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

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

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

tetris.js

Source:tetris.js

...140        this.minos = this.minos.slice(1);141        if (this.minoCollides(this.mino)) {142            this.gameOver = true;143        }144        this.rerenderHook();145    }146    // returns whether a potential position would collide into the board147    minoCollides(mino) {148        return flattenMino(mino)149            .some(([x, y]) =>150                !inBounds(x, 0, 10) || y >= 20 || this.getPos([x, y]) !== null151            );152    }153    placeMino(mino) {154        // put mino on board155        for (const pos of flattenMino(this.mino)) {156            this.setPos(pos, this.mino.index);157        }158        // check for rows to be removed159        for (let i = this.board.length - 1; i >= 0; ) {160            const row = this.board[i];161            if (row.every(item => item !== null))  {162                // remove full rows163                for (let j = i; j > 0; --j) {164                    this.board[j] = this.board[j - 1];165                }166                this.board[0] = Array(10).fill(null);167            } else {168                --i;169            }170        }171    }172    rotateMino(isClockwise) {173        // multiplier for 90 deg. rotation174        const [mx, my] = isClockwise ? [-1, 1] : [1, -1];175        const rotated = copyMino(this.mino);176        rotated.shape = rotated.shape.map(([x, y]) => [y * mx, x * my]);177        if (!this.minoCollides(rotated)) {178            this.mino = rotated;179        }180        this.rerenderHook();181    }182    moveMino(dir) {183        const moved = copyMino(this.mino);184        moved.pos[0] += dir[0];185        moved.pos[1] += dir[1];186        if (!this.minoCollides(moved)) {187            this.mino = moved;188        }189        this.rerenderHook();190    }191    dropMino() {192        const dropped = copyMino(this.mino);193        dropped.pos[1] += 1;194        if (!this.minoCollides(dropped)) {195            this.mino = dropped;196            this.rerenderHook();197        } else {198            this.placeMino();199            this.requestMino();200        }201    }202    fastDropMino() {203        const dropped = copyMino(this.mino);204        do {205            dropped.pos[1] += 1;206        } while (!this.minoCollides(dropped));207        dropped.pos[1] -= 1;208        this.mino = dropped;209        this.placeMino();210        this.requestMino();...

usePropsThatChanged.test.js

Source:usePropsThatChanged.test.js

...9      initialProps: props,10    });11    const propsThatChanged = { key3: NEXT_MOCK_VALUE, key4: [NEXT_MOCK_VALUE] };12    const newComponentProps = { ...props, ...propsThatChanged };13    rerenderHook(newComponentProps);14    expect(result.current).toStrictEqual(propsThatChanged);15  });16  it('should return an empty object if no props changed', () => {17    const props = { key1: MOCK_VALUE, key2: { value: MOCK_VALUE }, key3: MOCK_VALUE, key4: [MOCK_VALUE] };18    const { result, rerender: rerenderHook } = renderHook((nextProps) => usePropsThatChanged(nextProps), {19      initialProps: props,20    });21    const newComponentProps = { ...props };22    rerenderHook(newComponentProps);23    expect(result.current).toStrictEqual({});24  });...

testHook.ts

Source:testHook.ts

...17      rerenderHook = rerender;18      firstCall = false;19      extra.waitForNextUpdate = waitForNextUpdate;20    } else {21      rerenderHook(args);22    }23    return hookResult.current;24  };25  return [useHook as T, extra] as const;...

Using AI Code Generation

1import { renderHook, act } from '@testing-library/react-hooks'2import { useCounter } from './useCounter'3test('should increment counter', () => {4  const { result } = renderHook(() => useCounter())5  act(() => result.current.increment())6  expect(result.current.count).toBe(1)7})8import { useState } from 'react'9export const useCounter = () => {10  const [count, setCount] = useState(0)11  const increment = () => setCount(count + 1)12  return { count, increment }13}

Using AI Code Generation

1import { act, renderHook } from '@testing-library/react-hooks';2import useCounter from './useCounter';3describe('useCounter', () => {4  it('should increment counter', () => {5    const { result } = renderHook(() => useCounter());6    act(() => {7      result.current.increment();8    });9    expect(result.current.count).toBe(1);10  });11  it('should decrement counter', () => {12    const { result } = renderHook(() => useCounter());13    act(() => {14      result.current.decrement();15    });16    expect(result.current.count).toBe(-1);17  });18  it('should reset counter', () => {19    const { result, rerender } = renderHook(() => useCounter());20    act(() => {21      result.current.increment();22    });23    rerender();24    act(() => {25      result.current.reset();26    });27    expect(result.current.count).toBe(0);28  });29});30import { useState } from 'react';31const useCounter = () => {32  const [count, setCount] = useState(0);33  const increment = () => setCount((prevCount) => prevCount + 1);34  const decrement = () => setCount((prevCount) => prevCount - 1);35  const reset = () => setCount(0);36  return { count, increment, decrement, reset };37};38export default useCounter;39import React from 'react';40import useCounter from './useCounter';41const App = () => {42  const { count, increment, decrement, reset } = useCounter();43  return (44      <h1>Counter: {count}</h1>45      <button onClick={increment}>Increment</button>46      <button onClick={decrement}>Decrement</button>47      <button onClick={reset}>Reset</button>48  );49};50export default App;

