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How to use biasFactorArbitrary method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

ArbitraryAssertions.ts

Source:ArbitraryAssertions.ts

...36  fc.assert(37    fc38      .property(39        fc.integer().noShrink(),40        biasFactorArbitrary(),41        fc.infiniteStream(fc.nat({ max: 20 })),42        extra,43        (seed, biasFactor, shrinkPath, extraParameters) => {44          // Arrange45          const arb = arbitraryBuilder(extraParameters);46          // Act / Assert47          let g1: Value<T> | null = arb.generate(randomFromSeed(seed), biasFactor);48          let g2: Value<T> | null = arb.generate(randomFromSeed(seed), biasFactor);49          if (noInitialContext) {50            const originalG2 = g2!;51            g2 = new Value(originalG2.value_, undefined, () => originalG2.value);52          }53          while (g1 !== null && g2 !== null) {54            assertEquality(isEqual, g1.value, g2.value, extraParameters);55            const pos = shrinkPath.next().value;56            g1 = arb.shrink(g1.value_, g1.context).getNthOrLast(pos);57            g2 = arb.shrink(g2.value_, g2.context).getNthOrLast(pos);58          }59          expect(g1).toBe(null);60          expect(g2).toBe(null);61        }62      )63      .afterEach(poisoningAfterEach),64    assertParameters65  );66}67// Optional requirements68// > The following requirements are optional as they do not break the design of fast-check when they are not totally ensured69// > But some of them are really recommended to build valid arbitraries that can be used.70export function assertProduceCorrectValues<T, U = never>(71  arbitraryBuilder: (extraParameters: U) => Arbitrary<T>,72  isCorrect: (v: T, extraParameters: U, arb: Arbitrary<T>) => void | boolean,73  options: {74    extraParameters?: fc.Arbitrary<U>;75    assertParameters?: fc.Parameters<unknown>;76  } = {}77): void {78  const { extraParameters: extra = fc.constant(undefined as unknown as U) as fc.Arbitrary<U>, assertParameters } =79    options;80  fc.assert(81    fc82      .property(83        fc.integer().noShrink(),84        biasFactorArbitrary(),85        fc.infiniteStream(fc.nat({ max: 20 })),86        extra,87        (seed, biasFactor, shrinkPath, extraParameters) => {88          // Arrange89          const arb = arbitraryBuilder(extraParameters);90          // Act / Assert91          let g: Value<T> | null = arb.generate(randomFromSeed(seed), biasFactor);92          while (g !== null) {93            assertCorrectness(isCorrect, g.value, extraParameters, arb);94            const pos = shrinkPath.next().value;95            g = arb.shrink(g.value, g.context).getNthOrLast(pos);96          }97          expect(g).toBe(null);98        }99      )100      .afterEach(poisoningAfterEach),101    assertParameters102  );103}104export function assertGenerateEquivalentTo<T, U = never>(105  arbitraryBuilderA: (extraParameters: U) => Arbitrary<T>,106  arbitraryBuilderB: (extraParameters: U) => Arbitrary<T>,107  options: {108    isEqual?: (v1: T, v2: T, extraParameters: U) => void | boolean;109    isEqualContext?: (c1: unknown, c2: unknown, extraParameters: U) => void | boolean;110    extraParameters?: fc.Arbitrary<U>;111    assertParameters?: fc.Parameters<unknown>;112  } = {}113): void {114  const {115    isEqual,116    isEqualContext,117    extraParameters: extra = fc.constant(undefined as unknown as U) as fc.Arbitrary<U>,118    assertParameters,119  } = options;120  fc.assert(121    fc122      .property(fc.integer().noShrink(), biasFactorArbitrary(), extra, (seed, biasFactor, extraParameters) => {123        // Arrange124        const arbA = arbitraryBuilderA(extraParameters);125        const arbB = arbitraryBuilderB(extraParameters);126        // Act127        const gA = arbA.generate(randomFromSeed(seed), biasFactor);128        const gB = arbB.generate(randomFromSeed(seed), biasFactor);129        // Assert130        assertEquality(isEqual, gA.value, gB.value, extraParameters);131        if (isEqualContext) {132          assertEquality(isEqualContext, gA.context, gB.context, extraParameters);133        }134      })135      .afterEach(poisoningAfterEach),136    assertParameters137  );138}139// Extra requirements140// The assertions above can be configured to push generators even further. They ensure more complex invariants.141// Following assertions are mostly derived from the one above.142// > assertShrinkProducesSameValueGivenSameSeed with option {noInitialContext:true}143// > assertGenerateProducesCorrectValues with option isCorrect: (v, _, arb) => arb.canShrinkWithoutContext(v)144// > assertShrinkProducesCorrectValues with option (v, _, arb) => arb.canShrinkWithoutContext(v)145export function assertShrinkProducesSameValueWithoutInitialContext<T, U = never>(146  arbitraryBuilder: (extraParameters: U) => Arbitrary<T>,147  options: {148    isEqual?: (v1: T, v2: T, extraParameters: U) => void | boolean;149    extraParameters?: fc.Arbitrary<U>;150    assertParameters?: fc.Parameters<unknown>;151  } = {}152): void {153  return assertProduceSameValueGivenSameSeed(arbitraryBuilder, { ...options, noInitialContext: true });154}155export function assertProduceValuesShrinkableWithoutContext<T, U = never>(156  arbitraryBuilder: (extraParameters: U) => Arbitrary<T>,157  options: {158    extraParameters?: fc.Arbitrary<U>;159    assertParameters?: fc.Parameters<unknown>;160  } = {}161): void {162  return assertProduceCorrectValues(arbitraryBuilder, (v, _, arb) => arb.canShrinkWithoutContext(v), options);163}164export function assertShrinkProducesStrictlySmallerValue<T, U = never>(165  arbitraryBuilder: (extraParameters: U) => Arbitrary<T>,166  isStrictlySmaller: (vNew: T, vOld: T, extraParameters: U) => void | boolean,167  options: {168    extraParameters?: fc.Arbitrary<U>;169    assertParameters?: fc.Parameters<unknown>;170  } = {}171): void {172  const previousValue: { value?: T } = {};173  function arbitraryBuilderInternal(...args: Parameters<typeof arbitraryBuilder>) {174    delete previousValue.value;175    return arbitraryBuilder(...args);176  }177  function isStrictlySmallerInternal(v: T, extraParameters: U) {178    try {179      if (!('value' in previousValue)) {180        return true;181      }182      const vNew = v;183      const vOld = previousValue.value!;184      try {185        const out = isStrictlySmaller(vNew, vOld, extraParameters);186        expect(out).not.toBe(false);187      } catch (err) {188        throw new Error(189          `Expect: ${fc.stringify(vNew)} to be strictly smaller than ${fc.stringify(vOld)}\n\nGot error: ${err}`190        );191      }192    } finally {193      previousValue.value = v;194    }195  }196  return assertProduceCorrectValues(arbitraryBuilderInternal, isStrictlySmallerInternal, options);197}198export function assertProduceSomeSpecificValues<T, U = never>(199  arbitraryBuilder: (extraParameters: U) => Arbitrary<T>,200  isSpecificValue: (value: T) => boolean,201  options: {202    extraParameters?: fc.Arbitrary<U>;203    assertParameters?: fc.Parameters<unknown>;204  } = {}205): void {206  let foundOne = false;207  function detectSpecificValue(value: T): boolean {208    if (isSpecificValue(value)) {209      foundOne = true;210      return false; // failure of the property211    }212    return true; // success of the property213  }214  try {215    assertProduceCorrectValues(arbitraryBuilder, detectSpecificValue, {216      ...options,217      // We default numRuns to 1000, but let user override it whenever needed218      assertParameters: { numRuns: 1000, ...options.assertParameters, endOnFailure: true },219    });220  } catch (err) {221    // no-op222  }223  expect(foundOne).toBe(true);224}225export function assertGenerateIndependentOfSize<T, U = never>(226  arbitraryBuilder: (extraParameters: U) => Arbitrary<T>,227  options: {228    isEqual?: (v1: T, v2: T, extraParameters: U) => void | boolean;229    isEqualContext?: (c1: unknown, c2: unknown, extraParameters: U) => void | boolean;230    extraParameters?: fc.Arbitrary<U>;231    assertParameters?: fc.Parameters<unknown>;232  } = {}233): void {234  const {235    extraParameters = fc.constant(undefined as unknown as U) as fc.Arbitrary<U>,236    isEqual,237    isEqualContext,238    assertParameters,239  } = options;240  assertGenerateEquivalentTo(241    (extra) => arbitraryBuilder(extra.requested),242    (extra) => withConfiguredGlobal(extra.global, () => arbitraryBuilder(extra.requested)),243    {244      extraParameters: fc.record({245        requested: extraParameters,246        global: fc.record({ defaultSizeToMaxWhenMaxSpecified: fc.boolean(), baseSize: sizeArb }, { requiredKeys: [] }),247      }),248      isEqual: isEqual !== undefined ? (a, b, extra) => isEqual(a, b, extra.requested) : undefined,249      isEqualContext: isEqualContext !== undefined ? (a, b, extra) => isEqualContext(a, b, extra.requested) : undefined,250      assertParameters,251    }252  );253}254// Various helpers255function randomFromSeed(seed: number): Random {256  return new Random(prand.xorshift128plus(seed));257}258function biasFactorArbitrary() {259  return fc.option(fc.integer({ min: 2 }), { freq: 2, nil: undefined });260}261function assertEquality<T, U>(262  isEqual: ((v1: T, v2: T, extraParameters: U) => void | boolean) | undefined,263  v1: T,264  v2: T,265  extraParameters: U266): void {267  try {268    if (isEqual) {269      const out = isEqual(v1, v2, extraParameters);270      expect(out).not.toBe(false);271    } else {272      expect(v1).toStrictEqual(v2);...

