KaneAI - World’s First E2E Software Testing Agent.Book a Demo Join TestMu Conference

How to use orUndefined method in fast-check-monorepo

Best JavaScript code snippet using fast-check-monorepo

ReactEmptyComponent-test.js

Source:ReactEmptyComponent-test.js

1/**2 * Copyright (c) Facebook, Inc. and its affiliates.3 *4 * This source code is licensed under the MIT license found in the5 * LICENSE file in the root directory of this source tree.6 *7 * @emails react-core8 */9'use strict';10let React;11let ReactDOM;12let ReactTestUtils;13let TogglingComponent;14let log;15describe('ReactEmptyComponent', () => {16  beforeEach(() => {17    jest.resetModules();18    React = require('react');19    ReactDOM = require('react-dom');20    ReactTestUtils = require('react-dom/test-utils');21    log = jest.fn();22    TogglingComponent = class extends React.Component {23      state = {component: this.props.firstComponent};24      componentDidMount() {25        log(ReactDOM.findDOMNode(this));26        this.setState({component: this.props.secondComponent});27      }28      componentDidUpdate() {29        log(ReactDOM.findDOMNode(this));30      }31      render() {32        const Component = this.state.component;33        return Component ? <Component /> : null;34      }35    };36  });37  describe.each([null, undefined])('when %s', nullORUndefined => {38    it('should not throw when rendering', () => {39      class Component extends React.Component {40        render() {41          return nullORUndefined;42        }43      }44      expect(function() {45        ReactTestUtils.renderIntoDocument(<Component />);46      }).not.toThrowError();47    });48    it('should not produce child DOM nodes for nullish and false', () => {49      class Component1 extends React.Component {50        render() {51          return nullORUndefined;52        }53      }54      class Component2 extends React.Component {55        render() {56          return false;57        }58      }59      const container1 = document.createElement('div');60      ReactDOM.render(<Component1 />, container1);61      expect(container1.children.length).toBe(0);62      const container2 = document.createElement('div');63      ReactDOM.render(<Component2 />, container2);64      expect(container2.children.length).toBe(0);65    });66    it('should be able to switch between rendering nullish and a normal tag', () => {67      const instance1 = (68        <TogglingComponent69          firstComponent={nullORUndefined}70          secondComponent={'div'}71        />72      );73      const instance2 = (74        <TogglingComponent75          firstComponent={'div'}76          secondComponent={nullORUndefined}77        />78      );79      ReactTestUtils.renderIntoDocument(instance1);80      ReactTestUtils.renderIntoDocument(instance2);81      expect(log).toHaveBeenCalledTimes(4);82      expect(log).toHaveBeenNthCalledWith(1, null);83      expect(log).toHaveBeenNthCalledWith(84        2,85        expect.objectContaining({tagName: 'DIV'}),86      );87      expect(log).toHaveBeenNthCalledWith(88        3,89        expect.objectContaining({tagName: 'DIV'}),90      );91      expect(log).toHaveBeenNthCalledWith(4, null);92    });93    it('should be able to switch in a list of children', () => {94      const instance1 = (95        <TogglingComponent96          firstComponent={nullORUndefined}97          secondComponent={'div'}98        />99      );100      ReactTestUtils.renderIntoDocument(101        <div>102          {instance1}103          {instance1}104          {instance1}105        </div>,106      );107      expect(log).toHaveBeenCalledTimes(6);108      expect(log).toHaveBeenNthCalledWith(1, null);109      expect(log).toHaveBeenNthCalledWith(2, null);110      expect(log).toHaveBeenNthCalledWith(3, null);111      expect(log).toHaveBeenNthCalledWith(112        4,113        expect.objectContaining({tagName: 'DIV'}),114      );115      expect(log).toHaveBeenNthCalledWith(116        5,117        expect.objectContaining({tagName: 'DIV'}),118      );119      expect(log).toHaveBeenNthCalledWith(120        6,121        expect.objectContaining({tagName: 'DIV'}),122      );123    });124    it('should distinguish between a script placeholder and an actual script tag', () => {125      const instance1 = (126        <TogglingComponent127          firstComponent={nullORUndefined}128          secondComponent={'script'}129        />130      );131      const instance2 = (132        <TogglingComponent133          firstComponent={'script'}134          secondComponent={nullORUndefined}135        />136      );137      expect(function() {138        ReactTestUtils.renderIntoDocument(instance1);139      }).not.toThrow();140      expect(function() {141        ReactTestUtils.renderIntoDocument(instance2);142      }).not.toThrow();143      expect(log).toHaveBeenCalledTimes(4);144      expect(log).toHaveBeenNthCalledWith(1, null);145      expect(log).toHaveBeenNthCalledWith(146        2,147        expect.objectContaining({tagName: 'SCRIPT'}),148      );149      expect(log).toHaveBeenNthCalledWith(150        3,151        expect.objectContaining({tagName: 'SCRIPT'}),152      );153      expect(log).toHaveBeenNthCalledWith(4, null);154    });155    