Join the 1-day Testing & QA Summit featuring 15+ Expert Speakers.Register for FREE! Join TestMu Conference

How to use expectedRenderer method in testing-library-react-hooks

Best JavaScript code snippet using testing-library-react-hooks

_tsvb_markdown.ts

Source:_tsvb_markdown.ts

1/*2 * Licensed to Elasticsearch B.V. under one or more contributor3 * license agreements. See the NOTICE file distributed with4 * this work for additional information regarding copyright5 * ownership. Elasticsearch B.V. licenses this file to you under6 * the Apache License, Version 2.0 (the "License"); you may7 * not use this file except in compliance with the License.8 * You may obtain a copy of the License at9 *10 *    http://www.apache.org/licenses/LICENSE-2.011 *12 * Unless required by applicable law or agreed to in writing,13 * software distributed under the License is distributed on an14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY15 * KIND, either express or implied.  See the License for the16 * specific language governing permissions and limitations17 * under the License.18 */19import expect from '@kbn/expect';20import { FtrProviderContext } from '../../ftr_provider_context';21// tslint:disable-next-line:no-default-export22export default function({ getPageObjects }: FtrProviderContext) {23  const { visualBuilder, timePicker } = getPageObjects([24    'visualBuilder',25    'timePicker',26    'visualize',27  ]);28  describe('visual builder', function describeIndexTests() {29    describe('markdown', () => {30      before(async () => {31        await visualBuilder.resetPage();32        await visualBuilder.clickMarkdown();33        await timePicker.setAbsoluteRange('2015-09-22 06:00:00.000', '2015-09-22 11:00:00.000');34      });35      it('should render subtabs and table variables markdown components', async () => {36        const tabs = await visualBuilder.getSubTabs();37        expect(tabs).to.have.length(3);38        const variables = await visualBuilder.getMarkdownTableVariables();39        expect(variables).not.to.be.empty();40        expect(variables).to.have.length(5);41      });42      it('should allow printing raw timestamp of data', async () => {43        await visualBuilder.enterMarkdown('{{ count.data.raw.[0].[0] }}');44        const text = await visualBuilder.getMarkdownText();45        expect(text).to.be('1442901600000');46      });47      it('should allow printing raw value of data', async () => {48        await visualBuilder.enterMarkdown('{{ count.data.raw.[0].[1] }}');49        const text = await visualBuilder.getMarkdownText();50        expect(text).to.be('6');51      });52      it('should render html as plain text', async () => {53        const html = '<h1>hello world</h1>';54        await visualBuilder.enterMarkdown(html);55        const markdownText = await visualBuilder.getMarkdownText();56        expect(markdownText).to.be(html);57      });58      it('should render mustache list', async () => {59        const list = '{{#each _all}}\n{{ data.formatted.[0] }} {{ data.raw.[0] }}\n{{/each}}';60        const expectedRenderer = 'Sep 22, 2015 @ 06:00:00.000,6 1442901600000,6';61        await visualBuilder.enterMarkdown(list);62        const markdownText = await visualBuilder.getMarkdownText();63        expect(markdownText).to.be(expectedRenderer);64      });65    });66  });...

