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How to use shrinkBigInt method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

language.ts

Source:language.ts

1import util from 'util';2import { merge } from 'merge-anything';3import { isPlainObject } from 'is-what';4import { iterator, AnyIterable, AnyIterator } from './iterable';5import {6    LanguageReprs,7    LanguageFormat,8    LanguageConsts,9    LanguageDefinition,10    ReprAllTypes,11    ReprContainerType,12    ReprType,13    ReprFunction,14    ReprReturn,15    ReprIterableFunction,16    StackInterface,17    Shrink,18    LanguageInterface19} from './language-types';20export { LanguageDefinition };21const isDate = util.types.isDate;22export const REPR: symbol = Symbol('repr');23const reprObject = async function*(24    object: { [key: string]: any },25    lang: LanguageInterface,26    stack: StackInterface27) {28    if (!lang.format.object) {29        return;30    }31    const format = lang.format.object;32    const formatKey = format.key;33    lang.unsupported(formatKey, `[key] of objects`);34    let { sep, start, end, assign } = format;35    const entries = Object.entries(object);36    yield start;37    stack.push('object');38    for await (const [key, value] of entries) {39        yield `${formatKey(key, lang)}${assign}`;40        yield* lang.pull(value, stack);41        yield sep;42    }43    stack.pop();44    yield end;45};46// convert to language array/list47const reprIterable = async function*(48    iterable: AnyIterable,49    lang: LanguageInterface,50    stack: StackInterface,51    length?: number52): AnyIterable<string> {53    if (!lang.format.iterable) {54        return;55    }56    const { sep, start, end } = lang.format.iterable;57    const iter = iterator(iterable) as AnyIterable & AnyIterator;58    if (start) yield start;59    stack.push('iterable');60    const first = await iter.next();61    if (!first.done) {62        yield* lang.pull(first.value, stack);63    }64    // handle remaining65    for await (const value of iter) {66        yield sep;67        yield* lang.pull(value, stack);68    }69    stack.pop();70    if (end) yield end;71};72// default is double quoted strings73const reprString = (value: string) => `"${value.replace(/[\\"]/g, '\\$&')}"`;74const reprBoolean = (value: boolean, lang: LanguageInterface) =>75    value ? lang.consts.true || 'true' : lang.consts.false || 'false';76const reprDate = (date: Date, lang: LanguageInterface, stack: StackInterface) =>77    lang.reprs.string!(date.toISOString(), lang, stack);78const reprBigInt = String;79const reprNumber = String;80const validName = /^[a-zA-Z_]\w+$/;81const formatName = (value: string, lang: LanguageInterface) => {82    lang.invalid(validName.test(value), `${value}`, 'name');83    return value;84};85const validShrink = new Set(Object.values(Shrink));86const normalizeShrink = (value: boolean | Shrink): Shrink => {87    if (value === true) {88        return Shrink.ALL;89    } else if (value === false) {90        return Shrink.NONE;91    }92    return value;93};94export const defaults: Required<LanguageDefinition> = {95    shrinkBigInt: Shrink.SMALL,96    reprs: {97        string: reprString,98        boolean: reprBoolean,99        number: reprNumber,100        bigint: reprBigInt,101        date: reprDate,102        iterable: reprIterable,103        object: reprObject104    },105    consts: {106        true: 'true',107        false: 'false',108        null: null,109        invalid_date: null,110        nan: null,111        positive_infinity: null,112        negative_infinity: null,113        undefined: null114    },115    format: {116        indent: '  ',117        eol: '\n',118        declare: {119            name: formatName,120            assign: ' = ',121            start: '[',122            end: ']',123            sep: ', '124        },125        // 2 space indentation126        iterable: {127            sep: ', ',128            start: '[',129            end: ']',130            // array of types that are valid131            valid: false,132            // array of types that are invalid133            invalid: false134        },135        object: {136            key: reprString,137            sep: ', ',138            start: '{',139            end: '}',140            assign: ': ',141            // array of types that are valid142            valid: false,143            // array of types that are invalid144            invalid: false145            // break into new146            // into length147        }148    }149};150export class Stack implements StackInterface {151    top?: { type: ReprAllTypes; indent: string };152    stack: { type: ReprAllTypes; indent: string }[];153    constructor() {154        this.top = undefined;155        this.stack = [];156    }157    push(type: ReprAllTypes, indent?: string) {158        const defIndent = (this.top && this.top.indent) || '';159        const item = {160            type,161            indent: indent != null ? indent : defIndent162        };163        this.top = item;164        this.stack.push(item);165        return this.top;166    }167    pop() {168        return (this.top = this.stack.pop());169    }170}171const createStack = (root: ReprContainerType = 'root'): StackInterface => {172    const stack = new Stack();173    stack.push(root);174    return stack;175};176export class Language {177    name: string;178    shrinkBigInt: Shrink;179    reprs: LanguageReprs;180    consts: LanguageConsts;181    format: LanguageFormat;182    static isLanguage(value: any): value is Language {183        return value && value instanceof Language;184    }185    constructor(name: string, config: LanguageDefinition) {186        this.name = name;187        const shrink = config.shrinkBigInt;188        if (shrink === false) {189            this.shrinkBigInt = Shrink.NONE;190        } else if (shrink === true) {191            this.shrinkBigInt = Shrink.ALL;192        } else if (shrink) {193            if (!validShrink.has(shrink)) {194                throw new Error(`${shrink} must be one of ${validShrink}`);195            }196            this.shrinkBigInt = shrink;197        } else {198            this.shrinkBigInt = normalizeShrink(defaults.shrinkBigInt);199        }200        // @ts-ignore201        this.format = merge(defaults.format, config.format || {});202        this.reprs = merge(defaults.reprs, config.reprs || {});203        this.consts = merge(defaults.consts, config.consts || {});204    }205    type(val: any): ReprType {206        let type: ReprType = typeof val;207        if (type === 'number') {208            if (Number.isNaN(val)) {209                type = 'nan';210            } else if (val === Number.NEGATIVE_INFINITY) {211                type = 'negative_infinity';212            } else if (val === Number.POSITIVE_INFINITY) {213                type = 'positive_infinity';214            }215        } else if (type === 'object') {216            if (val === null) {217                type = 'null';218            } else if (REPR in val) {219                // supports the repr protocol220                return 'repr';221            } else if (Symbol.iterator in val || Symbol.asyncIterator in val) {222                type = 'iterable';223            } else if (isDate(val)) {224                type = isNaN((val as unknown) as number)225                    ? 'invalid_date'226                    : 'date';227            } else if (isPlainObject(val)) {228                type = 'object';229            } else {230                type = 'custom';231            }232        }233        return type;234    }235    invalid(condition: any, what: string, type: string): asserts condition {236        if (!condition) {237            throw new Error(`${what} is an invalid ${type} for ${this.name}`);238        }239    }240    unsupported(condition: any, what: string): asserts condition {241        if (!condition) {242            throw new Error(`${what} not supported by ${this.name}`);243        }244    }245    maybeShrink(246        val: bigint,247        bigintRepr: ReprFunction<bigint> | null | undefined,248        stack: StackInterface249    ) {250        // handle bigint251        const shrink = this.shrinkBigInt;252        if (253            shrink === Shrink.ALL ||254            (shrink === Shrink.SMALL &&255                !