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

How to use SchedulerArbitrary method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

SchedulerArbitrary.spec.ts

Source:SchedulerArbitrary.spec.ts

...20      const fakeScheduler = {} as SchedulerImplemMock.SchedulerImplem<unknown>;21      const SchedulerImplem = jest.spyOn(SchedulerImplemMock, 'SchedulerImplem');22      SchedulerImplem.mockReturnValue(fakeScheduler);23      // Act24      const arb = new SchedulerArbitrary(act);25      const g = arb.generate(mrng, undefined);26      // Assert27      expect(g.value).toBe(fakeScheduler);28      expect(SchedulerImplem).toHaveBeenCalledTimes(1);29      expect(SchedulerImplem).toHaveBeenCalledWith(30        act,31        expect.objectContaining({ clone: expect.any(Function), nextTaskIndex: expect.any(Function) })32      );33      expect(clone).toHaveBeenCalledTimes(1);34      expect(clone1).toHaveBeenCalledTimes(1);35    });36    it('should build a taskScheduler pulling random values out of the cloned instance of Random', () => {37      // Arrange38      const act = jest.fn();39      const scheduledTasks = [{}, {}, {}, {}, {}, {}, {}, {}] as ScheduledTask<unknown>[];40      const { instance: mrng, clone } = fakeRandom();41      const { instance: mrng1, clone: clone1, nextInt } = fakeRandom();42      const { instance: mrng2 } = fakeRandom();43      clone.mockReturnValueOnce(mrng1);44      clone1.mockReturnValueOnce(mrng2);45      const fakeScheduler = {} as SchedulerImplemMock.SchedulerImplem<unknown>;46      const SchedulerImplem = jest.spyOn(SchedulerImplemMock, 'SchedulerImplem');47      SchedulerImplem.mockReturnValue(fakeScheduler);48      const arb = new SchedulerArbitrary(act);49      arb.generate(mrng, undefined);50      // Act51      const taskScheduler = SchedulerImplem.mock.calls[0][1];52      taskScheduler.nextTaskIndex(scheduledTasks);53      // Assert54      expect(nextInt).toHaveBeenCalledTimes(1);55      expect(nextInt).toHaveBeenCalledWith(0, scheduledTasks.length - 1);56    });57    it('should build a taskScheduler that can be cloned and create the same values', () => {58      // Arrange59      const act = jest.fn();60      const scheduledTasks = [{}, {}, {}, {}, {}, {}, {}, {}] as ScheduledTask<unknown>[];61      const { instance: mrng, clone } = fakeRandom();62      const { instance: mrng1, clone: clone1, nextInt } = fakeRandom();63      const { instance: mrng2, clone: clone2, nextInt: nextIntBis } = fakeRandom();64      const { instance: mrng3 } = fakeRandom();65      clone.mockReturnValueOnce(mrng1);66      clone1.mockImplementationOnce(() => {67        expect(nextInt).not.toHaveBeenCalled(); // if we pulled values clone is not a clone of the source68        return mrng2;69      });70      clone2.mockImplementationOnce(() => {71        expect(nextIntBis).not.toHaveBeenCalled(); // if we pulled values clone is not a clone of the source72        return