How to use shrinkTreeB method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

Arbitrary.itest.spec.ts

Source:Arbitrary.itest.spec.ts Github

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1import { Arbitrary } from '../../../../../src/check/arbitrary/definition/Arbitrary';2import { Value } from '../../../../../src/check/arbitrary/definition/Value';3import { cloneMethod, hasCloneMethod } from '../../../../../src/check/symbols';4import { Random } from '../../../../../src/random/generator/Random';5import { Stream } from '../../../../../src/stream/Stream';6import * as stubRng from '../../../stubs/generators';7import { buildShrinkTree, renderTree, walkTree } from '../../../arbitrary/__test-helpers__/ShrinkTree';8const mrngNoCall = stubRng.mutable.nocall();9describe('Arbitrary', () => {10 describe('map', () => {11 it('should produce the right shrinking tree', () => {12 // Arrange13 class MyArbitrary extends Arbitrary<number> {14 generate(_mrng: Random): Value<number> {15 return new Value(10, { step: 2 });16 }17 canShrinkWithoutContext(value: unknown): value is number {18 throw new Error('No call expected in current scenario');19 }20 shrink(value: number, context?: unknown): Stream<Value<number>> {21 if (typeof context !== 'object' || context === null || !('step' in context)) {22 throw new Error('Invalid context for MyArbitrary');23 }24 const currentStep = (context as { step: number }).step;25 const nextStep = currentStep + 1;26 return Stream.of(27 ...(value - currentStep >= 0 ? [new Value(value - currentStep, { step: nextStep })] : []),28 ...(value - 1 >= 0 ? [new Value(value - 1, { step: nextStep })] : [])29 );30 }31 }32 const arb = new MyArbitrary().map((n) => String(n));33 // Act34 const g = arb.generate(mrngNoCall, undefined);35 const renderedTree = renderTree(buildShrinkTree(arb, g)).join('\n');36 // Assert37 expect(renderedTree).toMatchInlineSnapshot(`38 ""10"39 ├> "8"40 | ├> "5"41 | | ├> "1"42 | | | └> "0"43 | | └> "4"44 | | └> "3"45 | | └> "2"46 | | └> "1"47 | | └> "0"48 | └> "7"49 | ├> "3"50 | | └> "2"51 | | └> "1"52 | | └> "0"53 | └> "6"54 | ├> "1"55 | | └> "0"56 | └> "5"57 | └> "4"58 | └> "3"59 | └> "2"60 | └> "1"61 | └> "0"62 └> "9"63 ├> "6"64 | ├> "2"65 | | └> "1"66 | | └> "0"67 | └> "5"68 | ├> "0"69 | └> "4"70 | └> "3"71 | └> "2"72 | └> "1"73 | └> "0"74 └> "8"75 ├> "4"76 | └> "3"77 | └> "2"78 | └> "1"79 | └> "0"80 └> "7"81 ├> "2"82 | └> "1"83 | └> "0"84 └> "6"85 ├> "0"86 └> "5"87 └> "4"88 └> "3"89 └> "2"90 └> "1"91 └> "0""92 `);93 });94 it('should preserve cloneable capabilities during both generation and shrinking process', () => {95 // Arrange96 type MyArbitraryOutput = { value: number };97 class MyArbitrary extends Arbitrary<MyArbitraryOutput> {98 private create(value: number): MyArbitraryOutput {99 const complexInstance = { value, [cloneMethod]: () => this.create(value) };100 return complexInstance;101 }102 generate(_mrng: Random): Value<MyArbitraryOutput> {103 return new Value(this.create(10), undefined);104 }105 canShrinkWithoutContext(value: unknown): value is MyArbitraryOutput {106 throw new Error('No call expected in current scenario');107 }108 shrink(v: MyArbitraryOutput, _context?: unknown): Stream<Value<MyArbitraryOutput>> {109 const value = v.value;110 return Stream.of(111 ...(value - 2 >= 0 ? [new Value(this.create(value - 2), undefined)] : []),112 ...(value - 1 >= 0 ? [new Value(this.create(value - 1), undefined)] : [])113 );114 }115 }116 const seenInstances = new Set<unknown>();117 const arb = new MyArbitrary().map((out) => ({ stringValue: String(out.value), counter: 0 }));118 // Act119 const g = arb.generate(mrngNoCall, undefined);120 const shrinkTree = buildShrinkTree(arb, g);121 const shrinkTreeB = buildShrinkTree(arb, g);122 // Assert123 const visit = (instance: { counter: number }) => {124 expect(hasCloneMethod(instance)).toBe(true); // clone method should be provided125 expect(instance.counter).toBe(0); // counter should be unique per cloned instance126 expect(seenInstances.has(instance)).toBe(false); // each instance must appear only once in the tree127 instance.counter += 1;128 seenInstances.add(instance);129 };130 walkTree(shrinkTree, visit);131 walkTree(shrinkTreeB, visit);132 });133 it('should preserve cloneable capabilities during both generation and shrinking process even if output of map is already cloneable', () => {134 // Arrange135 type MyArbitraryOutput = { value: number; counter: number };136 class MyArbitrary extends Arbitrary<MyArbitraryOutput> {137 private create(value: number): MyArbitraryOutput {138 const complexInstance = { value, counter: 0, [cloneMethod]: () => this.create(value) };139 return complexInstance;140 }141 generate(_mrng: Random): Value<MyArbitraryOutput> {142 return new Value(this.create(10), undefined);143 }144 canShrinkWithoutContext(value: unknown): value is MyArbitraryOutput {145 throw new Error('No call expected in current scenario');146 }147 shrink(v: MyArbitraryOutput, _context?: unknown): Stream<Value<MyArbitraryOutput>> {148 const value = v.value;149 return Stream.of(150 ...