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

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