How to use mustGenerateFirst method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

FrequencyArbitrary.ts

Source:FrequencyArbitrary.ts

...58    }59    this.totalWeight = currentWeight;60  }61  generate(mrng: Random, biasFactor: number | undefined): Value<T> {62    if (this.mustGenerateFirst()) {63      // index=0 can be selected even if it has a weight equal to zero64      return this.safeGenerateForIndex(mrng, 0, biasFactor);65    }66    const selected = mrng.nextInt(this.computeNegDepthBenefit(), this.totalWeight - 1);67    for (let idx = 0; idx !== this.cumulatedWeights.length; ++idx) {68      if (selected < this.cumulatedWeights[idx]) {69        return this.safeGenerateForIndex(mrng, idx, biasFactor);70      }71    }72    throw new Error(`Unable to generate from fc.frequency`);73  }74  canShrinkWithoutContext(value: unknown): value is T {75    return this.canShrinkWithoutContextIndex(value) !== -1;76  }77  shrink(value: T, context?: unknown): Stream<Value<T>> {78    if (context !== undefined) {79      const safeContext = context as _FrequencyArbitraryContext<T>;80      const selectedIndex = safeContext.selectedIndex;81      const originalBias = safeContext.originalBias;82      const originalArbitrary = this.warbs[selectedIndex].arbitrary;83      const originalShrinks = originalArbitrary84        .shrink(value, safeContext.originalContext)85        .map((v) => this.mapIntoValue(selectedIndex, v, null, originalBias));86      if (safeContext.clonedMrngForFallbackFirst !== null) {87        if (safeContext.cachedGeneratedForFirst === undefined) {88          safeContext.cachedGeneratedForFirst = this.safeGenerateForIndex(89            safeContext.clonedMrngForFallbackFirst,90            0,91            originalBias92          );93        }94        const valueFromFirst = safeContext.cachedGeneratedForFirst;95        return Stream.of(valueFromFirst).join(originalShrinks);96      }97      return originalShrinks;98    }99    const potentialSelectedIndex = this.canShrinkWithoutContextIndex(value);100    if (potentialSelectedIndex === -1) {101      return Stream.nil(); // No arbitrary found to accept this value102    }103    return this.defaultShrinkForFirst(potentialSelectedIndex).join(104      this.warbs[potentialSelectedIndex].arbitrary105        .shrink(value, undefined) // re-checked by canShrinkWithoutContextIndex106        .map((v) => this.mapIntoValue(potentialSelectedIndex, v, null, undefined))107    );108  }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....

Using AI Code Generation

1const { mustGenerateFirst } = require("fast-check-monorepo");2const { mustGenerateFirst } = require("fast-check-monorepo");3const { mustGenerateFirst } = require("fast-check-monorepo");4const { mustGenerateFirst } = require("fast-check-monorepo");5const { mustGenerateFirst } = require("fast-check-monorepo");6const { mustGenerateFirst } = require("fast-check-monorepo");7const { mustGenerateFirst } = require("fast-check-monorepo");8const { mustGenerateFirst } = require("fast-check-monorepo");9const { mustGenerateFirst } = require("fast-check-monorepo");10const { mustGenerateFirst } = require("fast-check-monorepo");11const { mustGenerateFirst } = require("fast-check-monorepo");12const { mustGenerateFirst } = require("fast-check-monorepo");13const { mustGenerateFirst } = require("fast-check-monorepo");14const { mustGenerateFirst } = require("fast-check-monorepo");

Using AI Code Generation

1const { mustGenerateFirst } = require("fast-check");2const { mustGenerateFirst } = require("fast-check");3const { mustGenerateFirst } = require("fast-check");4const { mustGenerateFirst } = require("fast-check");5const { mustGenerateFirst } = require("fast-check");6const { mustGenerateFirst } = require("fast-check");7const { mustGenerateFirst } = require("fast-check");8const { mustGenerateFirst } = require("fast-check");9const { mustGenerateFirst } = require("fast-check");10const { mustGenerateFirst } = require("fast-check");11const { mustGenerateFirst } = require("fast-check");12const { mustGenerateFirst } = require("fast-check");13const { mustGenerateFirst } = require("fast-check");14const { mustGenerateFirst } = require("fast-check");15const { mustGenerateFirst } = require("fast-check");16const { mustGenerateFirst } = require("fast-check");17const { mustGenerateFirst } = require("fast

