  // Property: should preserve strictly smaller ordering in shrink325  // Is not applicable in the case of `set` as some values may not be in the "before" version326  // of the array while they can suddenly appear on shrink. They might have been hidden because327  // another value inside the array shadowed them. While on shrink those entries shadowing others328  // may have disappear.329  it.each`330    source                                       | constraints331    ${[2, 4, 8] /* not large enough */}          | ${{ minLength: 4 }}332    ${[2, 4, 8] /* too large */}                 | ${{ maxLength: 2 }}333    ${[2, 4, 8] /* not unique for selector */}   | ${{ selector: (item: number) => Math.floor(item / 5) }}334    ${[2, 4, 8] /* not unique for comparator */} | ${{ comparator: (a: number, b: number) => Math.abs(a - b) <= 2 }}335  `('should not be able to generate $source with fc.uniqueArray(arb, $constraints)', ({ source, constraints }) => {336    // Arrange / Act337    const arb = uniqueArray(new FakeIntegerArbitrary(0, 1000), constraints);338    const out = arb.canShrinkWithoutContext(source);339    // Assert340    expect(out).toBe(false);341  });342  it.each`343    rawValue                 | constraints344    ${[2, 4, 8, 16, 32, 64]} | ${{}}345    ${[2, 4, 8]}             | ${{}}346    ${[2, 4, 8]}             | ${{ minLength: 2 }}347    ${[2, 4, 8]}             | ${{ minLength: 3 }}348    ${[2, 8]}                | ${{ selector: (item: number) => Math.floor(item / 5) }}349    ${[2, 8]}                | ${{ comparator: (a: number, b: number) => Math.abs(a - b) <= 2 }}350  `('should be able to shrink $rawValue with fc.uniqueArray(arb, $constraints)', ({ rawValue, constraints }) => {351    // Arrange352    const arb = uniqueArray(new FakeIntegerArbitrary(0, 1000), constraints);353    const value = new Value(rawValue, undefined);354    // Act355    const renderedTree = renderTree(buildShrinkTree(arb, value, { numItems: 100 })).join('\n');356    // Assert357    expect(arb.canShrinkWithoutContext(rawValue)).toBe(true);358    expect(renderedTree).toMatchSnapshot();359  });360});361// Helpers362type ComparatorType<T = unknown, U = unknown> = UniqueArrayConstraints<T, U>['comparator'];363function comparatorArbitrary(): fc.Arbitrary<ComparatorType> {364  return fc.oneof(365    fc.constantFrom<ComparatorType>('IsStrictlyEqual', 'SameValue', 'SameValueZero'),366    fc.compareFunc().map((f) => (a: unknown, b: unknown) => f(a, b) === 0)367  );368}369function resolveComparatorFunction<T, U>(370  comparator: ComparatorType<T, U> | undefined371): (a: unknown, b: unknown) => boolean {372  if (comparator === undefined) {373    return (a, b) => Object.is(a, b);374  }375  if (typeof comparator === 'function') {376    return comparator as (a: unknown, b: unknown) => boolean;377  }378  switch (comparator) {379    case 'IsStrictlyEqual':380      return (a, b) => a === b;381    case 'SameValue':382      return (a, b) => Object.is(a, b);383    case 'SameValueZero':384      return (a, b) => (a === 0 && b === 0) || Object.is(a, b);385  }386}387type SelectorType<T = unknown, U = unknown> = UniqueArrayConstraints<T, U>['selector'];388function selectorArbitrary(): fc.Arbitrary<SelectorType> {389  return fc.func(fc.anything());390}391function resolveSelectorFunction<T, U>(selector: SelectorType<T, U> | undefined): (a: unknown) => unknown {392  if (selector === undefined) {393    return (a) => a;394  }395  return selector as (a: unknown) => unknown;...

Using AI Code Generation

1import {sampledSelectedValues} from 'fast-check'2const sample = sampledSelectedValues([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 5)3console.log(sample)4import { property } from 'fast-check'5const sample = property([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], (t, size) => {6  return sampledSelectedValues(t, 5, size)7})8console.log(sample)

Using AI Code Generation

1import {sampledSelectedValues} from 'fast-check';2import {Arbitrary} from 'fast-check/lib/check/arbitrary/definition/Arbitrary';3const arbitrary = new Arbitrary();4arbitrary.sampledSelectedValues([1,2,3], 2);5import {sampledSelectedValues} from 'fast-check';6import {Arbitrary} from 'fast-check/lib/check/arbitrary/definition/Arbitrary';7const arbitrary = new Arbitrary();8arbitrary.sampledSelectedValues([1,2,3], 2);966     sampledSelectedValues(values: T[], nbValues: number): Arbitrary<T[]>;1066     sampledSelectedValues(values: T[], nb

Using AI Code Generation

1import * as fc from "fast-check";2import { sampledSelectedValues } from "fast-check-monorepo";3const arb = fc.integer(1, 10);4const values = sampledSelectedValues(arb);5import * as fc from "fast-check";6import { sampledSelectedValues } from "fast-check";7const arb = fc.integer(1, 10);8const values = sampledSelectedValues(arb);9import * as fc from "fast-check";10const arb = fc.integer(1, 10);11const values = fc.sampledSelectedValues(arb);12import * as fc from "fast-check";13const arb = fc.integer(1, 10);14const values = fc.sampledSelectedValues(arb);15import * as fc from "fast-check";16const arb = fc.integer(1, 10);17const values = fc.sampledSelectedValues(arb);18import * as fc from "fast-check";19const arb = fc.integer(1, 10);20const values = fc.sampledSelectedValues(ar

Using AI Code Generation

1const fc = require("fast-check");2const { sampleSelectedValues } = require("fast-check");3const { sample } = require("fast-check");4const sampleSelectedValues = (data, n) => {5  const result = [];6  for (let i = 0; i < n; ++i) {7    const index = Math.floor(Math.random() * (data.length - i));8    result.push(data[index]);9    data[index] = data[data.length - i - 1];10  }11  return result;12};13const data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];14const n = 10;15console.log(sampleSelectedValues(data, n));16{17"dependencies": {18  }19}20{21  "dependencies": {22    "fast-check": {

Using AI Code Generation

1const fc = require('fast-check');2const {sampledSelectedValues} = require('fast-check/lib/check/arbitrary/SampledValuesArbitrary');3const randomArray = sampledSelectedValues(10, fc.integer(-100, 100)).generate(fc.random());4console.log(randomArray);5const mean = randomArray.reduce((a, b) => a + b) / randomArray.length;6console.log('mean: ' + mean);7const stdDev = Math.sqrt(randomArray.reduce((a, b) => a + Math.pow(b - mean, 2), 0) / randomArray.length);8console.log('stdDev: ' + stdDev);

Using AI Code Generation

1import { functionUnderTest } from './functionUnderTest';2import { sampledSelectedValues } from 'fast-check';3import { Arbitrary } from 'fast-check';4import { sample } from 'fast-check';5import { sampleSize } from 'fast-check';6import { assert } from 'chai';7const sampleOfValues = sample(8  sampleSize(100),9  new Arbitrary(functionUnderTest)10);11function testFunctionUnderTest(value) {12  assert.equal(functionUnderTest(value), value);13}14sampledSelectedValues(sampleOfValues).forEach(testFunctionUnderTest);15testFunctionUnderTest();

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