(256                    val < Number.MIN_SAFE_INTEGER ||257                    val > Number.MAX_SAFE_INTEGER258                ))259        ) {260            // change for error message261            const repr = this.reprs.number;262            this.unsupported(repr, `[number] (from [bigint])`);263            return repr(Number(val), this, stack);264        }265        this.unsupported(bigintRepr, `[bigint]`);266        return bigintRepr(val, this, stack);267    }268    allowedWithin(type: ReprType, parent: ReprType | ReprContainerType) {269        const details = (this.format as { [key: string]: any })[type];270        if (271            details &&272            // black list273            ((details.invalid && details.invalid.indexOf(parent) > 0) ||274                // white list275                (details.valid && details.valid.indexOf(parent) < 0))276        ) {277            return false;278        }279        return true;280    }281    // ensure this type is allowed in it's parent type282    assertAllowed(type: ReprType, stack: StackInterface) {283        const top = stack.top;284        if (top && !this.allowedWithin(type, top.type)) {285            throw new Error(286                `[${type}] not allowed in [${top.type}] for ${this.name}`287            );288        }289    }290    // get language representation of value291    repr(value: any, stack: StackInterface): ReprReturn {292        let type = this.type(value);293        if (type === 'repr') {294            // value supports repr protocol so return295            // return can be a function|promise<string|function>296            // functions will be called repeatedly until not a function is resolved297            // also iterable/asyncIterable<string> can be returnedÃÃ298            return value[REPR];299        }300        const constant = this.consts[type];301        if (constant != null) {302            return constant;303        }304        const repr: ReprFunction<any> = this.reprs[type];305        // handle big int306        if (type === 'bigint') {307            return this.maybeShrink(value, repr, stack);308        }309        this.assertAllowed(type, stack);310        this.unsupported(repr, `[${type}]`);311        if (type === 'iterable') {312            // pass in length313            const length = Array.isArray(value) ? value.length : undefined;314            return (repr as ReprIterableFunction)(value, this, stack, length);315        }316        return repr(value, this, stack);317    }318    async *declare(319        entries: Iterable<[string, any]>,320        stack?: StackInterface | ReprContainerType321    ): AsyncGenerator<string, void> {322        if (!this.format.declare) {323            return;324        }325        if (!stack || typeof stack === 'string') {326            stack = createStack(stack ?? 'declare');327        }328        const { start, end, name, assign } = this.format.declare;329        if (start) {330            yield start;331        }332        for (const [key, value] of entries) {333            yield `${name(key, this)}${assign}`;334            yield* this.pull(value, stack);335        }336        if (end) {337            yield end;338        }339    }340    // ensure a repr return value is correctly used341    async *pull(342        value: any,343        stack?: StackInterface | ReprContainerType344    ): AsyncGenerator<string, void> {345        if (!stack || typeof stack === 'string') {346            stack = createStack(stack);347        }348        let result = await this.repr(await value, stack);349        // pull nested results;350        while (result && typeof result === 'function') {351            result = await result();352        }353        if (!result) {354            return;355        }356        // result should either be a string or iterable357        if (typeof result === 'string') {358            yield result;359        } else if (360            Symbol.iterator in result ||361            Symbol.asyncIterator in result362        ) {363            yield* result;364        } else {365            // unrepresented return value366            yield '';367        }368    }...

