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
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