KaneAI - World’s First E2E Software Testing Agent.Book a Demo Join TestMu Conference

How to use mustFallbackToFirstInShrink method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

FrequencyArbitrary.ts

Source:FrequencyArbitrary.ts

...109  /** Generate shrink values for first arbitrary when no context and no value was provided */110  private defaultShrinkForFirst(selectedIndex: number): Stream<Value<T>> {111    ++this.context.depth; // increase depth112    try {113      if (!this.mustFallbackToFirstInShrink(selectedIndex) || this.warbs[0].fallbackValue === undefined) {114        // Not applicable: no fallback to first arbitrary on shrink OR no hint to shrink without an initial value and context115        return Stream.nil();116      }117    } finally {118      --this.context.depth; // decrease depth (reset depth)119    }120    // The arbitrary at [0] accepts to shrink fallbackValue.default without any context (context=undefined)121    const rawShrinkValue = new Value(this.warbs[0].fallbackValue.default, undefined);122    return Stream.of(this.mapIntoValue(0, rawShrinkValue, null, undefined));123  }124  /** Extract the index of the generator that would have been able to gennrate the value */125  private canShrinkWithoutContextIndex(value: unknown): number {126    if (this.mustGenerateFirst()) {127      return this.warbs[0].arbitrary.canShrinkWithoutContext(value) ? 0 : -1;128    }129    try {130      ++this.context.depth; // increase depth131      for (let idx = 0; idx !== this.warbs.length; ++idx) {132        const warb = this.warbs[idx];133        if (warb.weight !== 0 && warb.arbitrary.canShrinkWithoutContext(value)) {134          return idx;135        }136      }137      return -1;138    } finally {139      --this.context.depth; // decrease depth (reset depth)140    }141  }142  /** Map the output of one of the children with the context of frequency */143  private mapIntoValue(144    idx: number,145    value: Value<T>,146    clonedMrngForFallbackFirst: Random | null,147    biasFactor: number | undefined148  ): Value<T> {149    const context: _FrequencyArbitraryContext<T> = {150      selectedIndex: idx,151      originalBias: biasFactor,152      originalContext: value.context,153      clonedMrngForFallbackFirst,154    };155    return new Value(value.value, context);156  }157  /** Generate using Arbitrary at index idx and safely handle depth context */158  private safeGenerateForIndex(mrng: Random, idx: number, biasFactor: number | undefined): Value<T> {159    ++this.context.depth; // increase depth160    try {161      const value = this.warbs[idx].arbitrary.generate(mrng, biasFactor);162      const clonedMrngForFallbackFirst = this.mustFallbackToFirstInShrink(idx) ? mrng.clone() : null;163      return this.mapIntoValue(idx, value, clonedMrngForFallbackFirst, biasFactor);164    } finally {165      --this.context.depth; // decrease depth (reset depth)166    }167  }168  /** Check if generating a value based on the first arbitrary is compulsory */169  private mustGenerateFirst(): boolean {170    return this.constraints.maxDepth <= this.context.depth;171  }172  /** Check if fallback on first arbitrary during shrinking is required */173  private mustFallbackToFirstInShrink(idx: number): boolean {174    return idx !== 0 && this.constraints.withCrossShrink && this.warbs[0].weight !== 0;175  }176  /** Compute the benefit for the current depth */177  private computeNegDepthBenefit(): number {178    const depthBias = this.constraints.depthBias;179    if (depthBias <= 0 || this.warbs[0].weight === 0) {180      return 0;181    }182    // We use a pow-based biased benefit as the deeper we go the more chance we have183    // to encounter thousands of instances of the current arbitrary.184    const depthBenefit = safeMathFloor(safeMathPow(1 + depthBias, this.context.depth)) - 1;185    // -0 has to be converted into 0 thus we call ||0186    return -safeMathMin(this.totalWeight * depthBenefit, safeMaxSafeInteger) || 0;187  }...

Using AI Code Generation

1const { mustFallbackToFirstInShrink } = require("fast-check");2const { mustFallbackToFirstInShrink } = require("fast-check/lib/types/arbitrary/mustFallbackToFirstInShrink");3const { mustFallbackToFirstInShrink } = require("fast-check/lib/types/arbitrary/mustFallbackToFirstInShrink.js");4const { mustFallbackToFirstInShrink } = require("fast-check/lib/types/arbitrary/mustFallbackToFirstInShrink.ts");5const { mustFallbackToFirstInShrink } = require("fast-check/lib/types/arbitrary/mustFallbackToFirstInShrink.tsx");6const { mustFallbackToFirstInShrink } = require("fast-check/lib/types/arbitrary/mustFallbackToFirstInShrink.jsx");7const { mustFallbackToFirstInShrink } = require("fast-check/lib/types/arbitrary/mustFallbackToFirstInShrink.json");8const { mustFallbackToFirstInShrink } = require("fast-check/lib/types/arbitrary/mustFallbackToFirstInShrink.json5");9const { mustFallbackToFirstInShrink } = require("fast-check/lib/types/arbitrary/mustFallbackToFirstInShrink.mjs");10const { mustFallbackToFirstInShrink } = require("fast-check/lib/types/arbitrary/mustFallbackToFirstInShrink.cjs");11const { mustFallbackToFirstInShrink } = require("fast-check/lib/types/arbitrary/mustFallbackToFirstInShrink.html");12const { mustFallbackToFirstInShrink } = require("