Using AI Code Generation

1const { mustGenerateFirst } = require('fast-check');2const { integer } = require('fast-check');3const { string } = require('fast-check');4const { mustGenerateFirst } = require('fast-check-monorepo');5const { integer } = require('fast-check-monorepo');6const { string } = require('fast-check-monorepo');7const { mustGenerateFirst } = require('fast-check');8const { integer } = require('fast-check');9const { string } = require('fast-check');10const { mustGenerateFirst } = require('fast-check-monorepo');11const { integer } = require('fast-check-monorepo');12const { string } = require('fast-check-monorepo');13const { mustGenerateFirst } = require('fast-check');14const { integer } = require('fast-check');15const { string } = require('fast-check');16const { mustGenerateFirst } = require('fast-check-monorepo');17const { integer } = require('fast-check-monorepo');18const { string } = require('fast-check-monorepo');19const { mustGenerateFirst } = require('fast-check');20const { integer } = require('fast-check');21const { string } = require('fast-check');22const { mustGenerateFirst } = require('fast-check-monorepo');23const { integer } = require('fast-check-monorepo');24const { string } = require('fast-check-monorepo');25const { mustGenerateFirst } = require('fast-check');26const { integer } = require('fast-check');27const { string } = require('fast-check');28const { mustGenerateFirst } = require('fast-check-monorepo');29const { integer } = require('fast

Using AI Code Generation

1const fc = require("fast-check");2const { mustGenerateFirst } = require("fast-check-monorepo");3const arb = fc.integer(1, 10);4mustGenerateFirst(arb, (x) => x > 5);5mustGenerateFirst(arb, (x) => x > 0);6const fc = require("fast-check");7const { mustGenerateFirst } = require("fast-check-monorepo");8const arb = fc.integer(1, 10);9mustGenerateFirst(arb, (x) => x > 5);10mustGenerateFirst(arb, (x) => x > 0);11const fc = require("fast-check");12const { mustGenerateFirst } = require("fast-check-monorepo");13const arb = fc.integer(1, 10);14mustGenerateFirst(arb, (x) => x > 5);15mustGenerateFirst(arb, (x) => x > 0);16const fc = require("fast-check");17const { mustGenerateFirst } = require("fast-check-monorepo");18const arb = fc.integer(1, 10);19mustGenerateFirst(arb, (x) => x > 5);20mustGenerateFirst(arb, (x) => x > 0);21const fc = require("fast-check");22const { mustGenerateFirst } = require("fast-check-monorepo

Using AI Code Generation

1const { mustGenerateFirst } = require('fast-check');2const { property } = require('fast-check');3const fc = require('fast-check');4const { mustGenerateFirst } = require('fast-check');5describe('test3', () => {6  it('test3', () => {7    const arb = fc.nat();8    const predicate = (n) => n % 2 === 0;9  });10});11const { mustGenerateFirst } = require('fast-check');12const { property } = require('fast-check');13const fc = require('fast-check');14const { mustGenerateFirst } = require('fast-check');15describe('test4', () => {16  it('test4', () => {17    const arb = fc.nat();18    const predicate = (n) => n % 2 === 0;19  });20});21const { mustGenerateFirst } = require('fast-check');22const { property } = require('fast-check');23const fc = require('fast-check');24const { mustGenerateFirst } = require('fast-check');25describe('test5', () => {26  it('test5', () => {27    const arb = fc.nat();28    const predicate = (n) => n % 2 === 0;29  });30});31const { mustGenerateFirst } = require('fast-check');32const { property } = require('fast-check');33const fc = require('fast-check');34const { mustGenerateFirst } = require('fast-check');35describe('test6', () => {36  it('test6', () => {37    const arb = fc.nat();38    const predicate = (n) => n % 2 === 0;39    mustGenerateFirst(arb,

Using AI Code Generation

1const fc = require('fast-check');2const { generate, mustGenerateFirst } = require('fast-check-monorepo');3const test = () => {4    mustGenerateFirst(5        fc.integer(),6        (i) => i < 07    );8};9generate(test, {seed: 42, numRuns: 1000});

Using AI Code Generation

1const { mustGenerateFirst } = require('fast-check');2const { isEven } = require('./test1');3const result = mustGenerateFirst((x) => {4  if (isEven(x)) {5    return x;6  }7  return false;8});9console.log(result);10const { mustGenerateFirst } = require('fast-check');11const { isEven } = require('./test1');12const result = mustGenerateFirst((x) => {13  if (isEven(x)) {14    return x;15  }16  return false;17});18console.log(result);19const { mustGenerateFirst } = require('fast-check');20const { isEven } = require('./test1');21const result = mustGenerateFirst((x) => {22  if (isEven(x)) {23    return x;24  }25  return false;26});27console.log(result);

Using AI Code Generation

1const { mustGenerateFirst } = require('fast-check');2const fc = require('fast-check');3const sum = (a, b) => a + b;4const sumMoreThanZero = (a) => {5  const sumOfArray = a.reduce(sum);6  return sumOfArray > 0;7};8const sumLessThan100 = (a) => {9  const sumOfArray = a.reduce(sum);10  return sumOfArray < 100;11};12const sumIsBetween0And100 = (a) => {13  return sumMoreThanZero(a) && sumLessThan100(a);14};15const test = () => {16  const array = mustGenerateFirst(fc.array(fc.integer(), 10));17  return sumIsBetween0And100(array);18};19test();20    at Context.<anonymous> (test3.js:39:18)21    at processImmediate (internal/timers.js:456:21)22mustGenerateFirst(fc.array(fc.integer(), 10))

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