autoDetectRenderer.test.ts

Source:autoDetectRenderer.test.ts

1/* eslint-disable @typescript-eslint/no-var-requires */2import { ReactHooksRenderer } from '../types/react'3describe('auto-detect renderer', () => {4  function setUpDependencies({5    reactTestRenderer,6    reactDom7  }: {8    reactTestRenderer?: boolean9    reactDom?: boolean10  }) {11    jest.resetModules()12    jest.unmock('react-test-renderer')13    jest.unmock('react-dom')14    if (!reactTestRenderer) {15      jest.doMock('react-test-renderer', () => require('missing-dependency'))16    }17    if (!reactDom) {18      jest.doMock('react-dom', () => require('missing-dependency'))19    }20  }21  runForLazyRenderers(['default', 'default/pure'], (getRenderer, rendererName) => {22    describe('react-test-renderer available', () => {23      setUpDependencies({ reactTestRenderer: true, reactDom: true })24      const actualRenderer = getRenderer()25      const expectedRenderer = require(rendererName.includes('pure')26        ? '../native/pure'27        : '../native') as ReactHooksRenderer28      test('should resolve native renderer as default renderer', () => {29        expect(actualRenderer).toEqual(expectedRenderer)30      })31    })32    describe('react-dom available', () => {33      setUpDependencies({ reactTestRenderer: false, reactDom: true })34      const actualRenderer = getRenderer()35      const expectedRenderer = require(rendererName.includes('pure')36        ? '../dom/pure'37        : '../dom') as ReactHooksRenderer38      test('should resolve dom renderer as default renderer', () => {39        expect(actualRenderer).toEqual(expectedRenderer)40      })41    })42    describe('no renderers available', () => {43      setUpDependencies({ reactTestRenderer: false, reactDom: false })44      test('should throw error if a default renderer cannot be resolved', () => {45        jest.doMock('react-test-renderer', () => {46          throw new Error('missing dependency')47        })48        jest.doMock('react-dom', () => {49          throw new Error('missing dependency')50        })51        const expectedMessage =52          "Could not auto-detect a React renderer. Are you sure you've installed one of the following\n  - react-dom\n  - react-test-renderer\nIf you are using a bundler, please update your imports to use a specific renderer.\nFor instructions see: https://react-hooks-testing-library.com/installation#being-specific"53        expect(() => getRenderer()).toThrowError(new Error(expectedMessage))54      })55    })56  })...

Using AI Code Generation

1import { renderHook } from '@testing-library/react-hooks';2import { useCounter } from './useCounter';3describe('useCounter', () => {4  it('should increment counter', () => {5    const { result } = renderHook(() => useCounter());6    expect(result.current.count).toBe(0);7    act(() => {8      result.current.increment();9    });10    expect(result.current.count).toBe(1);11    act(() => {12      result.current.decrement();13    });14    expect(result.current.count).toBe(0);15  });16});17import { useState } from 'react';18export const useCounter = () => {19  const [count, setCount] = useState(0);20  const increment = () => {21    setCount(prevCount => prevCount + 1);22  };23  const decrement = () => {24    setCount(prevCount => prevCount - 1);25  };26  return { count, increment, decrement };27};28import React from 'react';29import { useCounter } from './useCounter';30export const App = () => {31  const { count, increment, decrement } = useCounter();32  return (33      <div data-testid="count">{count}</div>34      <button data-testid="increment" onClick={increment}>35      <button data-testid="decrement" onClick={decrement}>36  );37};38import React from 'react';39import { render, screen } from '@testing-library/react';40import { App } from './App';41describe('App', () => {42  it('should render initial count', () => {43    render(<App />);44    expect(screen.getByTestId('count')).toHaveTextContent('0');45    fireEvent.click(screen.getByTestId('increment'));46    expect(screen.getByTestId('count')).toHaveTextContent('1');47    fireEvent.click(screen.getByTestId('decrement'));48    expect(screen.getByTestId('count')).toHaveTextContent('0');49  });50});

Using AI Code Generation

1import { renderHook } from '@testing-library/react-hooks';2import { useCounter } from './useCounter';3describe('useCounter', () => {4  it('should increment the counter', () => {5    const { result } = renderHook(() => useCounter());6    expect(result.current.count).toBe(0);7    act(() => {8      result.current.increment();9    });10    expect(result.current.count).toBe(1);11  });12});13import { renderHook } from '@testing-library/react-hooks';14import { useCounter } from './useCounter';15describe('useCounter', () => {16  it('should increment the counter', () => {17    const { result } = renderHook(() => useCounter());18    expect(result.current.count).toBe(0);19    act(() => {20      result.current.increment();21    });22    expect(result.current.count).toBe(1);23  });24});25import { useState, useCallback } from 'react';26export const useCounter = () => {27  const [count, setCount] = useState(0);28  const increment = useCallback(() => setCount(c => c + 1), []);29  return { count, increment };30};31import { renderHook } from '@testing-library/react-hooks';32import { useCounter } from './useCounter';33jest.mock('react', () => ({34  ...jest.requireActual('react'),35  useReducer: jest.fn()36}));37describe('useCounter', () => {38  it('should increment the counter', () => {39    const { result } = renderHook(() => useCounter());40    expect(result.current.count).toBe(0);41    act(() => {42      result.current.increment();43    });44    expect(result.current.count).toBe(1);45  });46});