ShrinkBigInt.spec.ts

Source:ShrinkBigInt.spec.ts

...10  it('should always return empty stream when current equals target', () =>11    fc.assert(12      fc.property(fc.bigInt(), fc.boolean(), (value, tryAsap) => {13        // Arrange / Act14        const shrinks = [...shrinkBigInt(value, value, tryAsap)];15        // Assert16        expect(shrinks).toHaveLength(0);17      })18    ));19  it('should always starts stream with target when try asap is requested (when current not target)', () =>20    fc.assert(21      fc.property(fc.bigInt(), fc.bigInt(), (current, target) => {22        // Arrange23        fc.pre(current !== target);24        // Act25        const shrinks = [...shrinkBigInt(current, target, true)];26        // Assert27        expect(shrinks).not.toHaveLength(0);28        expect(shrinks[0].value).toBe(target);29        expect(shrinks[0].context).toBe(undefined);30      })31    ));32  it('should only include values between current and target in the stream', () =>33    fc.assert(34      fc.property(fc.bigInt(), fc.bigInt(), fc.boolean(), (current, target, tryAsap) => {35        // Arrange / Act36        const shrinks = [...shrinkBigInt(current, target, tryAsap)];37        const values = shrinks.map((v) => v.value);38        const min = (a: bigint, b: bigint) => (a < b ? a : b);39        const max = (a: bigint, b: bigint) => (a < b ? b : a);40        // Assert41        for (const v of values) {42          expect(v).toBeGreaterThanOrEqual(min(current, target));43          expect(v).toBeLessThanOrEqual(max(current, target));44        }45      })46    ));47  it('should never include current in the stream', () =>48    fc.assert(49      fc.property(fc.bigInt(), fc.bigInt(), fc.boolean(), (current, target, tryAsap) => {50        // Arrange / Act51        const shrinks = [...shrinkBigInt(current, target, tryAsap)];52        const values = shrinks.map((v) => v.value);53        // Assert54        expect(values).not.toContain(current);55      })56    ));57  it('should never include target in the stream when try asap is not requested', () =>58    fc.assert(59      fc.property(fc.bigInt(), fc.bigInt(), (current, target) => {60        // Arrange / Act61        const shrinks = [...shrinkBigInt(current, target, false)];62        const values = shrinks.map((v) => v.value);63        // Assert64        expect(values).not.toContain(target);65      })66    ));67  it('should always set context to be the value of previous entry in the stream', () =>68    fc.assert(69      fc.property(fc.bigInt(), fc.bigInt(), fc.boolean(), (current, target, tryAsap) => {70        // Arrange / Act71        const shrinks = [...shrinkBigInt(current, target, tryAsap)];72        // Assert73        for (let idx = 1; idx < shrinks.length; ++idx) {74          expect(shrinks[idx].context).toBe(shrinks[idx - 1].value);75        }76      })77    ));78  it('should specify first context of the stream to target if and only if no try asap, undefined otherwise', () =>79    fc.assert(80      fc.property(fc.bigInt(), fc.bigInt(), fc.boolean(), (current, target, tryAsap) => {81        // Arrange82        const expectedFirstContext = tryAsap ? undefined : target;83        // Act84        const first = shrinkBigInt(current, target, tryAsap).getNthOrLast(0);85        // Assert86        if (first !== null) {87          expect(first.context).toBe(expectedFirstContext);88        }89      })90    ));91  it('should always strictly increase distance from target as we move in the stream', () =>92    fc.assert(93      fc.property(fc.bigInt(), fc.bigInt(), fc.boolean(), (current, target, tryAsap) => {94        // Arrange / Act95        const shrinks = [...shrinkBigInt(current, target, tryAsap)];96        const absDiff = (a: bigint, b: bigint): bigint => {97          const result = a - b;98          return result >= 0 ? result : -result;99        };100        // Assert101        for (let idx = 1; idx < shrinks.length; ++idx) {102          const previousDistance = absDiff(shrinks[idx - 1].value, target);103          const currentDistance = absDiff(shrinks[idx].value, target);104          expect(currentDistance).toBeGreaterThan(previousDistance);105        }106      })107    ));...

shrinkBigInt.ts

Source:shrinkBigInt.ts

1/**2 * @tsplus static effect/core/testing/Sample.Ops shrinkBigInt3 */4export function shrinkBigInt(smallest: bigint) {5  return (a: bigint): Sample<never, bigint> =>6    Sample.unfold(a, (max) =>7      Tuple(8        max,9        Stream.unfold(smallest, (min) => {10          const mid = min + (max - min) / BigInt(2)11          if (mid === max) {12            return Maybe.none13          } else if (bigIntAbs(max - mid) === BigInt(1)) {14            return Maybe.some(Tuple(mid, max))15          } else {16            return Maybe.some(Tuple(mid, mid))17          }18        })...

Using AI Code Generation

1const {shrinkBigInt} = require('fast-check');2const {shrinkNumber} = require('fast-check');3const {shrinkString} = require('fast-check');4const {shrinkArray} = require('fast-check');5const {shrinkObject} = require('fast-check');6const bigint = 123n;7const number = 123;8const string = 'abc';9const array = ['a', 'b', 'c'];10const object = {a: 1, b: 2, c: 3};11const shrinkedBigInt = shrinkBigInt(bigint);12const shrinkedNumber = shrinkNumber(number);13const shrinkedString = shrinkString(string);14const shrinkedArray = shrinkArray(array);15const shrinkedObject = shrinkObject(object);16console.log(shrinkedBigInt);17console.log(shrinkedNumber);18console.log(shrinkedString);19console.log(shrinkedArray);20console.log(shrinkedObject);

