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How to use schedulerTemplatedString method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

AsyncScheduler.spec.ts

Source:AsyncScheduler.spec.ts

1import fc from '../../src/fast-check';2import { seed } from './seed';3describe(`AsyncScheduler (seed: ${seed})`, () => {4  it('should detect trivial race conditions', async () => {5    // The code below relies on the fact/expectation that fetchA takes less time that fetchB6    // The aim of this test is to show that the code is wrong as soon as this assumption breaks7    type CompoProps = { fetchHeroName: () => Promise<string>; fetchHeroes: () => Promise<{ name: string }[]> };8    type CompoState = { heroName: string | undefined; heroes: { name: string }[] | undefined };9    class Compo {10      private props: CompoProps;11      private state: CompoState;12      constructor(props: CompoProps) {13        this.props = props;14        this.state = { heroName: undefined, heroes: undefined };15      }16      componentDidMount() {17        this.props.fetchHeroName().then((heroName) => (this.state = { ...this.state, heroName }));18        this.props.fetchHeroes().then((heroes) => (this.state = { ...this.state, heroes }));19      }20      render() {21        const { heroName, heroes } = this.state;22        if (!heroes) return null;23        return `got: ${heroes.find((h) => h.name === heroName!.toLowerCase())}`;24      }25    }26    const out = await fc.check(27      fc.asyncProperty(fc.scheduler(), async (s) => {28        const fetchHeroName = s.scheduleFunction(function fetchHeroName() {29          return Promise.resolve('James Bond');30        });31        const fetchHeroes = s.scheduleFunction(function fetchHeroesById() {32          return Promise.resolve([{ name: 'James Bond' }]);33        });34        const c = new Compo({ fetchHeroName, fetchHeroes });35        c.componentDidMount();36        c.render();37        while (s.count() !== 0) {38          await s.waitOne();39          c.render();40        }41      }),42      { seed }43    );44    expect(out.failed).toBe(true);45    expect(out.counterexample![0].toString()).toEqual(46      'schedulerFor()`\n' +47        '-> [task${2}] function::fetchHeroesById() resolved with value [{"name":"James Bond"}]\n' +48        '-> [task${1}] function::fetchHeroName() pending`'49    );50    // Node  <16: Cannot read property 'toLowerCase' of undefined51    // Node >=16: TypeError: Cannot read properties of undefined (reading 'toLowerCase')52    expect(out.error).toContain(`'toLowerCase'`);53  });54  it('should detect race conditions leading to infinite loops', async () => {55    // Following case is an example of code trying to scan all the dependencies of a given package56    // In order to build a nice graph57    type PackageDefinition = {58      dependencies: { [packageName: string]: string };59    };60    type AllPackagesDefinition = { [packageName: string]: PackageDefinition };61    const allPackages: AllPackagesDefinition = {62      toto: {63        dependencies: {64          titi: '^1.0.0',65          tata: '^2.0.0',66          tutu: '^3.0.0',67        },68      },69      titi: {70        dependencies: {71          noop: '^1.0.0',72          tutu: '^3.0.0',73        },74      },75      tata: {76        dependencies: {77          noop: '^1.0.0',78        },79      },80      noop: {81        dependencies: {},82      },83      tutu: {84        dependencies: {85          titi: '^1.0.0',86        },87      },88    };89    const buildGraph = async (90      initialPackageName: string,91      fetch: (packageName: string) => Promise<PackageDefinition>92    ) => {93      const cache: AllPackagesDefinition = {};94      // // Uncomment to remove the bug95      //const cachePending = new Set<string>();96      const feedCache = async (packageName: string) => {97        // // Uncomment to remove the bug98        // if (cachePending.has(packageName)) return;99        // cachePending.add(packageName);100        if (cache[packageName]) return;101        const packageDef = await fetch(packageName); // cache miss102        // eslint-disable-next-line require-atomic-updates103        cache[packageName] = packageDef;104        await Promise.all(Object.keys(packageDef.dependencies).map((dependencyName) => feedCache(dependencyName)));105      };106      await feedCache(initialPackageName);107      return cache; // we just return the cache instead of the garph for simplicity108    };109    const out = await fc.check(110      fc.asyncProperty(fc.constantFrom(...Object.keys(allPackages)), fc.scheduler(), async (initialPackageName, s) => {111        let numFetches = 0;112        const originalFetch = (packageName: string) => {113          ++numFetches;114          return Promise.resolve(allPackages[packageName]);115        };116        const fetch = s.scheduleFunction(originalFetch);117        const handle = buildGraph(initialPackageName, fetch);118        // Or: await s.waitAll();119        while (s.count() !== 0) {120          expect(numFetches).toBeLessThanOrEqual(Object.keys(allPackages).length);121          await s.waitOne();122        }123        await handle; // nothing should block now124      }),125      { seed }126    );127    expect(out.failed).toBe(true);128  });129  it('should be able to replay failures using examples and the value of schedulerFor extracted from error logs', async () => {130    const inc = async (db: { read: () => Promise<number>; write: (n: number) => Promise<void> }) => {131      const v = await db.read();132      await db.write(v + 1);133    };134    const propertyValidator = async (s: fc.Scheduler) => {135      let value = 0;136      const db = {137        read: s.scheduleFunction(async function read() {138          return value;139        }),140        write: s.scheduleFunction(async function write(n: number) {141          value = n;142        }),143      };144      s.schedule(Promise.resolve('A')).then(() => inc(db));145      s.schedule(Promise.resolve('B')).then(() => inc(db));146      s.schedule(Promise.resolve('C')).then(() => inc(db));147      await s.waitAll();148      expect(value).toBe(3);149    };150    const out = await fc.check(fc.asyncProperty(fc.scheduler(), propertyValidator));151    expect(out.failed).toBe(true);152    const schedulerTemplatedString = String(out.counterexample![0]);153    const argsForSchedulerFor: any[] = eval(`(() => {154      // Extract template string parameters155      function schedulerFor() {156        return function(strs, ...ordering) {157          return [strs, ...ordering];158        }159      }160      return ${schedulerTemplatedString};161    })()`);162    const outRetry = await fc.check(fc.asyncProperty(fc.scheduler(), propertyValidator), {163      examples: [[(fc.schedulerFor() as any)(...argsForSchedulerFor)]],164    });165    expect(outRetry.failed).toBe(true);166    expect(outRetry.numRuns).toBe(1);167    const cleanError = (error: string) => {168      return error.replace(/AsyncScheduler\.spec\.ts:\d+:\d+/g, 'AsyncScheduler.spec.ts:*:*');169    };170    expect(cleanError(outRetry.error!)).toBe(cleanError(out.error!));171    expect(String(outRetry.counterexample![0])).toBe(String(out.counterexample![0]));172  });...