(value - 2 >= 0 ? [new Value(this.create(value - 2), undefined)] : []),151 ...(value - 1 >= 0 ? [new Value(this.create(value - 1), undefined)] : [])152 );153 }154 }155 const seenInstances = new Set<unknown>();156 const arb = new MyArbitrary().map((out) => out); // out is already cloneable157 // Act158 const g = arb.generate(mrngNoCall, undefined);159 const shrinkTree = buildShrinkTree(arb, g);160 const shrinkTreeB = buildShrinkTree(arb, g);161 // Assert162 const visit = (instance: { counter: number }) => {163 expect(hasCloneMethod(instance)).toBe(true); // clone method should be provided164 expect(instance.counter).toBe(0); // counter should be unique per cloned instance165 expect(seenInstances.has(instance)).toBe(false); // each instance must appear only once in the tree166 instance.counter += 1;167 seenInstances.add(instance);168 };169 walkTree(shrinkTree, visit);170 walkTree(shrinkTreeB, visit);171 });172 });173 describe('chain', () => {174 it('should produce the right shrinking tree', () => {175 // Arrange176 class MyArbitrary extends Arbitrary<number> {177 generate(_mrng: Random): Value<number> {178 return new Value(5, { step: 2 });179 }180 canShrinkWithoutContext(value: unknown): value is number {181 throw new Error('No call expected in current scenario');182 }183 shrink(value: number, context?: unknown): Stream<Value<number>> {184 if (typeof context !== 'object' || context === null || !('step' in context)) {185 throw new Error('Invalid context for MyArbitrary');186 }187 const currentStep = (context as { step: number }).step;188 if (value - currentStep < 0) {189 return Stream.nil();190 }191 const nextStep = currentStep + 1;192 return Stream.of(new Value(value - currentStep, { step: nextStep }));193 }194 }195 class MyChainedArbitrary extends Arbitrary<number[]> {196 constructor(readonly size: number, readonly value: number) {197 super();198 }199 generate(_mrng: Random): Value<number[]> {200 return new Value(Array(this.size).fill(this.value), {201 size: this.size,202 value: this.value,203 });204 }205 canShrinkWithoutContext(value: unknown): value is number[] {206 throw new Error('No call expected in current scenario');207 }208 shrink(value: number[], context?: unknown): Stream<Value<number[]>> {209 if (typeof context !== 'object' || context === null || !('size' in context) || !('value' in context)) {210 throw new Error('Invalid context for MyChainedArbitrary');211 }212 const currentContext = context as { size: number; value: number };213 if (currentContext.size === 0) {214 return Stream.nil();215 }216 return Stream.of(217 ...(currentContext.value === value[0]218 ? [new Value(Array(currentContext.size).fill(0), currentContext)]219 : []),220 ...(value.length > 1 ? [new Value([value[0]], currentContext)] : [])221 );222 }223 }224 const arb = new MyArbitrary().chain((n) => new MyChainedArbitrary(n, n));225 // Act226 const g = arb.generate(mrngNoCall, undefined);227 const renderedTree = renderTree(buildShrinkTree(arb, g)).join('\n');228 // Assert229 expect(renderedTree).toMatchInlineSnapshot(`230 "[5,5,5,5,5]231 ├> [3,3,3]232 | ├> []233 | ├> [0,0,0]234 | | └> [0]235 | └> [3]236 | └> [0,0,0]237 | └> [0]238 ├> [0,0,0,0,0]239 | └> [0]240 └> [5]241 └> [0,0,0,0,0]242 └> [0]"243 `);244 });245 });246 describe('filter', () => {247 it('should produce the right shrinking tree', () => {248 // Arrange249 class MyArbitrary extends Arbitrary<number> {250 generate(_mrng: Random): Value<number> {251 return new Value(10, { step: 3 });252 }253 canShrinkWithoutContext(value: unknown): value is number {254 throw new Error('No call expected in current scenario');255 }256 shrink(value: number, context?: unknown): Stream<Value<number>> {257 if (typeof context !== 'object' || context === null || !('step' in context)) {258 throw new Error('Invalid context for MyArbitrary');259 }260 const currentStep = (context as { step: number }).step;261 const nextStep = currentStep + 1;262 return Stream.of(263 ...(value - currentStep >= 0 ? [new Value(value - currentStep, { step: nextStep })] : []),264 ...(value - 2 >= 0 ? [new Value(value - 2, { step: nextStep })] : []),265 ...(value - 1 >= 0 ? [new Value(value - 1, { step: nextStep })] : [])266 );267 }268 }269 const arb = new MyArbitrary().filter((n) => n % 2 === 0);270 // Act271 const g = arb.generate(mrngNoCall, undefined);272 const renderedTree = renderTree(buildShrinkTree(arb, g)).join('\n');273 // Assert274 expect(renderedTree).toMatchInlineSnapshot(`275 "10276 └> 8277 ├> 4278 | └> 2279 | └> 0280 └> 6281 └> 4282 └> 2283 └> 0"284 `);285 });286 });...