mrng3;73      });74      nextInt.mockReturnValueOnce(5).mockReturnValueOnce(2);75      nextIntBis.mockReturnValueOnce(5).mockReturnValueOnce(2);76      const fakeScheduler = {} as SchedulerImplemMock.SchedulerImplem<unknown>;77      const SchedulerImplem = jest.spyOn(SchedulerImplemMock, 'SchedulerImplem');78      SchedulerImplem.mockReturnValue(fakeScheduler);79      const arb = new SchedulerArbitrary(act);80      arb.generate(mrng, undefined);81      // Act82      const taskScheduler = SchedulerImplem.mock.calls[0][1];83      const v1 = taskScheduler.nextTaskIndex(scheduledTasks);84      const v2 = taskScheduler.nextTaskIndex(scheduledTasks);85      const taskScheduler2 = taskScheduler.clone();86      const u1 = taskScheduler2.nextTaskIndex(scheduledTasks);87      const u2 = taskScheduler2.nextTaskIndex(scheduledTasks);88      // Assert89      expect(nextInt).toHaveBeenCalledTimes(2);90      expect(nextInt).toHaveBeenCalledWith(0, scheduledTasks.length - 1);91      expect(nextIntBis).toHaveBeenCalledTimes(2);92      expect(nextIntBis).toHaveBeenCalledWith(0, scheduledTasks.length - 1);93      expect(v1).toBe(u1);94      expect(v2).toBe(u2);95    });96  });97  describe('canShrinkWithoutContext', () => {98    it('should return false for any Scheduler received without any context (even for SchedulerImplem)', () => {99      // Arrange100      const act = jest.fn();101      // Act102      const arb = new SchedulerArbitrary(act);103      const out = arb.canShrinkWithoutContext(104        new SchedulerImplemMock.SchedulerImplem(act, { clone: jest.fn(), nextTaskIndex: jest.fn() })105      );106      // Assert107      expect(out).toBe(false);108    });109    it('should return false even for its own values', () => {110      // Arrange111      const act = jest.fn();112      const { instance: mrng, clone } = fakeRandom();113      const { instance: mrng1, clone: clone1 } = fakeRandom();114      const { instance: mrng2 } = fakeRandom();115      clone.mockReturnValueOnce(mrng1);116      clone1.mockReturnValueOnce(mrng2);117      // Act118      const arb = new SchedulerArbitrary(act);119      const g = arb.generate(mrng, undefined);120      const out = arb.canShrinkWithoutContext(g.value);121      // Assert122      expect(out).toBe(false);123    });124  });125  describe('shrink', () => {126    it('should always shrink to nil', () => {127      // Arrange128      const act = jest.fn();129      const { instance: mrng, clone } = fakeRandom();130      const { instance: mrng1, clone: clone1 } = fakeRandom();131      const { instance: mrng2 } = fakeRandom();132      clone.mockReturnValueOnce(mrng1);133      clone1.mockReturnValueOnce(mrng2);134      // Act135      const arb = new SchedulerArbitrary(act);136      const { value, context } = arb.generate(mrng, undefined);137      const shrinks = [...arb.shrink(value, context)];138      // Assert139      expect(shrinks).toHaveLength(0);140    });141  });...

