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How to use renderHook method in testing-library-react-hooks
Best JavaScript code snippet using testing-library-react-hooks
useMetamask.test.js
Source:useMetamask.test.js 
...50 modifyListener();51 });52 afterAll(() => cleanup())53 test("isConnected should be false", () => {54 const { result } = renderHook(() => useMetamask(), { wrapper });55 expect(result.current.metaState.isConnected).toBe(false);56 });57 test("should connect", async () => {58 const { result } = renderHook(() => useMetamask(), { wrapper });59 await act(async () => {60 await result.current.connect(Web3Interface);61 });62 expect(result.current.metaState.isConnected).toBe(true);63 });64 test("should return address", async () => {65 const { result } = renderHook(() => useMetamask(), { wrapper });66 await act(async () => {67 await result.current.connect(Web3Interface);68 });69 expect(result.current.metaState.account).toContain("0xSomething");70 });71 test("should return chainId", async () => {72 const { result } = renderHook(() => useMetamask(), { wrapper });73 await act(async () => {74 await result.current.connect(Web3Interface);75 });76 expect(result.current.metaState.chain.id).toBe("1");77 });78 test("should return local chainId", async () => {79 modifyListener(1000000000);80 const { result } = renderHook(() => useMetamask(), { wrapper });81 await act(async () => {82 await result.current.connect(Web3Interface);83 });84 expect(result.current.metaState.chain.id).toBe("1000000000");85 });86 test("should return ropsten chainName", async () => {87 modifyListener(3);88 const { result } = renderHook(() => useMetamask(), { wrapper });89 await act(async () => {90 await result.current.connect(Web3Interface);91 });92 expect(result.current.metaState.chain.name).toBe("ropsten");93 });94 test("should return rinkeby chainName", async () => {95 modifyListener(4);96 const { result } = renderHook(() => useMetamask(), { wrapper });97 await act(async () => {98 await result.current.connect(Web3Interface);99 });100 expect(result.current.metaState.chain.name).toBe("rinkeby");101 });102 test("should return goerli chainName", async () => {103 modifyListener(5);104 const { result } = renderHook(() => useMetamask(), { wrapper });105 await act(async () => {106 await result.current.connect(Web3Interface);107 });108 expect(result.current.metaState.chain.name).toBe("goerli");109 });110 test("should return kovan chainName", async () => {111 modifyListener(42);112 const { result } = renderHook(() => useMetamask(), { wrapper });113 await act(async () => {114 await result.current.connect(Web3Interface);115 });116 expect(result.current.metaState.chain.name).toBe("kovan");117 });118 test("should return unknown chainName", async () => {119 modifyListener(999);120 const { result } = renderHook(() => useMetamask(), { wrapper });121 await act(async () => {122 await result.current.connect(Web3Interface);123 });124 expect(result.current.metaState.chain.name).toBe("unknown");125 });126 test("should not change any state, if action type is unknown", async () => {127 const { result } = renderHook(() => useMetamask(), { wrapper });128 await act(async () => {129 await result.current.connect(Web3Interface);130 });131 expect(result.current.metaState.chain.id).toBe("1");132 });133 test("should throw error on getNetwork", async () => {134 modifyRequest(Error("unexpected error"));135 const { result } = renderHook(() => useMetamask(), { wrapper });136 await act(async () => {137 try {138 await result.current.connect(Web3Interface);139 } catch (error) {140 expect(error.message).toEqual("Error: unexpected error");141 }142 });143 });144 test("should throw error on getAccount", async () => {145 modifyRequest(1, Error("unexpected error"));146 const { result } = renderHook(() => useMetamask(), { wrapper });147 await act(async () => {148 try {149 await result.current.connect(Web3Interface);150 } catch (error) {151 expect(error.message).toEqual("Error: unexpected error");152 }153 });154 });155 test("should throw error for missing Web3Interface", async () => {156 const { result } = renderHook(() => useMetamask(), { wrapper });157 await act(async () => {158 try {159 await result.current.connect();160 } catch (error) {161 expect(error.message).toEqual(162 "Web3 Provider is required. You can use either ethers.js