Using AI Code Generation

1const fc = require('fast-check');2const {biasFactorArbitrary} = require('fast-check-monorepo');3const arb = biasFactorArbitrary(fc.nat(), 0.5);4fc.assert(fc.property(arb, (n) => {5    console.log(n);6    return true;7}));8const arb = biasFactorArbitrary(fc.double(), 0.5);9const arb = biasFactorArbitrary(fc.double(), 0.5);10const arb = biasFactorArbitrary(fc.double(), 0.5);11const arb = biasFactorArbitrary(fc.double(), 0.5);12const arb = biasFactorArbitrary(fc.double(), 0.5);13const arb = biasFactorArbitrary(fc.double(), 0.5);

Using AI Code Generation

1const fc = require('fast-check');2const { biasFactorArbitrary } = require('fast-check/lib/check/runner/ArbitraryRunner');3const arb = fc.integer(0, 100);4const biasedArb = biasFactorArbitrary(arb, 0.5);5const biasedArb2 = biasFactorArbitrary(arb, 0.1);6const biasedArb3 = biasFactorArbitrary(arb, 0.9);7const biasedArb4 = biasFactorArbitrary(arb, 1.0);8console.log(biasedArb);9console.log(biasedArb2);10console.log(biasedArb3);11console.log(biasedArb4);12const fc = require('fast-check');13const { biasFactorArbitrary } = require('fast-check/lib/check/runner/ArbitraryRunner');14const arb = fc.integer(0, 100);15const biasedArb = biasFactorArbitrary(arb, 0.5);16const biasedArb2 = biasFactorArbitrary(arb, 0.1);17const biasedArb3 = biasFactorArbitrary(arb, 0.9);18const biasedArb4 = biasFactorArbitrary(arb, 1.0);19console.log(biasedArb);20console.log(biasedArb2);21console.log(biasedArb3);22console.log(biasedArb4);

Using AI Code Generation

1import * as fc from 'fast-check';2import { biasFactorArbitrary } from 'fast-check/lib/arbitrary/biasFactorArbitrary';3import { BiasFactor } from 'fast-check/lib/types';4import { biasArbitrary } from 'fast-check/lib/arbitrary/biasArbitrary';5import { Bias } from 'fast-check/lib/types';6import { Arbitrary } from 'fast-check/lib/types';7import { ArbitraryWithShrink } from 'fast-check/lib/types';8import { Shrinkable } from 'fast-check/lib/types';9import { Stream } from 'fast-check/lib/types';10type biasFactor = BiasFactor;11type bias = Bias;12type arbitrary = Arbitrary;13type arbitraryWithShrink = ArbitraryWithShrink;14type shrinkable = Shrinkable;15type stream = Stream;16type biasFactorArbitrary = (arg0: arbitrary, arg1: biasFactor, arg2: bias) => arbitraryWithShrink;17type biasArbitrary = (arg0: arbitrary, arg1: bias) => arbitraryWithShrink;18type shrinkableToStream = (arg0: shrinkable) => stream;19type streamToArray = (arg0: stream) => shrinkable[];20const biasFactorArbitrary: biasFactorArbitrary = (arbitrary: arbitrary, biasFactor: biasFactor, bias: bias) =>

Using AI Code Generation

1const { biasFactorArbitrary } = require("@dubzzz/fast-check");2const { biasFactorArbitrary } = require("@dubzzz/fast-check");3const { biasFactorArbitrary } = require("@dubzzz/fast-check");4const { biasFactorArbitrary } = require("@dubzzz/fast-check");5const { biasFactorArbitrary } = require("@dubzzz/fast-check");6const { biasFactorArbitrary } = require("@dubzzz/fast-check");7const { biasFactorArbitrary } = require("@dubzzz/fast-check");8const { biasFactorArbitrary } = require("@dubzzz/fast-check");

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