scheduler.spec.ts

Source:scheduler.spec.ts

1import { scheduler, Scheduler, schedulerFor } from '../../../src/arbitrary/scheduler';2import { fakeArbitrary } from './__test-helpers__/ArbitraryHelpers';3import * as BuildSchedulerForMock from '../../../src/arbitrary/_internals/helpers/BuildSchedulerFor';4import * as SchedulerArbitraryMock from '../../../src/arbitrary/_internals/SchedulerArbitrary';5function beforeEachHook() {6  jest.resetModules();7  jest.restoreAllMocks();8}9beforeEach(beforeEachHook);10describe('scheduler', () => {11  it('should instantiate a SchedulerArbitrary with defaulted act (if not provided)', () => {12    // Arrange13    const { instance } = fakeArbitrary<Scheduler<unknown>>();14    const SchedulerArbitrary = jest.spyOn(SchedulerArbitraryMock, 'SchedulerArbitrary');15    SchedulerArbitrary.mockReturnValue(instance as SchedulerArbitraryMock.SchedulerArbitrary<unknown>);16    // Act17    const s = scheduler();18    // Assert19    expect(s).toBe(instance);20    expect(SchedulerArbitrary).toHaveBeenCalledWith(expect.any(Function));21  });22  it('should pass a defaulted act that calls the received function', () => {23    // Arrange24    const { instance } = fakeArbitrary<Scheduler<unknown>>();25    const SchedulerArbitrary = jest.spyOn(SchedulerArbitraryMock, 'SchedulerArbitrary');26    SchedulerArbitrary.mockReturnValue(instance as SchedulerArbitraryMock.SchedulerArbitrary<unknown>);27    const outF = new Promise<unknown>(() => {});28    const f = jest.fn().mockReturnValue(outF);29    // Act30    scheduler();31    const receivedAct = SchedulerArbitrary.mock.calls[0][0];32    const out = receivedAct(f);33    // Assert34    expect(f).toHaveBeenCalledTimes(1);35    expect(out).toBe(outF);36  });37  it('should instantiate a SchedulerArbitrary with received act', () => {38    // Arrange39    const { instance } = fakeArbitrary<Scheduler<unknown>>();40    const SchedulerArbitrary = jest.spyOn(SchedulerArbitraryMock, 'SchedulerArbitrary');41    SchedulerArbitrary.mockReturnValue(instance as SchedulerArbitraryMock.SchedulerArbitrary<unknown>);42    const act = () => Promise.resolve();43    // Act44    const s = scheduler({ act });45    // Assert46    expect(s).toBe(instance);47    expect(SchedulerArbitrary).toHaveBeenCalledWith(act);48  });49});50describe('schedulerFor', () => {51  it('should build proper scheduler when using template string from error logs', async () => {52    // Arrange53    const instance = {} as Scheduler<unknown>;54    const buildSchedulerFor = jest.spyOn(BuildSchedulerForMock, 'buildSchedulerFor');55    buildSchedulerFor.mockReturnValue(instance);56    // Act57    const s = schedulerFor()`58      -> [task${3}] promise rejected with value "pz"59      -> [task${1}] promise resolved with value "px"60      -> [task${2}] promise rejected with value "py"`;61    // Assert62    expect(s).toBe(instance);63    expect(buildSchedulerFor).toHaveBeenCalledWith(expect.any(Function), [3, 1, 2]);64  });65  it('should build proper scheduler when using custom template string', async () => {66    // Arrange67    const instance = {} as Scheduler<unknown>;68    const buildSchedulerFor = jest.spyOn(BuildSchedulerForMock, 'buildSchedulerFor');69    buildSchedulerFor.mockReturnValue(instance);70    // Act71    const s = schedulerFor()`72        This scheduler will resolve task ${2} first73        followed by ${3} and only then task ${1}`;74    // Assert75    expect(s).toBe(instance);76    expect(buildSchedulerFor).toHaveBeenCalledWith(expect.any(Function), [2, 3, 1]);77  });78  it('should build proper scheduler when using ordering array', async () => {79    // Arrange80    const instance = {} as Scheduler<unknown>;81    const buildSchedulerFor = jest.spyOn(BuildSchedulerForMock, 'buildSchedulerFor');82    buildSchedulerFor.mockReturnValue(instance);83    // Act84    const s = schedulerFor([2, 3, 1]);85    // Assert86    expect(s).toBe(instance);87    expect(buildSchedulerFor).toHaveBeenCalledWith(expect.any(Function), [2, 3, 1]);88  });...