Using AI Code Generation

1const { schedulerTemplatedString } = require('fast-check-monorepo');2console.log(schedulerTemplatedString());3const { schedulerTemplatedString } = require('fast-check-monorepo');4console.log(schedulerTemplatedString());5const { schedulerTemplatedString } = require('fast-check-monorepo');6console.log(schedulerTemplatedString());7const { schedulerTemplatedString } = require('fast-check-monorepo');8console.log(schedulerTemplatedString());9const { schedulerTemplatedString } = require('fast-check-monorepo');10console.log(schedulerTemplatedString());11const { schedulerTemplatedString } = require('fast-check-monorepo');12console.log(schedulerTemplatedString());13const { schedulerTemplatedString } = require('fast-check-monorepo');14console.log(schedulerTemplatedString());

Using AI Code Generation

1const { schedulerTemplatedString } = require('fast-check');2const { scheduler } = require('rxjs');3const { TestScheduler } = require('rxjs/testing');4const testScheduler = new TestScheduler((actual, expected) => {5  expect(actual).toEqual(expected);6});7const run = () => {8  testScheduler.run(({ cold, expectObservable }) => {9    const values = { a: 1, b: 2, c: 3 };10    const source$ = cold('-a-b-c-|', values);11    const expected$ = cold('-a-b-c-|', values);12    expectObservable(source$).toBe('-a-b-c-|', values);13  });14};15run();16  ✕ rxjs (3 ms)17    -   Object {18    -     "notification": Object {19    -     },20    -   },21    -   Object {22    -     "notification": Object {23    -     },24    -   },25    -   Object {26    -     "notification": Object {27    -     },28    -   },29    -   Object {30    -     "notification": Object {31    -     },32    -   },33    +   Object {34    +     "notification": Object {35    +     },36    +   },37    +   Object {

Using AI Code Generation

1const { schedulerTemplatedString } = require("fast-check");2const { scheduler } = require("@most/scheduler");3const { runEffects, tap } = require("@most/core");4const { newDefaultScheduler } = require("@most/scheduler");5const { periodic } = require("@most/core");6const { take } = require("@most/core");7const { observe } = require("@most/core");8const { map } = require("@most/core");9const { chain } = require("@most/core");10const { ap } = require("@most/core");11const { mergeArray } = require("@most/core");12const { merge } = require("@most/core");13const { of } = require("@most/core");14const { scan } = require("@most/core");15const { join } = require("@most/core");16const { startWith } = require("@most/core");17const { switchLatest } = require("@most/core");18const { continueWith } = require("@most/core");19const { concat } = require("@most/core");20const { filter } = require("@most/core");21const { skipRepeats } = require("@most/core");22const { skip } = require("@most/core");23const { skipUntil } = require("@most/core");24const { skipWhile } = require("@most/core");25const { takeUntil } = require("@most/core");26const { takeWhile } = require("@most/core");27const { until } = require("@most/core");28const { withLatestFrom } = require("@most/core");29const { sample } = require("@most/core");30const { fromPromise } = require("@most/core");31const { fromEvent } = require("@most/core");32const { unfold } = require("@most/core");33const { iterate } = require("@most/core");34const { generate } = require("@most/core");35const { throwError } = require("@most/core");36const { empty } = require("@most/core");37const { never } = require("@most/core");38const { from } = require("@most/core");39const { run } = require("@most/core");40const { Stream } = require("@most/types");41const { Scheduler } = require("@most/types");42const { Disposable } = require("@most/types");43const { Sink } = require("@most/types");44const { Time } = require("@most/types");45const { PropagateTask } = require("@most/types");46const { ScheduledTask } = require("@most/types");47const { Task } = require("@most/types");

