How to use expectedConstantArb method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

option.spec.ts

Source:option.spec.ts

1import * as fc from 'fast-check';2import { option, OptionConstraints } from '../../../src/arbitrary/option';3import { FakeIntegerArbitrary, fakeArbitrary } from './__test-helpers__/ArbitraryHelpers';4import * as FrequencyArbitraryMock from '../../../src/arbitrary/_internals/FrequencyArbitrary';5import * as ConstantMock from '../../../src/arbitrary/constant';6import {7  assertProduceValuesShrinkableWithoutContext,8  assertProduceCorrectValues,9  assertShrinkProducesSameValueWithoutInitialContext,10  assertProduceSameValueGivenSameSeed,11} from './__test-helpers__/ArbitraryAssertions';12import { sizeArb } from './__test-helpers__/SizeHelpers';13function beforeEachHook() {14  jest.resetModules();15  jest.restoreAllMocks();16  fc.configureGlobal({ beforeEach: beforeEachHook });17}18beforeEach(beforeEachHook);19describe('option', () => {20  it('should call FrequencyArbitrary.from with the right parameters when called with constraints', () =>21    fc.assert(22      fc.property(23        fc.record(24          {25            depthIdentifier: fc.string(),26            depthSize: fc.oneof(fc.double({ min: 0, noNaN: true }), sizeArb),27            maxDepth: fc.nat(),28            freq: fc.nat(),29            nil: fc.anything(),30          },31          { requiredKeys: [] }32        ),33        (constraints: Partial<OptionConstraints<unknown>>) => {34          // Arrange35          const expectedNil = 'nil' in constraints ? constraints.nil : null;36          const expectedArb = fakeArbitrary().instance;37          const from = jest.spyOn(FrequencyArbitraryMock.FrequencyArbitrary, 'from');38          from.mockReturnValue(expectedArb);39          const expectedConstantArb = fakeArbitrary().instance;40          const constant = jest.spyOn(ConstantMock, 'constant');41          constant.mockReturnValue(expectedConstantArb);42          const { instance: arb } = fakeArbitrary();43          // Act44          const out = option(arb, constraints);45          // Assert46          expect(constant).toHaveBeenCalledWith(expectedNil);47          expect(from).toHaveBeenCalledWith(48            [49              { arbitrary: expectedConstantArb, weight: 1, fallbackValue: { default: expectedNil } },50              { arbitrary: arb, weight: 'freq' in constraints ? constraints.freq! : 5 },51            ],52            {53              withCrossShrink: true,54              depthSize: constraints.depthSize,55              maxDepth: constraints.maxDepth,56              depthIdentifier: constraints.depthIdentifier,57            },58            'fc.option'59          );60          expect(out).toBe(expectedArb);61        }62      )63    ));64  it('should call FrequencyArbitrary.from with the right parameters when called without constraints', () => {65    // Arrange66    const expectedArb = fakeArbitrary().instance;67    const from = jest.spyOn(FrequencyArbitraryMock.FrequencyArbitrary, 'from');68    from.mockReturnValue(expectedArb);69    const expectedConstantArb = fakeArbitrary().instance;70    const constant = jest.spyOn(ConstantMock, 'constant');71    constant.mockReturnValue(expectedConstantArb);72    const { instance: arb } = fakeArbitrary();73    // Act74    const out = option(arb);75    // Assert76    expect(constant).toHaveBeenCalledWith(null);77    expect(from).toHaveBeenCalledWith(78      [79        { arbitrary: expectedConstantArb, weight: 1, fallbackValue: { default: null } },80        { arbitrary: arb, weight: 5 },81      ],82      {83        withCrossShrink: true,84        depthSize: undefined,85        maxDepth: undefined,86        depthIdentifier: undefined,87      },88      'fc.option'89    );90    expect(out).toBe(expectedArb);91  });92});93describe('option (integration)', () => {94  type Extra = { freq?: number };95  const extraParameters = fc.record({ freq: fc.nat() }, { requiredKeys: [] });96  const isCorrect = (value: number | null, extra: Extra) =>97    value === null || ((extra.freq === undefined || extra.freq > 0) && typeof value === 'number');98  const optionBuilder = (extra: Extra) => option(new FakeIntegerArbitrary(), { ...extra, nil: null });99  it('should produce the same values given the same seed', () => {100    assertProduceSameValueGivenSameSeed(optionBuilder, { extraParameters });101  });102  it('should only produce correct values', () => {103    assertProduceCorrectValues(optionBuilder, isCorrect, { extraParameters });104  });105  it('should produce values seen as shrinkable without any context (if underlyings do)', () => {106    assertProduceValuesShrinkableWithoutContext(optionBuilder, { extraParameters });107  });108  it('should be able to shrink to the same values without initial context (if underlyings do)', () => {109    assertShrinkProducesSameValueWithoutInitialContext(optionBuilder, { extraParameters });110  });...