or web3.js."163 );164 }165 });166 });167 test("should be able to accept web3Interface options", async () => {168 const { result } = renderHook(() => useMetamask(), { wrapper });169 await act(async () => {170 await result.current.connect(Web3Interface, { test: "" });171 expect(result.current.metaState.isConnected).toBe(true);172 });173 });174 test("should not connect if there is no account available", async () => {175 modifyRequest(1, []);176 modifyListener(1, []);177 const { result } = renderHook(() => useMetamask(), { wrapper });178 await act(async () => {179 await result.current.connect(Web3Interface);180 expect(result.current.metaState.isConnected).toBe(false);181 });182 });183 test("should change connect status if account disconnected", async () => {184 modifyRequest(1, ["0xSomething"]);185 modifyListener(1, []);186 const { result } = renderHook(() => useMetamask(), { wrapper });187 await act(async () => {188 await result.current.connect(Web3Interface);189 expect(result.current.metaState.isConnected).toBe(false);190 });191 });192 test("should raise warning if given action is null/undefined", async () => {193 // store.js194 Object.defineProperty(typeStateMap, "SET_ACCOUNT", {195 get: jest.fn(() => null),196 });197 const { result } = renderHook(() => useMetamask(), { wrapper });198 await act(async () => {199 await result.current.connect(Web3Interface);200 expect(result.current.metaState.isConnected).toBe(true);201 });202 });203 test("should raise error if connect method re-called before the one resolved", async () => {204 const { result } = renderHook(() => useMetamask(), { wrapper });205 await act(async () => {206 try {207 result.current.connect(Web3Interface);208 await result.current.connect(Web3Interface);209 } catch (error) {210 expect(error.message).toEqual("Connect method already called.");211 }212 });213 });214 test("should raise an error if component unmounted earlier", async () => {215 jest.spyOn(React, "useRef").mockReturnValue({216 current: false,217 });218 const { result } = renderHook(() => useMetamask(), { wrapper });219 await act(async () => {220 try {221 await result.current.connect(Web3Interface);222 } catch (error) {223 expect(error.message).toEqual("Component is not mounted.");224 }225 });226 });227 test("getAccounts should call the account without Metamask permission", async () => {228 const { result } = renderHook(() => useMetamask(), { wrapper });229 await act(async () => {230 await result.current.getAccounts();231 expect(result.current.metaState.isConnected).toBe(true);232 expect(result.current.metaState.account).toEqual(["0xSomethingWithoutPermission"]);233 });234 });235 test("getChain should return current chain information", async () => {236 const { result } = renderHook(() => useMetamask(), { wrapper });237 await act(async () => {238 await result.current.getChain();239 expect(result.current.metaState.chain).toEqual({id: "1", name: "mainnet"});240 });241 });242});243describe("When Metamask is not Available", () => {244 const Web3Interface = jest.fn();245 let wrapper;246 247 beforeAll(() => {248 jest.spyOn(console, "warn").mockImplementation(() => {});249 window.ethereum = undefined;250 wrapper = ({ children }) => (251 <MetamaskStateProvider>{children}</MetamaskStateProvider>252 );253 });254 test("isAvailable should be false", () => {255 const { result } = renderHook(() => useMetamask(), { wrapper });256 expect(result.current.metaState.isAvailable).toBe(false);257 });258 test("should raise error when connect", async () => {259 const { result } = renderHook(() => useMetamask(), { wrapper });260 await act(async () => {261 try {262 await result.current.connect(Web3Interface);263 } catch (error) {264 expect(error.message).toEqual("Metamask is not available.");265 }266 });267 });268 test("getAccounts should return with a warning", async () => {269 const { result } = renderHook(() => useMetamask(), { wrapper });270 await act(async () => {271 await result.current.getAccounts();272 expect(result.current.metaState.account).toEqual([]);273 });274 });275 test("getChain should return empty chain information", async () => {276 const { result } = renderHook(() => useMetamask(), { wrapper });277 await act(async () => {278 await result.current.getChain();279 expect(result.current.metaState.chain).toEqual({id: null, name: ""});280 });281 });...