Using AI Code Generation

1const { schedulerTemplatedString } = require('fast-check-monorepo');2const { scheduler } = require('fast-check/scheduler/Scheduler');3const { run } = require('fast-check/scheduler/Runner');4const result = run(scheduler, schedulerTemplatedString('Hello World'));5const { schedulerTemplatedString } = require('fast-check-monorepo');6const { scheduler } = require('fast-check/scheduler/Scheduler');7const { run } = require('fast-check/scheduler/Runner');8const result = run(scheduler, schedulerTemplatedString('Hello World'));9const { schedulerTemplatedString } = require('fast-check-monorepo');10const { scheduler } = require('fast-check/scheduler/Scheduler');11const { run } = require('fast-check/scheduler/Runner');12const result = run(scheduler, schedulerTemplatedString('Hello World'));13const { schedulerTemplatedString } = require('fast-check-monorepo');14const { scheduler } = require('fast-check/scheduler/Scheduler');15const { run } = require('fast-check/scheduler/Runner');16const result = run(scheduler, schedulerTemplatedString('Hello World'));17const { schedulerTemplatedString } = require('fast-check-monorepo');18const { scheduler } = require('fast-check/scheduler/Scheduler');19const { run } = require('fast-check/scheduler/Runner');20const result = run(scheduler, schedulerTemplatedString('Hello World'));21const { schedulerTemplatedString } = require('fast-check-monorepo');22const { scheduler } = require('fast-check/scheduler/Scheduler');23const {

Using AI Code Generation

1import { schedulerTemplatedString } from 'fast-check-monorepo';2import { run } from 'rxjs-marbles/jest';3import { map } from 'rxjs/operators';4const scheduler = schedulerTemplatedString`--a--b--c--d--e--f--g--h--i--j--|`;5const expected = schedulerTemplatedString`--a--b--c--d--e--f--g--h--i--j--|`;6const source = schedulerTemplatedString`-a-b-c-d-e-f-g-h-i-j-|`;7run(({ cold, expectObservable }) => {8  const input$ = cold(source);9  const result$ = input$.pipe(map((x) => x));10  expectObservable(result$).toBe(expected);11}, { scheduler });12function schedulerTemplatedString(13): string;14import { schedulerTemplatedString } from 'fast-check-monorepo';15import { run } from 'rxjs-marbles/jest';16import { map } from 'rxjs/operators';17const scheduler = schedulerTemplatedString`--a--b--c--d--e--f--g--h--i--j--|`;18const expected = schedulerTemplatedString`--a--b--c--d--e--f--g--h--i--j--|`;19const source = schedulerTemplatedString`-a-b-c-d-e-f-g-h-i-j-|`;20run(({ cold, expectObservable }) => {21  const input$ = cold(source);22  const result$ = input$.pipe(map((x) => x));23  expectObservable(result$).toBe(expected

Using AI Code Generation

1const fs = require('fs');2const fastCheck = require('fast-check');3const { schedulerTemplatedString } = require('fast-check-monorepo/test/unit/check/arbitrary/AsyncSchedulerArbitrary.spec.ts');4const testCases = schedulerTemplatedString().generate(fastCheck.mutable.string()).value;5const fs = require('fs');6const fastCheck = require('fast-check');7const { schedulerTemplatedString } = require('fast-check-monorepo/test/unit/check/arbitrary/AsyncSchedulerArbitrary.spec.ts');8const testCases = schedulerTemplatedString().generate(fastCheck.mutable.string()).value;9const fs = require('fs');10const fastCheck = require('fast-check');11const { schedulerTemplatedString } = require('fast-check-monorepo/test/unit/check/arbitrary/AsyncSchedulerArbitrary.spec.ts');12const testCases = schedulerTemplatedString().generate(fastCheck.mutable.string()).value;13const fs = require('fs');14const fastCheck = require('fast-check');15const { schedulerTemplatedString } = require('fast-check-monorepo/test/unit/check/arbitrary/AsyncSchedulerArbitrary.spec.ts');16const testCases = schedulerTemplatedString().generate(fastCheck.mutable.string()).value;17const fs = require('fs');18const fastCheck = require('fast-check');19const { schedulerTemplatedString } = require('fast-check-monorepo/test

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