How to use fakeStringify method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

StreamArbitrary.spec.ts

Source:StreamArbitrary.spec.ts

1import * as fc from 'fast-check';2import { StreamArbitrary } from '../../../../src/arbitrary/_internals/StreamArbitrary';3import { Value } from '../../../../src/check/arbitrary/definition/Value';4import { cloneIfNeeded, hasCloneMethod } from '../../../../src/check/symbols';5import { Stream } from '../../../../src/stream/Stream';6import {7  assertProduceCorrectValues,8  assertProduceSameValueGivenSameSeed,9} from '../__test-helpers__/ArbitraryAssertions';10import { FakeIntegerArbitrary, fakeArbitrary } from '../__test-helpers__/ArbitraryHelpers';11import { fakeRandom } from '../__test-helpers__/RandomHelpers';12import * as StringifyMock from '../../../../src/utils/stringify';13function beforeEachHook() {14  jest.resetModules();15  jest.restoreAllMocks();16  fc.configureGlobal({ beforeEach: beforeEachHook });17}18beforeEach(beforeEachHook);19describe('StreamArbitrary', () => {20  describe('generate', () => {21    it('should produce a cloneable instance of Stream', () => {22      // Arrange23      const biasFactor = 48;24      const { instance: sourceArb } = fakeArbitrary();25      const { instance: mrng } = fakeRandom();26      // Act27      const arb = new StreamArbitrary(sourceArb);28      const out = arb.generate(mrng, biasFactor);29      // Assert30      expect(out.value).toBeInstanceOf(Stream);31      expect(out.hasToBeCloned).toBe(true);32      expect(hasCloneMethod(out.value)).toBe(true);33    });34    it('should not call generate before we pull from the Stream but decide bias', () => {35      // Arrange36      const biasFactor = 48;37      const { instance: sourceArb, generate } = fakeArbitrary();38      const { instance: mrng, nextInt } = fakeRandom();39      // Act40      const arb = new StreamArbitrary(sourceArb);41      arb.generate(mrng, biasFactor).value;42      // Assert43      expect(nextInt).toHaveBeenCalledTimes(1);44      expect(nextInt).toHaveBeenCalledWith(1, biasFactor);45      expect(generate).not.toHaveBeenCalled();46    });47    it('should not check bias again for cloned instances', () => {48      // Arrange49      const biasFactor = 48;50      const { instance: sourceArb } = fakeArbitrary();51      const { instance: mrng, nextInt } = fakeRandom();52      // Act53      const arb = new StreamArbitrary(sourceArb);54      const out = arb.generate(mrng, biasFactor);55      const s1 = out.value;56      const s2 = out.value;57      // Assert58      expect(nextInt).toHaveBeenCalledTimes(1);59      expect(nextInt).toHaveBeenCalledWith(1, biasFactor);60      expect(s2).not.toBe(s1);61    });62    it('should call generate with cloned instance of Random as we pull from the Stream', () => {63      // Arrange64      const numValuesToPull = 5;65      const biasFactor = 48;66      let index = 0;67      const expectedValues = [...Array(numValuesToPull)].map(() => Symbol());68      const { instance: sourceArb, generate } = fakeArbitrary();69      generate.mockImplementation(() => new Value(expectedValues[index++], undefined));70      const { instance: mrng, clone, nextInt } = fakeRandom();71      nextInt.mockReturnValueOnce(1); // for bias72      const { instance: mrngCloned } = fakeRandom();73      clone.mockReturnValueOnce(mrngCloned);74      // Act75      const arb = new StreamArbitrary(sourceArb);76      const stream = arb.generate(mrng, biasFactor).value;77      const values = [...stream.take(numValuesToPull)];78      // Assert79      expect(generate).toHaveBeenCalledTimes(numValuesToPull);80      for (const call of generate.mock.calls) {81        expect(call).toEqual([mrngCloned, biasFactor]);82      }83      expect(values).toEqual(expectedValues);84    });85    it('should call generate with cloned instance of Random specific for each Stream', () => {86      // Arrange87      const numValuesToPullS1 = 5;88      const numValuesToPullS2 = 3;89      const biasFactor = 48;90      const { instance: sourceArb, generate } = fakeArbitrary();91      generate.mockImplementation(() => new Value(Symbol(), undefined));92      const { instance: mrng, clone, nextInt } = fakeRandom();93      nextInt.mockReturnValueOnce(1); // for bias94      const { instance: mrngClonedA } = fakeRandom();95      const { instance: mrngClonedB } = fakeRandom();96      clone.mockReturnValueOnce(mrngClonedA).mockReturnValueOnce(mrngClonedB);97      // Act98      const arb = new StreamArbitrary(sourceArb);99      const out = arb.generate(mrng, biasFactor);100      const s1 = out.value;101      const c1 = s1[Symbol.iterator]();102      for (let i = 0; i !== numValuesToPullS1; ++i) {103        const next = c1.next();104        expect(next.done).toBe(false);105      }106      const s2 = out.value;107      const c2 = s2[Symbol.iterator]();108      for (let i = 0; i !== numValuesToPullS2; ++i) {109        const next = c2.next();110        expect(next.done).toBe(false);111      }112      c1.next();113      // Assert114      expect(generate).toHaveBeenCalledTimes(numValuesToPullS1 + numValuesToPullS2 + 1);115      const calls = generate.mock.calls;116      for (let i = 0; i !== numValuesToPullS1; ++i) {117        const call = calls[i];118        expect(call).toEqual([mrngClonedA, biasFactor]);119      }120      for (let i = 0; i !== numValuesToPullS2; ++i) {121        const call = calls[numValuesToPullS1 + i];122        expect(call).toEqual([mrngClonedB, biasFactor]);123      }124      expect(calls[numValuesToPullS1 + numValuesToPullS2]).toEqual([mrngClonedA, biasFactor]);125    });126    it('should only print pulled values on print', () =>127      fc.assert(128        fc.property(fc.array(fc.integer()), (expectedValues) => {129          // Arrange130          const biasFactor = 48;131          let index = 0;132          const { instance: sourceArb, generate } = fakeArbitrary<number>();133          generate.mockImplementation(() => new Value(expectedValues[index++], undefined));134          const { instance: mrng, clone, nextInt } = fakeRandom();135          nextInt.mockReturnValueOnce(2); // for no bias136          const { instance: mrngCloned } = fakeRandom();137          clone.mockReturnValueOnce(mrngCloned);138          const fakeStringify = (v: unknown) => '<' + String(v) + '>';139          const stringify = jest.spyOn(StringifyMock, 'stringify');140          stringify.mockImplementation(fakeStringify);141          // Act142          const arb = new StreamArbitrary(sourceArb);143          const stream = arb.generate(mrng, biasFactor).value;144          const values = [...stream.take(expectedValues.length)];145          // Assert146          expect(values).toEqual(expectedValues);147          expect(String(stream)).toEqual(`Stream(${expectedValues.map(fakeStringify).join(',')}â¦)`);148          expect(stringify).toHaveBeenCalledTimes(expectedValues.length);149          expect(generate).toHaveBeenCalledTimes(expectedValues.length);150          if (expectedValues.length > 0) {151            expect(generate).toHaveBeenCalledWith(mrngCloned, undefined);152          }153        })154      ));155    it('should create independant Stream even in terms of toString', () => {156      // Arrange157      const biasFactor = 48;158      let index = 0;159      const { instance: sourceArb, generate } = fakeArbitrary<number>();160      generate.mockImplementation(() => new Value(index++, undefined));161      const { instance: mrng, clone, nextInt } = fakeRandom();162      