useForm.spec.js
Source:useForm.spec.js
...5 it('should be a function', () => {6 expect(typeof useForm).toBe('function');7 });8 it('should require the `validations` option', () => {9 renderHook(() => {10 expect(() => {11 useForm({});12 }).toThrow('the option `validations` is required');13 });14 });15 it('should require the validation option to be an object', () => {16 renderHook(() => {17 expect(() => {18 useForm({19 validations: true,20 });21 }).toThrow('the option `validations` should be an object');22 });23 });24 });25 describe('validateField', () => {26 describe('required', () => {27 it("should return a default error message for fields that don't have a value", () => {28 const { result } = renderHook(() => useForm({29 validations: {30 name: {31 required: true,32 },33 },34 }));35 expect(result.current.validateField('name', '')).toBe('required');36 });37 it('should return a custom error message', () => {38 const { result } = renderHook(() => useForm({39 validations: {40 name: {41 required: 'the field "name" is required',42 },43 },44 }));45 expect(result.current.validateField('name', '')).toBe('the field "name" is required');46 });47 });48 describe('pattern', () => {49 it('should return an error message if the value does not satisfy the pattern', () => {50 const { result } = renderHook(() => useForm({51 validations: {52 email: {53 pattern: {54 value: /\w+@\w+\.com/gi,55 },56 },57 },58 }));59 expect(result.current.validateField('email', '')).toBe('invalid');60 });61 it('should return an custom error message if the message attribute exists', () => {62 const { result } = renderHook(() => useForm({63 validations: {64 email: {65 pattern: {66 value: /\w+@\w+\.com/gi,67 message: 'Invalid e-mail',68 },69 },70 },71 }));72 expect(result.current.validateField('email', '')).toBe('Invalid e-mail');73 });74 });75 describe('validate', () => {76 let validateMock;77 let hook;78 beforeEach(() => {79 validateMock = jest.fn((value) => {80 if (Number(value) < 18) {81 return 'You are not able to get a drive permission';82 }83 return '';84 });85 const { result } = renderHook(() => useForm({86 validations: {87 age: {88 validate: validateMock,89 },90 },91 }));92 hook = result.current;93 });94 it('should execute the validate function passing the field value', () => {95 hook.validateField('age', '10');96 expect(validateMock).toHaveBeenCalledWith('10');97 });98 it('should be executed and return a string', () => {99 hook.validateField('age', '10');100 expect(validateMock).toHaveBeenCalled();101 expect(typeof validateMock.mock.results[0].value).toBe('string');102 });103 it('should return an error message', () => {104 hook.validateField('age', '10');105 expect(validateMock.mock.results[0].value).toBe('You are not able to get a drive permission');106 });107 it('should return an empty string when value is valid', () => {108 hook.validateField('age', '20');109 expect(validateMock.mock.results[0].value).toBe('');110 });111 });112 });113 describe('bindField', () => {114 it('should validate the name parameter', () => {115 const { result } = renderHook(() => useForm({116 validations: {117 name: {118 required: true,119 }120 }121 }));122 expect(() => {123 result.current.bindField();124 }).toThrow('The field name parameter is required');125 expect(() => {126 result.current.bindField(1);127 }).toThrow('The field name should be a string');128 });129 it('should return an object with value and onChange attributes', () => {130 const { result } = renderHook(() => useForm({131 validations: {132 name: {133 required: true,134 }135 }136 }));137 expect(result.current.bindField('name')).toEqual({138 value: expect.any(String),139 onChange: expect.any(Function),140 });141 });142 describe('onChange', () => {143 it('should update the Hook state when called', () => {144 const { result } = renderHook(() => useForm({145 validations: {146 name: {147 required: true,148 },149 },150 }));151 const bindFieldResult = result.current.bindField('name');152 act(() => {153 bindFieldResult.onChange({ target: { value: 'John' } });154 });155 expect(result.current.values.name).toBe('John');156 expect(result.current.errors.name).toBe('');157 act(() => {158 bindFieldResult.onChange({ target: { value: '' } });159 });160 expect(result.current.values.name).toBe('');161 expect(result.current.errors.name).toBe('required');162 });163 });164 });165 describe('initialValues', () => {166 it('should trhow an Error if the initialValues is not an object', () => {167 renderHook(() => {168 expect(() => {169 useForm({170 initialValues: true,171 })172 }).toThrow('the option `initialValues` should be an object');173 });174 });175 it('should initialize the values state with the initial values', () => {176 const { result } = renderHook(() => useForm({177 initialValues: {178 name: 'Carlos',179 },180 validations: {},181 }));182 expect(result.current.values.name).toBe('Carlos');183 });184 });185 describe('isValid', () => {186 it('should be a function', () => {187 const { result } = renderHook(() => useForm({188 validations: {},189 }));190 expect(typeof result.current.isValid).toBe('function');191 });192 it('should return false when it finds any error on the form', () => {193 const { result } = renderHook(() => useForm({194 initialValues: {195 name: 'Carlos',196 surname: '',197 },198 validations: {199 name: {200 required: true,201 },202 surname: {203 required: true,204 },205 birthDate: {206 pattern: {207 value: /^\d{2}\/\d{2}\/\d{4}$/gi,208 message: 'invalid date',209 },210 },211 },212 }));213 expect(result.current.isValid()).toBe(false);214 });215 it('should return true if all the form fields are valid', () => {216 const { result } = renderHook(() => useForm({217 initialValues: {218 name: 'Carlos',219 surname: 'Silva',220 birthDate: '28/10/1990',221 },222 validations: {223 name: {224 required: true,225 },226 surname: {227 required: true,228 },229 birthDate: {230 pattern: {...