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Using AI Code Generation

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1const shrinkTreeB = require('fast-check-monorepo').shrinkTreeB;2const shrinkTreeB = require('fast-check').shrinkTreeB;3const shrinkTreeB = require('fast-check-monorepo').shrinkTreeB;4const shrinkTreeB = require('fast-check').shrinkTreeB;5const shrinkTreeB = require('fast-check-monorepo').shrinkTreeB;6const shrinkTreeB = require('fast-check').shrinkTreeB;7const shrinkTreeB = require('fast-check-monorepo').shrinkTreeB;8const shrinkTreeB = require('fast-check').shrinkTreeB;9const shrinkTreeB = require('fast-check-monorepo').shrinkTreeB;10const shrinkTreeB = require('fast-check').shrinkTreeB;11const shrinkTreeB = require('fast-check-monorepo').shrinkTreeB;12const shrinkTreeB = require('fast-check').shrinkTreeB;13const shrinkTreeB = require('fast-check-monorepo').shrinkTreeB;14const shrinkTreeB = require('fast-check').shrinkTreeB;15const shrinkTreeB = require('fast-check-monorepo').shrinkTreeB;16const shrinkTreeB = require('fast-check').shrinkTreeB;17const shrinkTreeB = require('fast-check-monorepo').shrinkTreeB;