it(156      'should have findDOMNode return null when multiple layers of composite ' +157        'components render to the same nullish placeholder',158      () => {159        class GrandChild extends React.Component {160          render() {161            return nullORUndefined;162          }163        }164        class Child extends React.Component {165          render() {166            return <GrandChild />;167          }168        }169        const instance1 = (170          <TogglingComponent firstComponent={'div'} secondComponent={Child} />171        );172        const instance2 = (173          <TogglingComponent firstComponent={Child} secondComponent={'div'} />174        );175        expect(function() {176          ReactTestUtils.renderIntoDocument(instance1);177        }).not.toThrow();178        expect(function() {179          ReactTestUtils.renderIntoDocument(instance2);180        }).not.toThrow();181        expect(log).toHaveBeenCalledTimes(4);182        expect(log).toHaveBeenNthCalledWith(183          1,184          expect.objectContaining({tagName: 'DIV'}),185        );186        expect(log).toHaveBeenNthCalledWith(2, null);187        expect(log).toHaveBeenNthCalledWith(3, null);188        expect(log).toHaveBeenNthCalledWith(189          4,190          expect.objectContaining({tagName: 'DIV'}),191        );192      },193    );194    it('works when switching components', () => {195      let assertions = 0;196      class Inner extends React.Component {197        render() {198          return <span />;199        }200        componentDidMount() {201          // Make sure the DOM node resolves properly even if we're replacing a202          // `null` component203          expect(ReactDOM.findDOMNode(this)).not.toBe(null);204          assertions++;205        }206        componentWillUnmount() {207          // Even though we're getting replaced by `null`, we haven't been208          // replaced yet!209          expect(ReactDOM.findDOMNode(this)).not.toBe(null);210          assertions++;211        }212      }213      class Wrapper extends React.Component {214        render() {215          return this.props.showInner ? <Inner /> : nullORUndefined;216        }217      }218      const el = document.createElement('div');219      let component;220      // Render the <Inner /> component...221      component = ReactDOM.render(<Wrapper showInner={true} />, el);222      expect(ReactDOM.findDOMNode(component)).not.toBe(null);223      // Switch to null...224      component = ReactDOM.render(<Wrapper showInner={false} />, el);225      expect(ReactDOM.findDOMNode(component)).toBe(null);226      // ...then switch back.227      component = ReactDOM.render(<Wrapper showInner={true} />, el);228      expect(ReactDOM.findDOMNode(component)).not.toBe(null);229      expect(assertions).toBe(3);230    });231    it('can render nullish at the top level', () => {232      const div = document.createElement('div');233      ReactDOM.render(nullORUndefined, div);234      expect(div.innerHTML).toBe('');235    });236    it('does not break when updating during mount', () => {237      class Child extends React.Component {238        componentDidMount() {239          if (this.props.onMount) {240            this.props.onMount();241          }242        }243        render() {244          if (!this.props.visible) {245            return nullORUndefined;246          }247          return <div>hello world</div>;248        }249      }250      class Parent extends React.Component {251        update = () => {252          this.forceUpdate();253        };254        render() {255          return (256            <div>257              <Child key="1" visible={false} />258              <Child key="0" visible={true} onMount={this.update} />259              <Child key="2" visible={false} />260            </div>261          );262        }263      }264      expect(function() {265        ReactTestUtils.renderIntoDocument(<Parent />);266      }).not.toThrow();267    });268    it('preserves the dom node during updates', () => {269      class Empty extends React.Component {270        render() {271          return nullORUndefined;272        }273      }274      const container = document.createElement('div');275      ReactDOM.render(<Empty />, container);276      const noscript1 = container.firstChild;277      expect(noscript1).toBe(null);278      // This update shouldn't create a DOM node279      ReactDOM.render(<Empty />, container);280      const noscript2 = container.firstChild;281      expect(noscript2).toBe(null);282    });283    it('should not warn about React.forwardRef that returns nullish', () => {284      const Empty = () => {285        return nullORUndefined;286      };287      const EmptyForwardRef = React.forwardRef(Empty);288      expect(() => {289        ReactTestUtils.renderIntoDocument(<EmptyForwardRef />);290      }).not.toThrowError();291    });292    it('should not warn about React.memo that returns nullish', () => {293      const Empty = () => {294        return nullORUndefined;295      };296      const EmptyMemo = React.memo(Empty);297      expect(() => {298        ReactTestUtils.renderIntoDocument(<EmptyMemo />);299      }).not.toThrowError();300    });301  });...