Using AI Code Generation

1import { renderHook } from '@testing-library/react-hooks'2import { useCounter } from './useCounter'3describe('useCounter', () => {4  it('should increment the count', () => {5    const { result } = renderHook(() => useCounter())6    expect(result.current.count).toBe(0)7    act(() => {8      result.current.increment()9    })10    expect(result.current.count).toBe(1)11  })12  it('should decrement the count', () => {13    const { result } = renderHook(() => useCounter())14    expect(result.current.count).toBe(0)15    act(() => {16      result.current.decrement()17    })18    expect(result.current.count).toBe(-1)19  })20})21export function useCounter() {22  const [count, setCount] = useState(0)23  const increment = () => setCount(count + 1)24  const decrement = () => setCount(count - 1)25  return {26  }27}28import { renderHook } from '@testing-library/react-hooks'29import { useCounter } from './useCounter'30describe('useCounter', () => {31  it('should increment the count', () => {32    const { result } = renderHook(() => useCounter())33    expect(result.current.count).toBe(0)34    act(() => {35      result.current.increment()36    })37    expect(result.current.count

Using AI Code Generation

1import { renderHook } from '@testing-library/react-hooks';2import { useCounter } from './useCounter';3describe('useCounter', () => {4  it('should use the default value', () => {5    const { result } = renderHook(() => useCounter());6    expect(result.current.count).toBe(0);7  });8  it('should increment the counter', () => {9    const { result } = renderHook(() => useCounter());10    result.current.increment();11    expect(result.current.count).toBe(1);12  });13  it('should decrement the counter', () => {14    const { result } = renderHook(() => useCounter());15    result.current.decrement();16    expect(result.current.count).toBe(-1);17  });18  it('should increment the counter by the specified amount', () => {19    const { result } = renderHook(() => useCounter());20    result.current.incrementBy(2);21    expect(result.current.count).toBe(2);22  });23  it('should decrement the counter by the specified amount', () => {24    const { result } = renderHook(() => useCounter());25    result.current.decrementBy(2);26    expect(result.current.count).toBe(-2);27  });28});29import { useState } from 'react';30export const useCounter = (initialValue = 0) => {31  const [count, setCount] = useState(initialValue);32  const increment = () => setCount(count + 1);33  const decrement = () => setCount(count - 1);34  const incrementBy = (amount) => setCount(count + amount);35  const decrementBy = (amount) => setCount(count - amount);36  return {37  };38};39import React from 'react';40import { useCounter } from './useCounter';41function App() {42  const { count, increment, decrement, incrementBy, decrementBy } = useCounter();43  return (44      <h1>Count: {count}</h1>45      <button onClick={increment}>Increment</button>46      <button onClick={decrement}>Decrement</button>47      <button onClick={() => incrementBy(5)}>Increment by 5</button>48      <button onClick={() => decrementBy(5)}>Decrement by 5</button>

Using AI Code Generation

1import { renderHook } from '@testing-library/react-hooks'2import { useFetch } from './useFetch'3const { data, loading, error } = result.current4console.log(data, loading, error)5import { renderHook } from '@testing-library/react-hooks'6import { useFetch } from './useFetch'7const { result, waitForNextUpdate } = renderHook(() =>8const { data, loading, error } = result.current9console.log(data, loading, error)10await waitForNextUpdate()11import { renderHook } from '@testing-library/react-hooks'12import { useFetch } from './useFetch'13const { result, waitForNextUpdate } = renderHook(() =>14const { data, loading, error } = result.current15console.log(data, loading, error)16await waitForNextUpdate({ timeout: 2000 })17import { renderHook } from '@testing-library/react-hooks'18import { useFetch } from './useFetch'19const { result, waitForNextUpdate } = renderHook(() =>20const { data, loading, error } = result.current21console.log(data, loading, error)22await waitForNextUpdate({ timeout: 2000 })23await waitForNextUpdate({ timeout: 2000 })24import { renderHook } from '@testing-library/react-hooks'25import { useFetch } from './useFetch'26const { result, waitForNextUpdate } = renderHook(() =>27const { data, loading, error } = result.current28console.log(data, loading, error)29await waitForNextUpdate({ timeout: 2000 })30await waitForNextUpdate({ timeout: 2000 })31await waitForNextUpdate({ timeout: 2000 })