scheduler.ts

Source:scheduler.ts

1import { Arbitrary } from '../check/arbitrary/definition/Arbitrary';2import { Scheduler } from './_internals/interfaces/Scheduler';3import { buildSchedulerFor } from './_internals/helpers/BuildSchedulerFor';4import { SchedulerArbitrary } from './_internals/SchedulerArbitrary';5export { Scheduler, SchedulerReportItem, SchedulerSequenceItem } from './_internals/interfaces/Scheduler';6/**7 * Constraints to be applied on {@link scheduler}8 * @remarks Since 2.2.09 * @public10 */11export interface SchedulerConstraints {12  /**13   * Ensure that all scheduled tasks will be executed in the right context (for instance it can be the `act` of React)14   * @remarks Since 1.21.015   */16  act: (f: () => Promise<void>) => Promise<unknown>;17}18/**19 * For scheduler of promises20 * @remarks Since 1.20.021 * @public22 */23export function scheduler<TMetaData = unknown>(constraints?: SchedulerConstraints): Arbitrary<Scheduler<TMetaData>> {24  const { act = (f: () => Promise<void>) => f() } = constraints || {};25  return new SchedulerArbitrary<TMetaData>(act);26}27/**28 * For custom scheduler with predefined resolution order29 *30 * Ordering is defined by using a template string like the one generated in case of failure of a {@link scheduler}31 *32 * It may be something like:33 *34 * @example35 * ```typescript36 * fc.schedulerFor()`37 *   -> [task\${2}] promise pending38 *   -> [task\${3}] promise pending39 *   -> [task\${1}] promise pending40 * `41 * ```42 *43 * Or more generally:44 * ```typescript45 * fc.schedulerFor()`46 *   This scheduler will resolve task ${2} first47 *   followed by ${3} and only then task ${1}48 * `49 * ```50 *51 * WARNING:52 * Custom scheduler will53 * neither check that all the referred promises have been scheduled54 * nor that they resolved with the same status and value.55 *56 *57 * WARNING:58 * If one the promises is wrongly defined it will fail - for instance asking to resolve 5 while 5 does not exist.59 *60 * @remarks Since 1.25.061 * @public62 */63function schedulerFor<TMetaData = unknown>(64  constraints?: SchedulerConstraints65): (_strs: TemplateStringsArray, ...ordering: number[]) => Scheduler<TMetaData>;66/**67 * For custom scheduler with predefined resolution order68 *69 * WARNING:70 * Custom scheduler will not check that all the referred promises have been scheduled.71 *72 *73 * WARNING:74 * If one the promises is wrongly defined it will fail - for instance asking to resolve 5 while 5 does not exist.75 *76 * @param customOrdering - Array defining in which order the promises will be resolved.77 * Id of the promises start at 1. 1 means first scheduled promise, 2 second scheduled promise and so on.78 *79 * @remarks Since 1.25.080 * @public81 */82function schedulerFor<TMetaData = unknown>(83  customOrdering: number[],84  constraints?: SchedulerConstraints85): Scheduler<TMetaData>;86function schedulerFor<TMetaData = unknown>(87  customOrderingOrConstraints: number[] | SchedulerConstraints | undefined,88  constraintsOrUndefined?: SchedulerConstraints89): Scheduler<TMetaData> | ((_strs: TemplateStringsArray, ...ordering: number[]) => Scheduler<TMetaData>) {90  // Extract passed constraints91  const { act = (f: () => Promise<void>) => f() } = Array.isArray(customOrderingOrConstraints)92    ? constraintsOrUndefined || {}93    : customOrderingOrConstraints || {};94  if (Array.isArray(customOrderingOrConstraints)) {95    return buildSchedulerFor(act, customOrderingOrConstraints);96  }97  return function (_strs: TemplateStringsArray, ...ordering: number[]) {98    return buildSchedulerFor(act, ordering);99  };100}...

Using AI Code Generation

1const { SchedulerArbitrary } = require('fast-check/lib/arbitrary/scheduler/SchedulerArbitrary');2const { Scheduler } = require('fast-check/lib/arbitrary/scheduler/Scheduler');3const scheduler = SchedulerArbitrary().generate(mrng(0)).value;4console.log(scheduler);5const scheduler2 = new Scheduler();6console.log(scheduler2);7I have a project that uses fast-check, and I want to use the SchedulerArbitrary() method, but I get the following error:8I have imported the SchedulerArbitrary method as shown above, but it still does not work. I have also tried importing it in the following way:9import { SchedulerArbitrary } from 'fast-check/lib/arbitrary/scheduler/SchedulerArbitrary';10I have also tried importing it in the following way:11import { SchedulerArbitrary } from 'fast-check';12I have also tried importing it in the following way:13import { SchedulerArbitrary } from 'fast-check/lib';14I have also tried importing it in the following way:15import { SchedulerArbitrary } from 'fast-check/lib/arbitrary';16I have also tried importing it in the following way:17import { SchedulerArbitrary } from 'fast-check/lib/arbitrary/scheduler';18I have also tried importing it in the following way:19import { SchedulerArbitrary } from 'fast-check/lib/arbitrary/scheduler/Scheduler';20I have also tried importing it in the following way:21import { SchedulerArbitrary } from 'fast-check/lib/arbitrary/scheduler/SchedulerArbitrary';22I have also tried importing it in the following way:23import { SchedulerArbitrary } from 'fast-check/lib/arbitrary/scheduler/SchedulerArbitrary';24I have also tried importing it in the following way:25import { SchedulerArbitrary } from 'fast-check/lib/arbitrary/scheduler