Using AI Code Generation

1import { mustFallbackToFirstInShrink } from 'fast-check-monorepo';2import { mustFallbackToFirstInShrink } from 'fast-check-monorepo';3import { mustFallbackToFirstInShrink } from 'fast-check-monorepo';4import { mustFallbackToFirstInShrink } from 'fast-check-monorepo';5import { mustFallbackToFirstInShrink } from 'fast-check-monorepo';6import { mustFallbackToFirstInShrink } from 'fast-check-monorepo';7import { mustFallbackToFirstInShrink } from 'fast-check-monorepo';8import { mustFallbackToFirstInShrink } from 'fast-check-monorepo';9import { mustFallbackToFirstInShrink } from 'fast-check-monorepo';10import { mustFallbackToFirstInShrink } from 'fast-check-monorepo';11import { mustFallbackToFirstInShrink } from 'fast-check-monore

Using AI Code Generation

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

Using AI Code Generation

1const fc = require('fast-check');2const { mustFallbackToFirstInShrink } = require('fast-check/lib/check/runner/Runner');3const { fakeRunner } = require('fast-check/lib/check/runner/FakeRunner');4const { fakeRandom } = require('fast-check/lib/random/generator/FakeRandom');5const { fakeNextArbitrary } = require('fast-check/lib/arbitrary/_internals/FakeNextArbitrary');6const { fakeShrinkable } = require('fast-check/lib/arbitrary/_internals/FakeShrinkable');7const { fakeInteger } = require('fast-check/lib/arbitrary/integer/FakeIntegerArbitrary');8const { fakeObject } = require('fast-check/lib/arbitrary/object/FakeObjectArbitrary');9const { fakeString } = require('fast-check/lib/arbitrary/string/FakeStringArbitrary');10const { fakeDate } = require('fast-check/lib/arbitrary/date/FakeDateArbitrary');11const { fakeArray } = require('fast-check/lib/arbitrary/array/FakeArrayArbitrary');12const { fakeTuple } = require('fast-check/lib/arbitrary/tuple/FakeTupleArbitrary');13const { fakeRecord } = require('fast-check/lib/arbitrary/record/FakeRecordArbitrary');14const { fakeConstant } = require('fast-check/lib/arbitrary/constant/FakeConstantArbitrary');15const { fakeConstantFrom } = require('fast-check/lib/arbitrary/constantFrom/FakeConstantFromArbitrary');16const { fakeOneof } = require('fast-check/lib/arbitrary/oneof/FakeOneofArbitrary');17const { fakeBoolean } = require('fast-check/lib/arbitrary/boolean/FakeBooleanArbitrary');18const { fakeSubarray } = require('fast-check/lib/arbitrary/subarray/FakeSubarrayArbitrary');19const { fakeSet } = require('fast-check/lib/arbitrary/set/FakeSetArbitrary');20const { fakeMap } = require('fast-check/lib/arbitrary/map/FakeMapArbitrary');21const { fakeUnicodeString } = require('fast-check/lib/arbitrary/unicodeString/FakeUnicodeStringArbitrary');22const { fakeJson } = require('fast-check/lib/arbitrary/json/FakeJsonArbitrary');23const { fakeCloneMethod } = require('fast-check/lib/arbitrary/_internals/FakeCloneMethod');

Using AI Code Generation

1const fc = require("fast-check");2const { mustFallbackToFirstInShrink } = require("fast-check/lib/check/runner/ArbitraryWithShrink");3describe("mustFallbackToFirstInShrink", () => {4  it("should return true if the first element of the array is the same as the one that was shrunk", () => {5    fc.assert(6      fc.property(fc.array(fc.integer()), (arr) => {7        const first = arr[0];8        const shrunk = fc.shrinkArray(arr);9        return mustFallbackToFirstInShrink(shrunk, first);10      })11    );12  });13});14const fc = require("fast-check");15const { mustFallbackToFirstInShrink } = require("fast-check-monorepo/lib/check/runner/ArbitraryWithShrink");16describe("mustFallbackToFirstInShrink", () => {17  it("should return true if the first element of the array is the same as the one that was shrunk", () => {18    fc.assert(19      fc.property(fc.array(fc.integer()), (arr) => {20        const first = arr[0];21        const shrunk = fc.shrinkArray(arr);22        return mustFallbackToFirstInShrink(shrunk, first);23      })24    );25  });26});27const fc = require("fast-check");28const { mustFallbackToFirstInShrink } = require("fast-check-monorepo/lib/check/runner/ArbitraryWithShrink");29describe("mustFallbackToFirstInShrink", () => {30  it("should return true

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.