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Add fuzzing based tests in Jest (jestjs#8012)
* Automatic bug detection with property based testing * Switch to built-in fc.anything() * Disable Map into fc.anything() * Rewrite matcher.property.test in TS * Update properties following review * Ignore key ordering for Set and Map * Remove potentially unstable property * One spec by matcher for property based tests * Add missing copyright * Ignore __arbitraries__ * Remove unecessary comments
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8 files changed

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-1
lines changed

‎jest.config.js

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@@ -31,6 +31,7 @@ module.exports = {
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],
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testEnvironment: './packages/jest-environment-node',
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testPathIgnorePatterns: [
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'/__arbitraries__/',
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'/node_modules/',
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'/examples/',
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'/e2e/.*/__tests__',

‎package.json

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@@ -39,6 +39,7 @@
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"eslint-plugin-react": "^7.1.0",
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"eslint-plugin-relay": "~0.0.19",
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"execa": "^1.0.0",
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"fast-check": "^1.12.0",
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"glob": "^7.1.1",
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"graceful-fs": "^4.1.15",
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"isbinaryfile": "^4.0.0",

‎packages/expect/src/__tests__/__arbitraries__/sharedSettings.ts

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/**
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* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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*/
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import fc from 'fast-check';
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// settings for anything arbitrary
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export const anythingSettings = {
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key: fc.oneof(fc.string(), fc.constantFrom('k1', 'k2', 'k3')),
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withBoxedValues: true,
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// Issue #7975 have to be fixed before enabling the generation of Map
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withMap: false,
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// Issue #7975 have to be fixed before enabling the generation of Set
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withSet: false,
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};
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// assertion settings
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export const assertSettings = {}; // eg.: {numRuns: 10000}

‎packages/expect/src/__tests__/matchers-toContain.property.test.ts

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/**
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* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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*/
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import fc from 'fast-check';
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import {
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anythingSettings,
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assertSettings,
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} from './__arbitraries__/sharedSettings';
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describe('toContain', () => {
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it('should always find the value when inside the array', () => {
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fc.assert(
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fc.property(
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fc.array(fc.anything(anythingSettings)),
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fc.array(fc.anything(anythingSettings)),
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fc.anything(anythingSettings).filter(v => !Number.isNaN(v)),
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(startValues, endValues, v) => {
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// Given: startValues, endValues arrays and v value (not NaN)
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expect([...startValues, v, ...endValues]).toContain(v);
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},
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),
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assertSettings,
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);
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});
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it('should not find the value if it has been cloned into the array', () => {
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fc.assert(
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fc.property(
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fc.array(fc.anything(anythingSettings)),
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fc.array(fc.anything(anythingSettings)),
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fc.dedup(fc.anything(anythingSettings), 2),
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(startValues, endValues, [a, b]) => {
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// Given: startValues, endValues arrays
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// and [a, b] equal, but not the same values
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// with `typeof a === 'object && a !== null`
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fc.pre(typeof a === 'object' && a !== null);
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expect([...startValues, a, ...endValues]).not.toContain(b);
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},
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),
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assertSettings,
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);
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});
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});

‎packages/expect/src/__tests__/matchers-toContainEqual.property.test.ts

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/**
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* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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*/
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import fc from 'fast-check';
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import {
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anythingSettings,
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assertSettings,
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} from './__arbitraries__/sharedSettings';
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describe('toContainEqual', () => {
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it('should always find the value when inside the array', () => {
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fc.assert(
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fc.property(
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fc.array(fc.anything(anythingSettings)),
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fc.array(fc.anything(anythingSettings)),
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fc.anything(anythingSettings),
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(startValues, endValues, v) => {
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// Given: startValues, endValues arrays and v any value
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expect([...startValues, v, ...endValues]).toContainEqual(v);
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},
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),
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assertSettings,
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);
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});
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it('should always find the value when cloned inside the array', () => {
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fc.assert(
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fc.property(
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fc.array(fc.anything(anythingSettings)),
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fc.array(fc.anything(anythingSettings)),
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fc.dedup(fc.anything(anythingSettings), 2),
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(startValues, endValues, [a, b]) => {
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// Given: startValues, endValues arrays
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// and [a, b] identical values
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expect([...startValues, a, ...endValues]).toContainEqual(b);
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},
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),
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assertSettings,
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);
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});
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});

‎packages/expect/src/__tests__/matchers-toEqual.property.test.ts

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/**
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* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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*/
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import fc from 'fast-check';
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import {
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anythingSettings,
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assertSettings,
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} from './__arbitraries__/sharedSettings';
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describe('toEqual', () => {
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it('should be reflexive', () => {
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fc.assert(
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fc.property(fc.dedup(fc.anything(anythingSettings), 2), ([a, b]) => {
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// Given: a and b identical values
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expect(a).toEqual(b);
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}),
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assertSettings,
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);
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});
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it('should be symmetric', () => {
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const safeExpectEqual = (a, b) => {
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try {
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expect(a).toEqual(b);
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return true;
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} catch (err) {
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return false;
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}
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};
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fc.assert(
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fc.property(
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fc.anything(anythingSettings),
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fc.anything(anythingSettings),
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(a, b) => {
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// Given: a and b values
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// Assert: We expect `expect(a).toEqual(b)`
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// to be equivalent to `expect(b).toEqual(a)`
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expect(safeExpectEqual(a, b)).toBe(safeExpectEqual(b, a));
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},
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),
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{
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...assertSettings,
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examples: [
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[0, 5e-324], // Issue #7941
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// [
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// new Set([false, true]),
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// new Set([new Boolean(true), new Boolean(true)]),
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// ], // Issue #7975
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],
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},
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);
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});
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});