Using AI Code Generation

1const { shrinkBigInt } = require('fast-check');2const bigInt = 12345678901234567890n;3const shrunkBigInt = shrinkBigInt(bigInt);4console.log(shrunkBigInt);5const { Arbitrary } = require('fast-check');6const bigInt = 12345678901234567890n;7const shrunkBigInt = Arbitrary.shrinkBigInt(bigInt);8console.log(shrunkBigInt);9if (bigInt === 0n) {10    return 0n;11}12if (bigInt === 1n) {13    return 0n;14}15if (bigInt === 2n) {16    return 1n;17}18if (bigInt === -1n) {19    return 0n;20}21if (bigInt === -2n) {22    return -1n;23}24if (bigInt % 2n === 0n) {25    return bigInt / 2n;26}27return (bigInt - 1n) / 2n;

Using AI Code Generation

1var fc = require('fast-check');2var bigInt = require('big-integer');3var shrinkBigInt = require('fast-check/lib/arbitrary/helpers/ShrinkBigInt.js').shrinkBigInt;4var arb = fc.bigInt();5var value = bigInt('12345678901234567890');6var shrunk = shrinkBigInt(value, arb);7console.log(shrunk);8var fc = require('fast-check');9var bigInt = require('big-integer');10var shrinkBigInt = require('fast-check/lib/arbitrary/helpers/ShrinkBigInt.js').shrinkBigInt;11var arb = fc.bigInt();12var value = bigInt('12345678901234567890');13var shrunk = shrinkBigInt(value, arb);14var expected = [ 1234567890123456789n, 123456789012345679n, 12345678901234568n, 1234567890123457n, 123456789012346n, 12345678901235n, 1234567890124n, 123456789013n, 12345678902n, 1234567891n, 123456790n, 12345679n, 1234568n, 123457n, 12346n, 1235n, 124n, 13n, 2n, 1n ];15test('ShrinkBigInt method', () => {

Using AI Code Generation

1const { shrinkBigInt } = require("fast-check");2const bigInt = 1234567890123456789n;3const shrunkBigInt = shrinkBigInt(bigInt);4console.log(shrunkBigInt);5const { shrinkBigInt } = require("fast-check");6const bigInt = 1234567890123456789n;7const shrunkBigInt = shrinkBigInt(bigInt);8console.log(shrunkBigInt);9const { shrinkBigInt } = require("fast-check");10const bigInt = 1234567890123456789n;11const shrunkBigInt = shrinkBigInt(bigInt);12console.log(shrunkBigInt);13const { shrinkBigInt } = require("fast-check");14const bigInt = 1234567890123456789n;15const shrunkBigInt = shrinkBigInt(bigInt);16console.log(shrunkBigInt);17const { shrinkBigInt } = require("fast-check");18const bigInt = 1234567890123456789n;19const shrunkBigInt = shrinkBigInt(bigInt);20console.log(shrunkBigInt);21const { shrinkBigInt } = require("fast-check");22const bigInt = 1234567890123456789n;23const shrunkBigInt = shrinkBigInt(bigInt);24console.log(shrunkBigInt);25const { shrinkBigInt } = require("fast-check");26const bigInt = 1234567890123456789n;27const shrunkBigInt = shrinkBigInt(bigInt);

Using AI Code Generation

1const fc = require('fast-check');2const { shrinkBigInt } = require('fast-check/lib/src/check/arbitrary/definition/Shrinkable.js');3const bigIntArb = fc.bigInt();4const bigIntShrink = shrinkBigInt(bigIntArb);5const bigIntShrinkable = bigIntArb.generate(fc.random(42));6console.log(bigIntShrinkable.value);7console.log(bigIntShrink(bigIntShrinkable));

Using AI Code Generation

1const fc = require('fast-check');2const shrinkBigInt = require('fast-check/lib/arbitrary/shrinkBigInt').shrinkBigInt;3const bigIntArb = fc.bigInt();4fc.assert(5    fc.property(bigIntArb, (n) => {6        const shrinked = shrinkBigInt(n);7        return shrinked.every((s) => s < n);8    })9);

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