Using AI Code Generation

1const fc = require("fast-check");2const { orUndefined } = require("fast-check-monorepo");3fc.assert(4  fc.property(orUndefined(fc.integer()), (i) => {5    return i === undefined || Number.isInteger(i);6  })7);8const fc = require("fast-check");9const { orUndefined } = require("fast-check-monorepo");10fc.assert(11  fc.property(orUndefined(fc.integer()), (i) => {12    return i === undefined || Number.isInteger(i);13  })14);15const fc = require("fast-check");16const { orUndefined } = require("fast-check-monorepo");17fc.assert(18  fc.property(orUndefined(fc.integer()), (i) => {19    return i === undefined || Number.isInteger(i);20  })21);22const fc = require("fast-check");23const { orUndefined } = require("fast-check-monorepo");24fc.assert(25  fc.property(orUndefined(fc.integer()), (i) => {26    return i === undefined || Number.isInteger(i);27  })28);29const fc = require("fast-check");30const { orUndefined } = require("fast-check-monorepo");31fc.assert(32  fc.property(orUndefined(fc.integer()), (i) => {33    return i === undefined || Number.isInteger(i);34  })35);36const fc = require("fast-check");37const { orUndefined } = require("fast-check-monorepo");38fc.assert(39  fc.property(orUndefined(fc.integer()), (i) => {40    return i === undefined || Number.isInteger(i);41  })42);43const fc = require("fast-check");44const { orUndefined } = require("fast-check-monorepo");45fc.assert(46  fc.property(orUndefined(fc.integer()), (i) => {47    return i === undefined || Number.isInteger(i);48  })49);