‎packages/expect/src/__tests__/matchers-toStrictEqual.property.test.ts

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/**
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* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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*/
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import fc from 'fast-check';
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import {
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anythingSettings,
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assertSettings,
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} from './__arbitraries__/sharedSettings';
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describe('toStrictEqual', () => {
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it('should be reflexive', () => {
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fc.assert(
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fc.property(fc.dedup(fc.anything(anythingSettings), 2), ([a, b]) => {
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// Given: a and b identical values
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expect(a).toStrictEqual(b);
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}),
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assertSettings,
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);
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});
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it('should be symmetric', () => {
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const safeExpectStrictEqual = (a, b) => {
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try {
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expect(a).toStrictEqual(b);
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return true;
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} catch (err) {
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return false;
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}
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};
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fc.assert(
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fc.property(
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fc.anything(anythingSettings),
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fc.anything(anythingSettings),
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(a, b) => {
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// Given: a and b values
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// Assert: We expect `expect(a).toStrictEqual(b)`
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// to be equivalent to `expect(b).toStrictEqual(a)`
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expect(safeExpectStrictEqual(a, b)).toBe(safeExpectStrictEqual(b, a));
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},
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),
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assertSettings,
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);
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});
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});

‎yarn.lock

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parse-node-version "^1.0.0"
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time-stamp "^1.0.0"
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fast-check@^1.12.0:
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version "1.12.0"
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resolved "https://registry.yarnpkg.com/fast-check/-/fast-check-1.12.0.tgz#bff7908aa357703f207ee1877ffcf4486a698aa0"
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integrity sha512-r/zmvxG/8IsxyOzf9T6wnjJQjSLmymAETeRVfs4/0VzxBmyK48o871BRKmEIgEBLmrg9klh3e4A4BZc3yrH2QQ==
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dependencies:
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lorem-ipsum "~1.0.6"
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pure-rand "^1.6.2"
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fast-deep-equal@^2.0.1:
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version "2.0.1"
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resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz#7b05218ddf9667bf7f370bf7fdb2cb15fdd0aa49"
@@ -8348,6 +8356,13 @@ loose-envify@^1.0.0, loose-envify@^1.1.0, loose-envify@^1.3.1, loose-envify@^1.4
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dependencies:
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js-tokens "^3.0.0 || ^4.0.0"
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lorem-ipsum@~1.0.6:
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version "1.0.6"
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resolved "https://registry.yarnpkg.com/lorem-ipsum/-/lorem-ipsum-1.0.6.tgz#69e9ab02bbb0991915d71b5559fe016d526f013f"
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integrity sha512-Rx4XH8X4KSDCKAVvWGYlhAfNqdUP5ZdT4rRyf0jjrvWgtViZimDIlopWNfn/y3lGM5K4uuiAoY28TaD+7YKFrQ==
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dependencies:
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minimist "~1.2.0"
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loud-rejection@^1.0.0:
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version "1.6.0"
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resolved "https://registry.yarnpkg.com/loud-rejection/-/loud-rejection-1.6.0.tgz#5b46f80147edee578870f086d04821cf998e551f"
@@ -8912,7 +8927,7 @@ minimist@0.0.8:
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resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
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integrity sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=
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minimist@1.2.0, minimist@^1.1.1, minimist@^1.1.3, minimist@^1.2.0:
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minimist@1.2.0, minimist@^1.1.1, minimist@^1.1.3, minimist@^1.2.0, minimist@~1.2.0:
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version "1.2.0"
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resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
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integrity sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=
@@ -10690,6 +10705,11 @@ punycode@^2.1.0, punycode@^2.1.1:
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resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.1.tgz#b58b010ac40c22c5657616c8d2c2c02c7bf479ec"
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integrity sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==
1069210707

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pure-rand@^1.6.2:
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version "1.6.2"
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resolved "https://registry.yarnpkg.com/pure-rand/-/pure-rand-1.6.2.tgz#90b3ae78efe36f7e6e27bfffedf934f77382e6e6"
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integrity sha512-HNwHOH63m7kCxe0kWEe5jSLwJiL2N83RUUN8POniFuZS+OsbFcMWlvXgxIU2nwKy2zYG2bQan40WBNK4biYPRg==
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q@0.9.7:
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version "0.9.7"
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resolved "https://registry.yarnpkg.com/q/-/q-0.9.7.tgz#4de2e6cb3b29088c9e4cbc03bf9d42fb96ce2f75"

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