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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)

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