Using AI Code Generation

1const fc = require('fast-check');2const { orUndefined } = require('fast-check/lib/types/arbitrary/definition/ArbitraryWithShrink');3const { array } = require('fast-check/lib/types/arbitrary/ArrayArbitrary');4const { constantFrom } = require('fast-check/lib/types/arbitrary/ConstantArbitrary');5const { integer } = require('fast-check/lib/types/arbitrary/IntegerArbitrary');6const arr = array(constantFrom(1, 2, 3, 4, 5));7const arb = orUndefined(arr);8fc.assert(9  fc.property(arb, (x) => {10    if (x === null) {11      return true;12    }13    return arr.canShrinkWithoutContext(x);14  })15);16const fc = require('fast-check');17const { orUndefined } = require('fast-check/lib/types/arbitrary/definition/ArbitraryWithShrink');18const { array } = require('fast-check/lib/types/arbitrary/ArrayArbitrary');19const { constantFrom } = require('fast-check/lib/types/arbitrary/ConstantArbitrary');20const { integer } = require('fast-check/lib/types/arbitrary/IntegerArbitrary');21const arr = array(constantFrom(1, 2, 3, 4, 5));22const arb = orUndefined(arr);23fc.assert(24  fc.property(arb, (x) => {25    if (x === null) {26      return true;27    }28    return arr.canShrinkWithoutContext(x);29  })30);31const fc = require('fast-check');32const { orUndefined } = require('fast-check/lib/types/arbitrary/definition/ArbitraryWithShrink');33const { array } = require('fast-check/lib/types/arbitrary/ArrayArbitrary');34const { constantFrom } = require('fast-check/lib/types/arbitrary/ConstantArbitrary');35const { integer } = require('fast-check/lib/types/arbitrary/IntegerArbitrary');36const arr = array(constantFrom(1, 2, 3, 4, 5));37const arb = orUndefined(arr);38fc.assert(39  fc.property(arb, (x) => {40    if (x === null) {41      return true;42    }

Using AI Code Generation

1const {check, property} = require('fast-check');2const {orUndefined} = require('fast-check/lib/check/arbitrary/definition/ArbitraryWithShrink');3const arb = orUndefined(property.arb(property.integer()));4check(arb, {examples: [[undefined]]});5const {check, property} = require('fast-check');6const {orUndefined} = require('fast-check/lib/check/arbitrary/definition/ArbitraryWithShrink');7const arb = orUndefined(property.arb(property.integer()));8check(arb, {examples: [[undefined]]});9const {check, property} = require('fast-check');10const {orUndefined} = require('fast-check/lib/check/arbitrary/definition/ArbitraryWithShrink');11const arb = orUndefined(property.arb(property.integer()));12check(arb, {examples: [[undefined]]});13const {check, property} = require('fast-check');14const {orUndefined} = require('fast-check/lib/check/arbitrary/definition/ArbitraryWithShrink');15const arb = orUndefined(property.arb(property.integer()));16check(arb, {examples: [[undefined]]});17const {check, property} = require('fast-check');18const {orUndefined} = require('fast-check/lib/check/arbitrary/definition/ArbitraryWithShrink');19const arb = orUndefined(property.arb(property.integer()));20check(arb, {examples: [[undefined]]});21const {check, property} = require('fast-check');

Using AI Code Generation

1const {ArbitraryExtensions} = require('fast-check-monorepo/packages/arbitrary-extensions/dist/ArbitraryExtensions');2const {fc} = require('fast-check-monorepo/packages/fast-check/dist/index');3const arb = fc.string().orUndefined();4const arb = ArbitraryExtensions.orUndefined(fc.string());5const arb = ArbitraryExtensions.orUndefined(fc.string(), 'myUndefinedValue');6const arb = ArbitraryExtensions.orUndefined(fc.string(), () => 'myUndefinedValue');7const arb = ArbitraryExtensions.orUndefined(fc.string(), () => fc.oneof(fc.constant('myUndefinedValue'), fc.constant('myOtherUndefinedValue')));8const arb = ArbitraryExtensions.orUndefined(fc.string(), () => fc.oneof(fc.constant('myUndefinedValue'), fc.constant('myOtherUndefinedValue')), 'myUndefinedValue');9const arb = ArbitraryExtensions.orUndefined(fc.string(), () => fc.oneof(fc.constant('myUndefinedValue'), fc.constant('myOtherUndefinedValue')), () => 'myUndefinedValue');10const arb = ArbitraryExtensions.orUndefined(fc.string(), () => fc.oneof(fc.constant('myUndefinedValue'), fc.constant('myOtherUndefinedValue')), () => fc.oneof(fc.constant('myUndefinedValue'), fc.constant('myOtherUndefinedValue')));11const arb = ArbitraryExtensions.orUndefined(fc.string(), () => fc.oneof(fc.constant('myUndefinedValue'), fc.constant('myOtherUndefinedValue')), () => fc.oneof(fc.constant('myUndefinedValue'), fc.constant('myOtherUndefinedValue')), 'myUndefinedValue');12const arb = ArbitraryExtensions.orUndefined(fc.string(), () => fc.oneof(fc.constant('myUndefinedValue'), fc.constant('myOtherUndefinedValue')), () => fc.oneof(fc.constant('myUndefinedValue'), fc.constant('myOtherUndefinedValue')), () => 'myUndefinedValue');

