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How to use filterForShrinkImpl method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

CommandsArbitrary.ts

Source:CommandsArbitrary.ts

...81      return state;82    });83  }84  /** Filter commands for shrinking purposes */85  private filterForShrinkImpl(itemsRaw: Value<CommandWrapper<Model, Real, RunResult, CheckAsync>>[]) {86    if (this.replayPathPosition === 0) {87      this.replayPath = this.sourceReplayPath !== null ? ReplayPath.parse(this.sourceReplayPath) : [];88    }89    const items =90      this.replayPathPosition < this.replayPath.length91        ? this.filterOnReplay(itemsRaw)92        : this.filterOnExecution(itemsRaw);93    this.replayPathPosition += itemsRaw.length;94    return items;95  }96  shrink(97    _value: CommandsIterable<Model, Real, RunResult, CheckAsync>,98    context: unknown99  ): Stream<Value<CommandsIterable<Model, Real, RunResult, CheckAsync>>> {100    if (context === undefined) {101      return Stream.nil<Value<CommandsIterable<Model, Real, RunResult, CheckAsync>>>();102    }103    const safeContext = context as CommandsArbitraryContext<Model, Real, RunResult, CheckAsync>;104    const shrunkOnce = safeContext.shrunkOnce;105    const itemsRaw = safeContext.items;106    const items = this.filterForShrinkImpl(itemsRaw); // filter out commands that have not been executed107    if (items.length === 0) {108      return Stream.nil<Value<CommandsIterable<Model, Real, RunResult, CheckAsync>>>();109    }110    // The shrinker of commands have to keep the last item111    // because it is the one causing the failure112    const rootShrink: Stream<Value<CommandWrapper<Model, Real, RunResult, CheckAsync>>[]> = shrunkOnce113      ? Stream.nil()114      : new Stream([[]][Symbol.iterator]());115    // If the resulting shrinkable was simply built by joining the streams one by one,116    //  > stream[n] = stream[n-1].join(nextFor[n]) -- with nextFor[-1] = rootShrink117    // we would run into stack overflows when calling next to get back the 1st element (for huge n).118    // Indeed calling stream[n].next() would require to call stream[n-1].next() and so on...119    // Instead of that we define stream[n] = rootShrink.join(nextFor[0], ..., nextFor[n])120    // So that calling next on stream[n] will not have to run too many recursions...

Using AI Code Generation

1const { filterForShrinkImpl } = require('fast-check/lib/check/arbitrary/definition/FilterableArbitrary');2const { filter } = require('fast-check/lib/check/arbitrary/definition/FilterableArbitrary');3const { integer } = require('fast-check');4const { frequency } = require('fast-check/lib/check/arbitrary/FrequencyArbitrary');5const { oneof } = require('fast-check/lib/check/arbitrary/OneOfArbitrary');6const { map } = require('fast-check/lib/check/arbitrary/definition/MapArbitrary');7const { option } = require('fast-check/lib/check/arbitrary/OptionArbitrary');8const { tuple } = require('fast-check/lib/check/arbitrary/TupleArbitrary');9const { shrinkNumber } = require('fast-check/lib/check/arbitrary/NumberArbitrary');10const { shrinkString } = require('fast-check/lib/check/arbitrary/StringArbitrary');11const { shrinkArray } = require('fast-check/lib/check/arbitrary/ArrayArbitrary');12const { shrinkObject } = require('fast-check/lib/check/arbitrary/ObjectArbitrary');13const { shrinkDate } = require('fast-check/lib/check/arbitrary/DateArbitrary');14const { shrinkMap } = require('fast-check/lib/check/arbitrary/MapArbitrary');15const { shrinkSet } = require('fast-check/lib/check/arbitrary/SetArbitrary');16const { shrinkBigInt } = require('fast-check/lib/check/arbitrary/BigIntArbitrary');17const { shrinkUint8Array } = require('fast-check/lib/check/arbitrary/Uint8ArrayArbitrary');18const { cloneMethod } = require('fast-check/lib/check/symbols');19const { cloneMethod: cloneMethod$1 } = require('fast-check/lib/check/symbols');

Using AI Code Generation

1const fc = require('fast-check');2const { filterForShrinkImpl } = require('fast-check/lib/check/arbitrary/definition/FilterableArbitrary');3const myFilter = (value) => {4  return value % 2 === 0;5};6const myArbitrary = fc.integer(1, 1000);7const filteredArbitrary = filterForShrinkImpl(myArbitrary, myFilter);8fc.assert(fc.property(filteredArbitrary, value => myFilter(value)));9const { filterForShrinkImpl } = require('fast-check/lib/check/arbitrary/definition/FilterableArbitrary');

Using AI Code Generation

1const fc = require('fast-check');2const { filterForShrinkImpl } = require('fast-check/lib/check/arbitrary/definition/FilterableArbitrary');3const { stringify } = require('fast-check/lib/utils/JsonStringify');4const a = fc.integer(0, 100);5const b = filterForShrinkImpl(a, (x) => x % 2 === 0);6const c = filterForShrinkImpl(b, (x) => x % 5 === 0);7const d = c.shrinkableFor(20);8const e = d.filter((x) => x % 10 === 0);9const f = e.shrink();10const g = f.next();11const h = g.value;12const fc = require('fast-check');13const { stringify } = require('fast-check/lib/utils/JsonStringify');14const a = fc.integer(0, 100);15const b = a.filter((x) => x % 2 === 0);16const c = b.filter((x) => x % 5 === 0);17const d = c.shrinkableFor(20);18const e = d.filter((x) => x % 10 === 0);19const f = e.shrink();20const g = f.next();21const h = g.value;

Using AI Code Generation

1const { filterForShrinkImpl } = require('fast-check');2const { filter } = require('rxjs/operators');3const { of } = require('rxjs');4const myFilter = filter((value) => value % 2 === 0);5const myFilterForShrinkImpl = filterForShrinkImpl(myFilter);6const myObservable = of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);7myObservable.pipe(myFilterForShrinkImpl).subscribe((value) => console.log(value));

Using AI Code Generation

1const { filterForShrinkImpl } = require('fast-check');2const shrinkString = filterForShrinkImpl(3  { type: 'string' },4  s => s.slice(1)5);6const shrinked = shrinkString('hello');7console.log(shrinked);

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