nextInt.mockReturnValueOnce(2); // for no bias163      const { instance: mrngCloned } = fakeRandom();164      clone.mockReturnValueOnce(mrngCloned);165      const stringify = jest.spyOn(StringifyMock, 'stringify');166      stringify.mockImplementation((v) => '<' + String(v) + '>');167      // Act168      const arb = new StreamArbitrary(sourceArb);169      const out = arb.generate(mrng, biasFactor);170      const stream1 = out.value;171      const stream2 = out.value;172      const values1 = [...stream1.take(2)];173      const values2 = [...stream2.take(3)];174      const values1Bis = [...stream1.take(2)];175      // Assert176      expect(values1).toEqual([0, 1]);177      expect(values2).toEqual([2, 3, 4]);178      expect(values1Bis).toEqual([5, 6]);179      expect(String(stream1)).toEqual(`Stream(<0>,<1>,<5>,<6>â¦)`);180      expect(String(stream2)).toEqual(`Stream(<2>,<3>,<4>â¦)`);181      expect(stringify).toHaveBeenCalledTimes(7);182      expect(generate).toHaveBeenCalledTimes(7);183    });184  });185  describe('canShrinkWithoutContext', () => {186    function* infiniteG() {187      yield 1;188    }189    it.each`190      data                         | description191      ${Stream.nil()}              | ${'empty stream'}192      ${Stream.of(1, 5, 6, 74, 4)} | ${'finite stream'}193      ${new Stream(infiniteG())}   | ${'infinite stream'}194    `('should return false for any Stream whatever the size ($description)', ({ data }) => {195      // Arrange196      const { instance: sourceArb, canShrinkWithoutContext } = fakeArbitrary();197      // Act198      const arb = new StreamArbitrary(sourceArb);199      const out = arb.canShrinkWithoutContext(data);200      // Assert201      expect(out).toBe(false);202      expect(canShrinkWithoutContext).not.toHaveBeenCalled();203    });204    it('should return false even for its own values', () => {205      // Arrange206      const { instance: sourceArb, canShrinkWithoutContext } = fakeArbitrary();207      const { instance: mrng } = fakeRandom();208      // Act209      const arb = new StreamArbitrary(sourceArb);210      const g = arb.generate(mrng, undefined);211      const out = arb.canShrinkWithoutContext(g.value);212      // Assert213      expect(out).toBe(false);214      expect(canShrinkWithoutContext).not.toHaveBeenCalled();215    });216  });217  describe('shrink', () => {218    it('should always shrink to nil', () => {219      // Arrange220      const { instance: sourceArb, generate, shrink } = fakeArbitrary<number>();221      generate.mockReturnValue(new Value(0, undefined));222      const { instance: mrng } = fakeRandom();223      // Act224      const arb = new StreamArbitrary(sourceArb);225      const { value, context } = arb.generate(mrng, undefined);226      const pullValues = [...value.take(50)];227      const shrinks = [...arb.shrink(value, context)];228      // Assert229      expect(pullValues).toBeDefined();230      expect(shrinks).toHaveLength(0);231      expect(shrink).not.toHaveBeenCalled();232    });233  });234});235describe('StreamArbitrary (integration)', () => {236  const sourceArb = new FakeIntegerArbitrary();237  const isEqual = (s1: Stream<number>, s2: Stream<number>) => {238    expect([...cloneIfNeeded(s1).take(10)]).toEqual([...cloneIfNeeded(s2).take(10)]);239  };240  const isCorrect = (value: Stream<number>) =>241    value instanceof Stream && [...value.take(10)].every((v) => sourceArb.canShrinkWithoutContext(v));242  const streamBuilder = () => new StreamArbitrary(sourceArb);243  it('should produce the same values given the same seed', () => {244    assertProduceSameValueGivenSameSeed(streamBuilder, { isEqual });245  });246  it('should only produce correct values', () => {247    assertProduceCorrectValues(streamBuilder, isCorrect);248  });...