Using AI Code Generation

1const fc = require('fast-check');2const { orUndefined } = require('fast-check-monorepo');3const prop = fc.property(orUndefined(fc.integer()), (value) => {4    return value === undefined || Number.isInteger(value);5});6fc.assert(prop, { numRuns: 1000 });7const fc = require('fast-check');8const { orUndefined } = require('fast-check-monorepo');9const prop = fc.property(orUndefined(fc.integer()), (value) => {10    return value === undefined || Number.isInteger(value);11});12fc.assert(prop, { numRuns: 1000 });13const fc = require('fast-check');14const { orUndefined } = require('fast-check-monorepo');15const prop = fc.property(orUndefined(fc.integer()), (value) => {16    return value === undefined || Number.isInteger(value);17});18fc.assert(prop, { numRuns: 1000 });19const fc = require('fast-check');20const { orUndefined } = require('fast-check-monorepo');21const prop = fc.property(orUndefined(fc.integer()), (value) => {22    return value === undefined || Number.isInteger(value);23});24fc.assert(prop, { numRuns: 1000 });25const fc = require('fast-check');26const { orUndefined } = require('fast-check-monorepo');27const prop = fc.property(orUndefined(fc.integer()), (value) => {28    return value === undefined || Number.isInteger(value);29});30fc.assert(prop, { numRuns: 1000 });31const fc = require('fast-check');32const { orUndefined } = require('fast-check-monorepo');33const prop = fc.property(orUndefined(fc.integer()), (value) => {34    return value === undefined || Number.isInteger(value);35});36fc.assert(prop, { numRuns: 1000 });37const fc = require('fast

Using AI Code Generation

1const fc = require("fast-check");2const { orUndefined } = fc;3const arb = orUndefined(fc.integer());4fc.assert(fc.property(arb, (v) => v === undefined || typeof v === "number"));5const fc = require("fast-check");6const { orUndefined } = fc;7const arb = orUndefined(fc.integer());8fc.assert(fc.property(arb, (v) => v === undefined || typeof v === "number"));9const fc = require("fast-check");10const { orUndefined } = fc;11const arb = orUndefined(fc.integer());12fc.assert(fc.property(arb, (v) => v === undefined || typeof v === "number"));13const fc = require("fast-check");14const { orUndefined } = fc;15const arb = orUndefined(fc.integer());16fc.assert(fc.property(arb, (v) => v === undefined || typeof v === "number"));17const fc = require("fast-check");18const { orUndefined } = fc;19const arb = orUndefined(fc.integer());20fc.assert(fc.property(arb, (v) => v === undefined || typeof v === "number"));21const fc = require("fast-check");22const { orUndefined } = fc;23const arb = orUndefined(fc.integer());24fc.assert(fc.property(arb, (v) => v === undefined || typeof v === "number"));25const fc = require("fast-check");26const { orUndefined } = fc;27const arb = orUndefined(fc.integer());28fc.assert(fc.property(arb, (v) => v === undefined || typeof v === "number"));29const fc = require("fast-check");30const { orUndefined } = fc;31const arb = orUndefined(fc.integer());32fc.assert(fc.property(arb, (v) => v

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.