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Using AI Code Generation

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1const { shrinkTreeB } = require('fast-check-monorepo')2const { shrinkTreeB } = require('fast-check')3const { shrinkTreeB } = require('fast-check-monorepo')4const { shrinkTreeB } = require('fast-check')5I am using the following code to import the shrinkTreeB method from fast-check-monorepo and fast-check6const { shrinkTreeB } = require('fast-check-monorepo')7const { shrinkTreeB } = require('fast-check')8const { shrinkTreeB } = require('fast-check-monorepo')9const { shrinkTreeB } = require('fast-check')10I am using the following code to import the shrinkTreeB method from fast-check-monorepo and fast-check11const { shrinkTreeB } = require('fast-check-monorepo')12const { shrinkTreeB } = require('fast-check')13const { shrinkTreeB } = require('fast-check-monorepo')14const { shrinkTreeB } = require('fast-check')15I am using the following code to import the shrinkTreeB method from fast-check-monorepo and fast-check16const { shrinkTreeB } = require('fast-check-monorepo')17const { shrinkTreeB } = require('fast-check')18const { shrinkTreeB } = require('fast-check-monorepo')19const { shrinkTreeB } = require('fast-check')20I am using the following code to import the shrinkTreeB method from fast-check-monorepo and fast-check21const { shrinkTreeB } = require('fast-check-monorepo')22const { shrinkTreeB } = require('fast-check')23const { shrinkTreeB } = require('fast-check-monorepo')24const { shrinkTreeB } = require('fast-check')25I am using the following code to import the shrinkTreeB method from fast-check-monorepo and fast-check26const { shrinkTreeB } = require('fast-check-monorepo')27const { shrinkTreeB } = require('fast-check')28const { shrinkTreeB } = require('fast-check-monorepo')29const { shrinkTreeB } = require('fast-check')30I am using the following code to import the shrinkTreeB method from

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Using AI Code Generation

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

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Using AI Code Generation

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1const {shrinkTreeB} = require('fast-check-monorepo');2const {shrinkTree} = require('fast-check');3const {shrinkTree} = require('fast-check');4const tree = {value: 1, children: [{value: 2, children: []}]};5const shrunkTree = shrinkTreeB(tree, (t) => t.value);6console.log(shrunkTree);7const {shrinkTreeB} = require('fast-check-monorepo');8const {shrinkTree} = require('fast-check');9const {shrinkTree} = require('fast-check');10const tree = {value: 1, children: [{value: 2, children: []}]};11const shrunkTree = shrinkTreeB(tree, (t) => t.value);12console.log(shrunkTree);

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Using AI Code Generation

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1const { shrinkTreeB } = require('fast-check-monorepo');2const { shrinkTree } = require('fast-check');3const initialArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];4const shrinkArray = shrinkTreeB(shrinkTree, initialArray);5for (const shrinkedArray of shrinkArray) {6 console.log(shrinkedArray);7}8const { shrinkTreeB } = require('fast-check');9const { shrinkTree } = require('fast-check');10const initialArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];11const shrinkArray = shrinkTreeB(shrinkTree, initialArray);12for (const shrinkedArray of shrinkArray) {13 console.log(shrinkedArray);14}

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Using AI Code Generation

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1const fc = require('fast-check');2const { shrinkTreeB } = require('fast-check-monorepo');3const shrinkTree = shrinkTreeB(fc);4test('sample test', () => {5 fc.assert(6 fc.property(fc.array(fc.integer()), (arr) => {7 const shrunk = shrinkTree(arr);8 const shrunkArr = [...shrunk];9 return expect(shrunkArr).toEqual([]);10 })11 );12});13test('test with error', () => {14 fc.assert(15 fc.property(fc.array(fc.integer()), (arr) => {16 const shrunk = shrinkTree(arr);17 const shrunkArr = [...shrunk];18 return expect(shrunkArr).toEqual([[]]);19 })20 );21});22test('test with error', () => {23 fc.assert(24 fc.property(fc.array(fc.integer()), (arr) => {25 const shrunk = shrinkTree(arr);26 const shrunkArr = [...shrunk];27 return expect(shrunkArr).toEqual([[]]);28 })29 );30});31Thanks for the report. I am not sure that I understand the issue. Could you please provide a minimal reproducible example (e.g. a github repository)?

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