Using AI Code Generation

1const SchedulerArbitrary = require('fast-check/lib/types/scheduler/SchedulerArbitrary').SchedulerArbitrary;2const Scheduler = require('fast-check/lib/types/scheduler/Scheduler').Scheduler;3const { configureGlobal } = require('fast-check/lib/check/runner/configuration/GlobalParameters').configureGlobal;4const scheduler = SchedulerArbitrary().generate(0).value;5const s = new Scheduler(scheduler);6s.schedule(0, () => console.log('first'));7s.schedule(1, () => console.log('second'));8s.schedule(2, () => console.log('third'));9s.flushUntil(2);10s.flushUntil(3);11configureGlobal({ interruptAfterTimeLimit: 1000 });12s.flushAll();

Using AI Code Generation

1const fc = require("fast-check");2const { SchedulerArbitrary } = require("fast-check/lib/types/arbitrary/SchedulerArbitrary");3const fc = require("fast-check");4const { SchedulerArbitrary } = require("fast-check/lib/types/arbitrary/SchedulerArbitrary");5fc.assert(6    fc.property(SchedulerArbitrary(), (scheduler) => {7    })8);9const { SchedulerArbitrary } = require("fast-check/lib/types/arbitrary/SchedulerArbitrary");10const { Scheduler } = require("fast-check/lib/types/Scheduler");11const scheduler = new Scheduler();12fc.assert(13    fc.property(SchedulerArbitrary(), (s) => {14    })15);16fc.assert(17    fc.property(SchedulerArbitrary(), (s) => {18    })19);20fc.assert(21    fc.property(SchedulerArbitrary(), (s) => {22    })23);24fc.assert(25    fc.property(SchedulerArbitrary(), (s) => {26    })27);28fc.assert(29    fc.property(SchedulerArbitrary(), (s) => {30    })31);32fc.assert(33    fc.property(SchedulerArbitrary(), (s) => {34    })35);36fc.assert(37    fc.property(SchedulerArbitrary(), (s) => {38    })39);40fc.assert(41    fc.property(SchedulerArbitrary(), (s) => {42    })43);44fc.assert(45    fc.property(SchedulerArbitrary(), (s) => {46    })47);48fc.assert(49    fc.property(SchedulerArbitrary(), (s) => {

Using AI Code Generation

1import { SchedulerArbitrary } from 'fast-check/lib/esm/check/arbitrary/SchedulerArbitrary.js';2import { scheduler } from 'fast-check/lib/esm/check/arbitrary/SchedulerArbitrary.js';3import { integer } from 'fast-check/lib/esm/check/arbitrary/IntegerArbitrary.js';4import { tuple } from 'fast-check/lib/esm/check/arbitrary/TupleArbitrary.js';5import { constantFrom } from 'fast-check/lib/esm/check/arbitrary/ConstantArbitrary.js';6import { stringOf } from 'fast-check/lib/esm/check/arbitrary/StringArbitrary.js';7import { array } from 'fast-check/lib/esm/check/arbitrary/ArrayArbitrary.js';8import { oneof } from 'fast-check/lib/esm/check/arbitrary/OneOfArbitrary.js';9import { record } from 'fast-check/lib/esm/check/arbitrary/RecordArbitrary.js';10import { set } from 'fast-check/lib/esm/check/arbitrary/SetArbitrary.js';11import { dictionary } from 'fast-check/lib/esm/check/arbitrary/DictionaryArbitrary.js';12import { option } from 'fast-check/lib/esm/check/arbitrary/OptionArbitrary.js';13import { anything } from 'fast-check/lib/esm/check/arbitrary/AnythingArbitrary.js';14import { cloneMethod } from 'fast-check/lib/esm/check/symbols.js';15import { cloneMethod as cloneMethod$1 } from 'fast-check/lib/esm/check/symbols.js';16import { cloneMethod as cloneMethod$2 } from 'fast-check/lib/esm/check/symbols.js';17import { cloneMethod as cloneMethod$3 } from 'fast-check/lib/esm/check/symbols.js';18import { cloneMethod as cloneMethod$4 } from 'fast-check/lib/esm/check/symbols.js';19import { cloneMethod as cloneMethod$5 } from 'fast-check/lib/esm/check/symbols.js';20import { cloneMethod as cloneMethod$6 } from 'fast-check/lib/esm/check/symbols.js';21import { cloneMethod as cloneMethod$7 } from 'fast-check/lib/esm/check/symbols.js';22import { cloneMethod as cloneMethod$8 } from 'fast-check/lib/esm/check/symbols.js';23import { cloneMethod as cloneMethod$9 } from 'fast-check/lib/esm/check/symbols.js';24import { cloneMethod as cloneMethod$10 } from 'fast-check/lib/esm/check/s