Using AI Code Generation

1import {renderHook, act} from '@testing-library/react-hooks'2import {useCounter} from '../useCounter'3test('useCounter', () => {4  const {result} = renderHook(() => useCounter())5  expect(count).toBe(0)6  act(() => inc())7  expect(count).toBe(1)8  act(() => dec())9  expect(count).toBe(0)10})11import {useState} from 'react'12export function useCounter() {13  const [count, setCount] = useState(0)14  const inc = () => setCount(c => c + 1)15  const dec = () => setCount(c => c - 1)16}17import React from 'react'18import {useCounter} from './useCounter'19function App() {20  const [count, inc, dec] = useCounter()21  return (22      <h1>{count}</h1>23      <button onClick={inc}>Increment</button>24      <button onClick={dec}>Decrement</button>25}

Using AI Code Generation

1import { renderHook } from '@testing-library/react-hooks';2import { useFetch } from './useFetch';3describe('useFetch', () => {4  it('should return data', async () => {5    const { result, waitForNextUpdate } = renderHook(() =>6    );7    await waitForNextUpdate();8    expect(result.current.data).toEqual({9    });10  });11});12import { useState, useEffect } from 'react';13export const useFetch = (url) => {14  const [data, setData] = useState(null);15  const [error, setError] = useState(null);16  useEffect(() => {17    const fetchData = async () => {18      try {19        const response = await fetch(url);20        const json = await response.json();21        setData(json);22      } catch (error) {23        setError(error);24      }25    };26    fetchData();27  }, [url]);28  return { data, error };29};

Using AI Code Generation

1import { renderHook } from '@testing-library/react-hooks';2import { useCounter } from './useCounter';3describe('useCounter', () => {4  test('should increment the counter', () => {5    const { result } = renderHook(() => useCounter());6    const { increment } = result.current;7    act(() => {8      increment();9    });10    const { count } = result.current;11    expect(count).toBe(1);12  });13});14import { useState } from 'react';15export const useCounter = () => {16  const [count, setCount] = useState(0);17  const increment = () => {18    setCount(count + 1);19  };20  return { count, increment };21};22import React from 'react';23import { useCounter } from './useCounter';24export const App = () => {25  const { count, increment } = useCounter();26  return (27      <p>Count: {count}</p>28      <button onClick={increment}>Increment</button>29  );30};31import React from 'react';32import ReactDOM from 'react-dom';33import { App } from './App';34ReactDOM.render(<App />, document.getElementById('root'));35{36  "dependencies": {37  },38  "scripts": {39  },40  "eslintConfig": {41  },42  "browserslist": {

Using AI Code Generation

1const { expectedRenderer } = require('./test2');2const { renderHook } = require('@testing-library/react-hooks');3describe('testing-library-react-hooks', () => {4  it('should render', () => {5    const { result } = renderHook(() => expectedRenderer());6    expect(result.current).toEqual('Hello World');7  });8});9const { useMyHook } = require('./test3');10const { act, renderHook } = require('@testing-library/react-hooks');11describe('testing-library-react-hooks', () => {12  it('should render', () => {13    const { result } = renderHook(() => useMyHook());14    expect(result.current).toEqual('Hello World');15  });16});17const { useMyHook } = require('./test4');18const { act, renderHook } = require('@testing-library/react-hooks');19describe('testing-library-react-hooks', () => {20  it('should render', () => {21    const { result } = renderHook(() => useMyHook());22    expect(result.current).toEqual('Hello World');23  });24});25const { useMyHook } = require('./test5');26const { act, renderHook } = require('@testing-library/react-hooks');27describe('testing-library-react-hooks', () => {28  it('should render', () => {29    const { result } = renderHook(() => useMyHook());30    expect(result.current).toEqual('Hello World');31  });32});33const { useMyHook } = require('./test6');34const { act, renderHook } = require('@testing-library/react-hooks');35describe('testing-library-react-hooks', () => {36  it('should render', () => {37    const { result } = renderHook(() => useMyHook());38    expect(result.current).toEqual('Hello World');39  });40});41const { useMyHook } = require('./test7');42const { act, renderHook } = require('@testing-library/react-hooks');43describe('testing-library-react-hooks

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.