Using AI Code Generation

1const fc = require('fast-check');2const { expectedConstantArb } = require('fast-check-monorepo');3fc.assert(4  fc.property(expectedConstantArb, (x) => {5    return x === 10;6  })7);8node_modules/fast-check-monorepo/lib/check/arbitrary/ExpectedConstantArbitrary.d.ts:1:8 - error TS1259: Module '"/Users/xyz/xyz/xyz/node_modules/fast-check/lib/types.d.ts"' can only be default-imported using the 'esModuleInterop' flag91 import fc from 'fast-check';102 import { Random } from '../../random/generator/Random';113 import { Stream } from '../../stream/Stream';121 import fc from 'fast-check';132 import { Random } from '../../random/generator/Random';143 import { Stream } from '../../stream/Stream';152 import { Random } from '../../random/generator/Random';163 import { Stream } from '../../stream/Stream';174 import { Arbitrary } from './definition/Arbitrary';183 import { Stream } from '../../stream/Stream';194 import { Arbitrary } from './definition/Arbitrary';205 import { Shrinkable } from './

Using AI Code Generation

1const fc = require('fast-check-monorepo');2const { expectedConstantArb } = require('fast-check-monorepo');3const arb = expectedConstantArb(fc.integer(), 0);4fc.assert(5  fc.property(arb, (val) => {6    return val === 0;7  })8);

Using AI Code Generation

1import { expectedConstantArb } from 'fast-check-monorepo';2import * as fc from 'fast-check';3import { Arbitrary } from 'fast-check/lib/types/arbitrary/definition/Arbitrary';4import { ArbitraryWithShrink } from 'fast-check/lib/types/arbitrary/definition/ArbitraryWithShrink';5import { Shrinkable } from 'fast-check/lib/types/arbitrary/definition/Shrinkable';6const expectedConstantArb = <T>(value: T): ArbitraryWithShrink<T> =>7  new (class extends Arbitrary<T> {8    generate(mrng: Random): Shrinkable<T> {9      return new Shrinkable(value, () => this.shrink(value, mrng));10    }11    private *shrink(_value: T, _mrng: Random): IterableIterator<Shrinkable<T>> {12      return;13    }14    withBias(_freq: number): Arbitrary<T> {15      return this;16    }17  })();18describe('test', () => {19  it('should pass', () => {20    fc.assert(21      fc.property(expectedConstantArb('foo'), (value: string) => {22        expect(value).toBe('foo');23      }),24    );25  });26});27import { constant, number } from 'fast-check';28describe('test', () => {29  it('should pass', () => {30    fc.assert(31      fc.property(constant(1), (value: number) => {32        expect(value).toBe(1);33      }),34    );35  });36});37import { constant, number } from 'fast-check';38describe('test', () => {39  it('should pass',

Using AI Code Generation

1import { expectedConstantArb } from 'fast-check-monorepo';2import * as fc from 'fast-check';3const testArb = expectedConstantArb(fc.integer(), 5);4fc.assert(fc.property(testArb, (x) => x === 5));5import * as fc from 'fast-check';6const testArb = fc.expectedConstantArb(fc.integer(), 5);7fc.assert(fc.property(testArb, (x) => x === 5));

Using AI Code Generation

1const { expectedConstantArb } = require('fast-check-monorepo');2const fc = require('fast-check');3const assert = require('assert');4const constantArb = fc.constant(1);5const expectedConstantArb = expectedConstantArb(constantArb);6fc.assert(7  fc.property(expectedConstantArb, (v) => {8    assert(v === 1);9  })10);11const expectedConstantArb = expectedConstantArb(constantArb);12    at Object.<anonymous> (test.js:8:45)13    at Module._compile (internal/modules/cjs/loader.js:1137:30)14    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1157:10)15    at Module.load (internal/modules/cjs/loader.js:985:32)16    at Function.Module._load (internal/modules/cjs/loader.js:878:14)17    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)18OP: I found the reason for this. I was using the wrong import statement. It should be19const { expectedConstantArb } = require('fast-check-monorepo').default;20const { expectedConstantArb } = require('fast-check-monorepo');

Using AI Code Generation

1const fc = require("fast-check");2const { expectedConstantArb } = require("fast-check-monorepo");3fc.assert(fc.property(expectedConstantArb, (num) => num === 42));4{5  "dependencies": {6  }7}8const fc = require("fast-check");9const expectedConstantArb = fc.constant(42);10module.exports = {11};12{13  "dependencies": {14  }15}16const fc = require("fast-check");17const { expectedConstantArb } = require("fast-check-monorepo");18fc.assert(fc.property(expectedConstantArb, (num) => num === 42));19{20  "dependencies": {21  }22}23const fc = require("fast-check");24const { expectedConstantArb } = require("fast-check-monorepo");25fc.assert(fc.property(expectedConstantArb, (num) => num === 42));26{27  "dependencies": {28  }29}30const fc = require("fast-check");31const { expectedConstantArb } = require("fast-check

Using AI Code Generation

1import { expectedConstantArb } from 'fast-check-monorepo';2const arb = expectedConstantArb(42);3import { expectedConstantArb } from 'fast-check';4const arb = expectedConstantArb(42);5import { expectedConstantArb } from 'fast-check-monorepo';6const arb = expectedConstantArb(42);7import { expectedConstantArb } from 'fast-check';8const arb = expectedConstantArb(42);9import { expectedConstantArb } from 'fast-check-monorepo';10const arb = expectedConstantArb(42);11import { expectedConstantArb } from 'fast-check';12const arb = expectedConstantArb(42);13import { expectedConstantArb } from 'fast-check-monorepo';14const arb = expectedConstantArb(42);15import { expectedConstantArb } from 'fast-check';16const arb = expectedConstantArb(42);17import { expectedConstantArb } from 'fast-check-monorepo';18const arb = expectedConstantArb(42);19import { expected

Using AI Code Generation

1const { property, expectedConstantArb } = require("fast-check");2const { constantArb } = require("fast-check-monorepo");3const arb = expectedConstantArb(constantArb(1), 1, 0.5);4property(arb, (x) => {5  console.log(x);6  return true;7});8{9  "scripts": {10  },11  "dependencies": {12  }13}

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