Using AI Code Generation

1const { SchedulerArbitrary } = require("fast-check");2const { Scheduler } = require("fast-check/lib/types/scheduler/Scheduler");3const { scheduler } = require("fast-check/lib/types/scheduler/Scheduler");4const { schedulerWithTime } = require("fast-check/lib/types/scheduler/SchedulerWithTime");5const { schedulerWithTimeAndCounters } = require("fast-check/lib/types/scheduler/SchedulerWithTimeAndCounters");6const { schedulerWithTimeAndCountersAndHooks } = require("fast-check/lib/types/scheduler/SchedulerWithTimeAndCountersAndHooks");7const { schedulerWithTimeAndCountersAndHooksAndClock } = require("fast-check/lib/types/scheduler/SchedulerWithTimeAndCountersAndHooksAndClock");8const { schedulerWithTimeAndCountersAndHooksAndClockAndState } = require("fast-check/lib/types/scheduler/SchedulerWithTimeAndCountersAndHooksAndClockAndState");9const { schedulerWithTimeAndCountersAndHooksAndClockAndStateAndRandom } = require("fast-check/lib/types/scheduler/SchedulerWithTimeAndCountersAndHooksAndClockAndStateAndRandom");10const { schedulerWithTimeAndCountersAndHooksAndClockAndStateAndRandomAndConstraints } = require("fast-check/lib/types/scheduler/SchedulerWithTimeAndCountersAndHooksAndClockAndStateAndRandomAndConstraints");11const { schedulerWithTimeAndCountersAndHooksAndClockAndStateAndRandomAndConstraintsAndRecorded } = require("fast-check/lib/types/scheduler/SchedulerWithTimeAndCountersAndHooksAndClockAndStateAndRandomAndConstraintsAndRecorded");12const { schedulerWithTimeAndCountersAndHooksAndClockAndStateAndRandomAndConstraintsAndRecordedAndTime } = require("fast-check/lib/types/scheduler/SchedulerWithTimeAndCountersAndHooksAndClockAndStateAndRandomAndConstraintsAndRecordedAndTime");13const { schedulerWithTimeAndCountersAndHooksAndClockAndStateAndRandomAndConstraintsAndRecordedAndTimeAndState } = require("fast-check/lib/types/scheduler/SchedulerWithTimeAndCountersAndHooksAndClockAndStateAndRandomAndConstraintsAndRecordedAndTimeAndState");14const { schedulerWithTimeAndCountersAndHooksAndClockAndStateAndRandomAndConstraintsAndRecordedAndTimeAndStateAndRandom } = require("fast-check/lib/types/scheduler/SchedulerWithTimeAndCountersAndHooksAndClockAndState

Using AI Code Generation

1const SchedulerArbitrary = require('fast-check/lib/arbitrary/SchedulerArbitrary.js');2const fc = require('fast-check');3const { it } = require('mocha');4it('should run', () => {5    fc.assert(6        fc.property(SchedulerArbitrary(), (scheduler) => {7            return true;8        })9    );10});11{12  "scripts": {13  },14  "dependencies": {15  },16  "devDependencies": {17  }18}19const { SchedulerArbitrary } = require('fast-check/lib/arbitrary/SchedulerArbitrary.js');20const fc = require('fast-check');21const { it } = require('mocha');22it('should run', () => {23    fc.assert(24        fc.property(SchedulerArbitrary(), (scheduler) => {25            return true;26        })27    );28});29{30  "scripts": {31  },32  "dependencies": {33  },34  "devDependencies": {35  }36}

Using AI Code Generation

1import { SchedulerArbitrary } from 'fast-check';2const scheduler = SchedulerArbitrary().generate();3scheduler.schedule(() => console.log('hello world'));4{5  "dependencies": {6  }7}

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.