Using AI Code Generation

1import { renderHook, act } from "@testing-library/react-hooks";2import useCounter from "./useCounter";3export const testHook = (initialProps) => {4  const { result } = renderHook(() => useCounter(initialProps));5  return result.current;6};7import { testHook } from "./useCounter.test";8import { testHook } from "./useCounter.test";9import { testHook } from "./useCounter.test";10import { testHook } from "./useCounter.test";11const { count, increment, decrement } = testHook({ initialCount: 0 });12test("should return the count", () => {13  expect(count).toBe(0);14});15test("should increment the count", () => {16  act(() => {17    increment();

Using AI Code Generation

1import { act } from 'react-dom/test-utils';2import { renderHook } from '@testing-library/react-hooks';3test('rerenderHook', () => {4  const { result, rerender } = renderHook(() => useCounter());5  expect(result.current.count).toBe(0);6  act(() => {7    result.current.increment();8  });9  expect(result.current.count).toBe(1);10  rerender();11  expect(result.current.count).toBe(1);12});13test('rerender', () => {14  const { result, rerender } = renderHook(() => useCounter());15  expect(result.current.count).toBe(0);16  act(() => {17    result.current.increment();18  });19  expect(result.current.count).toBe(1);20  rerender();21  expect(result.current.count).toBe(1);22});23import { act } from 'react-dom/test-utils';24import { renderHook } from '@testing-library/react-hooks';25test('rerenderHook', () => {26  const { result, rerender } = renderHook(() => useCounter());27  expect(result.current.count).toBe(0);28  act(() => {29    result.current.increment();30  });31  expect(result.current.count).toBe(1);32  rerender();33  expect(result.current.count).toBe(1);34});35test('rerender', () => {36  const { result, rerender } = renderHook(() => useCounter());37  expect(result.current.count).toBe(0);38  act(() => {39    result.current.increment();40  });41  expect(result.current.count).toBe(1);42  rerender();43  expect(result.current.count).toBe(1);44});45import { act } from 'react-dom/test-utils';46import { renderHook } from '@testing-library/react-hooks';47test('rerenderHook', () => {48  const { result, rerender } = renderHook(() => useCounter());49  expect(result.current.count).toBe(0

Using AI Code Generation

1import { renderHook, act } from '@testing-library/react-hooks';2import { useSearch } from './useSearch';3test('useSearch', () => {4  const { result, rerender } = renderHook(() => useSearch());5  const { search, setSearch } = result.current;6  expect(search).toBe('');7  act(() => {8    setSearch('test1');9  });10  expect(result.current.search).toBe('test1');11});12import { useState } from 'react';13export const useSearch = () => {14  const [search, setSearch] = useState('');15  return {16  };17};

Using AI Code Generation

1import { renderHook } from '@testing-library/react-hooks';2import useCounter from './useCounter';3test('should increment counter', () => {4  const { result } = renderHook(() => useCounter());5  const { increment } = result.current;6  act(() => {7    increment();8  });9  const { count } = result.current;10  expect(count).toBe(1);11});12import { useState } from 'react';13export default function useCounter() {14  const [count, setCount] = useState(0);15  const increment = () => {16    setCount(count + 1);17  };18  return { count, increment };19}

Using AI Code Generation

1import { renderHook, act } from '@testing-library/react-hooks'2import useCounter from './useCounter'3test('should increment counter', () => {4  const { result } = renderHook(() => useCounter())5  act(() => {6    result.current.increment()7  })8  expect(result.current.count).toBe(1)9})10test('should decrement counter', () => {11  const { result } = renderHook(() => useCounter())12  act(() => {13    result.current.decrement()14  })15  expect(result.current.count).toBe(-1)16})17test('should reset counter', () => {18  const { result } = renderHook(() => useCounter())19  act(() => {20    result.current.increment()21    result.current.reset()22  })23  expect(result.current.count).toBe(0)24})25test('should set counter', () => {26  const { result } = renderHook(() => useCounter())27  act(() => {28    result.current.set(5)29  })30  expect(result.current.count).toBe(5)31})32import { useState } from 'react'33const useCounter = () => {34  const [count, setCount] = useState(0)35  const increment = () => setCount(count + 1)36  const decrement = () => setCount(count - 1)37  const reset = () => setCount(0)38  const set = (n) => setCount(n)39  return { count, increment, decrement, reset, set }40}41import React from 'react'42import useCounter from './useCounter'43const App = () => {44  const { count, increment, decrement, reset, set } = useCounter()45  return (46      <h1>{count}</h1>47      <button onClick={increment}>+</button>48      <button onClick={decrement}>-</button>49      <button onClick={reset}>Reset</button>50      <button onClick={() => set(10)}>Set 10</button>51}52import React from 'react'53import ReactDOM from 'react-dom'54import App from './App'55ReactDOM.render(<App />, document.getElementById('root'))56import { render, screen } from

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.