Using AI Code Generation

1const { fakeStringify } = require('fast-check');2const { stringify } = require('fast-json-stringify');3const schema = {4  properties: {5    hello: { type: 'string' },6  },7};8const stringifySchema = stringify(schema);9const result = fakeStringify(stringifySchema);10console.log(result);11{12  "dependencies": {13  }14}15{16}

Using AI Code Generation

1const { fakeStringify } = require('fast-check-monorepo');2const result = fakeStringify({ a: 1, b: 2 });3console.log(result);4{5  "scripts": {6  },7  "dependencies": {8  }9}

Using AI Code Generation

1import { fakeStringify } from 'fast-check-monorepo'2console.log(fakeStringify({hello: 'world'}))3import { fakeStringify } from 'fast-check-monorepo'4console.log(fakeStringify({hello: 'world'}))5import { fakeStringify } from 'fast-check-monorepo'6console.log(fakeStringify({hello: 'world'}))7import { fakeStringify } from 'fast-check-monorepo'8console.log(fakeStringify({hello: 'world'}))9import { fakeStringify } from 'fast-check-monorepo'10console.log(fakeStringify({hello: 'world'}))11import { fakeStringify } from 'fast-check-monorepo'12console.log(fakeStringify({hello: 'world'}))13import { fakeStringify } from 'fast-check-monorepo'14console.log(fakeStringify({hello: 'world'}))15import { fakeStringify } from 'fast-check-monorepo'16console.log(fakeStringify({hello: 'world'}))17import { fakeStringify } from 'fast-check-monorepo'18console.log(fakeStringify({hello: 'world'}))19import { fakeStringify } from 'fast-check-monorepo'20console.log(fakeStringify({hello: 'world'}))

Using AI Code Generation

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

Using AI Code Generation

1const fc = require('fast-check');2const fakeStringify = require('fast-check-monorepo').fakeStringify;3const arb = fc.array(fc.nat());4const fakeString = fakeStringify(arb);5console.log(fakeString);6{7  "scripts": {8  },9  "dependencies": {10  }11}

Using AI Code Generation

1const fastCheck = require('@dubzzz/fast-check');2const fakeStringify = fastCheck.FakeJsonStringify;3const obj = { a: 1, b: 2 };4const str = fakeStringify(obj);5const fastCheck = require('fast-check');6const fakeStringify = fastCheck.FakeJsonStringify;7const obj = { a: 1, b: 2 };8const str = fakeStringify(obj);9const fastCheck = require('@dubzzz/fast-check');10const fakeStringify = fastCheck.FakeJsonStringify;11const obj = { a: 1, b: 2 };12const str = fakeStringify(obj);13const fastCheck = require('fast-check');14const fakeStringify = fastCheck.FakeJsonStringify;15const obj = { a: 1, b: 2 };16const str = fakeStringify(obj);17const fastCheck = require('@dubzzz/fast-check');18const fakeStringify = fastCheck.FakeJsonStringify;19const obj = { a: 1, b: 2 };20const str = fakeStringify(obj);21const fastCheck = require('fast-check');22const fakeStringify = fastCheck.FakeJsonStringify;23const obj = { a: 1, b: 2 };24const str = fakeStringify(obj);25const fastCheck = require('@dubzzz/fast-check');

Using AI Code Generation

1const fc = require('fast-check');2const { fakeStringify } = require('@rpldy/shared');3fc.assert(4    fc.property(fc.anything(), (a) => {5        const res = fakeStringify(a);6        return true;7    })8);9{10    "dependencies": {11    }12}13    at Function.fastCheck (node_modules/fast-check/lib/fast-check-default.js:8:40)14    at Object.<anonymous> (test.js:3:11)15    at Module._compile (internal/modules/cjs/loader.js:1158:30)16    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1178:10)17    at Module.load (internal/modules/cjs/loader.js:1002:32)18    at Function.Module._load (internal/modules/cjs/loader.js:901:14)19    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12)

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.