index.test.js
Source:index.test.js
...8import {renderHook, act} from '@testing-library/react-hooks';9import usePagination, {NO_TOTAL_PAGES_ERROR} from './index';10describe('UsePagination hook', () => {11 it('should exist', () => {12 const {result} = renderHook(() => usePagination({totalPages: 10}));13 expect(result.current).toBeDefined();14 });15 it('should throw if no total pages were given to it', () => {16 expect(() => {17 usePagination();18 }).toThrow(NO_TOTAL_PAGES_ERROR);19 });20 it('should return the totalPages that was given to it', () => {21 const mockTotalPages = 10;22 const {result} = renderHook(() => usePagination({totalPages: mockTotalPages}));23 expect(result.current.totalPages).toEqual(mockTotalPages);24 });25 it('should return 0 as the cursor position if no cursor was given to it', () => {26 const {result} = renderHook(() => usePagination({totalPages: 10}));27 expect(result.current.cursor).toEqual(0);28 });29 it('should return the received cursor position if it was given to it', () => {30 const {result} = renderHook(() => usePagination({totalPages: 10, initialCursor: 5}));31 expect(result.current.cursor).toEqual(5);32 });33 it('should return the hooks methods', () => {34 const {result} = renderHook(() => usePagination({totalPages: 10}));35 expect(typeof result.current.goNext).toEqual('function');36 expect(typeof result.current.goPrev).toEqual('function');37 expect(typeof result.current.setCursor).toEqual('function');38 });39 describe('setCursor method', () => {40 it('should set the hooks cursor to the given value', () => {41 const {result} = renderHook(() => usePagination({totalPages: 10}));42 act(() => {43 result.current.setCursor(4);44 });45 expect(result.current.cursor).toEqual(4);46 });47 it('should not set the hooks cursor if the given value is above the total pages', () => {48 const {result} = renderHook(() => usePagination({totalPages: 10}));49 act(() => {50 result.current.setCursor(15);51 });52 expect(result.current.cursor).toEqual(0);53 });54 it('should not set the hooks cursor if the given value is lower than 0', () => {55 const {result} = renderHook(() => usePagination({totalPages: 10}));56 act(() => {57 result.current.setCursor(-3);58 });59 expect(result.current.cursor).toEqual(0);60 });61 });62 describe('goNext method', () => {63 it('should set the hooks cursor to the next value', () => {64 const {result} = renderHook(() => usePagination({totalPages: 2}));65 act(() => {66 result.current.goNext();67 });68 expect(result.current.cursor).toEqual(1);69 });70 it('should not set the hooks cursor to the next value if we reached the last page', () => {71 const {result} = renderHook(() => usePagination({totalPages: 5, initialCursor: 4}));72 act(() => {73 result.current.goNext();74 });75 expect(result.current.cursor).toEqual(4);76 });77 });78 describe('goPrev method', () => {79 it('should set the hooks cursor to the prev value', () => {80 const {result} = renderHook(() => usePagination({totalPages: 5, initialCursor: 4}));81 act(() => {82 result.current.goPrev();83 });84 expect(result.current.cursor).toEqual(3);85 });86 it('should not set the hooks cursor to the prev value if we reached the first page', () => {87 const {result} = renderHook(() => usePagination({totalPages: 5}));88 act(() => {89 result.current.goPrev();90 });91 expect(result.current.cursor).toEqual(0);92 });93 });94 describe('onChange callback handler', () => {95 it('should be invoked when the cursor changes by setCursor method', () => {96 const onChangeSpy = jest.fn();97 const {result} = renderHook(() => usePagination({totalPages: 5, onChange: onChangeSpy}));98 act(() => {99 result.current.setCursor(3);100 });101 expect(onChangeSpy).toHaveBeenCalledWith(3);102 });103 it('should not be invoked when the hook is initialized', () => {104 const onChangeSpy = jest.fn();105 renderHook(() => usePagination({totalPages: 5, onChange: onChangeSpy}));106 expect(onChangeSpy).not.toHaveBeenCalled();107 });108 });...
Using AI Code Generation
1import { renderHook } from '@testing-library/react-hooks';2import { useFetch } from './useFetch';3test('should fetch data', async () => {4 await waitForNextUpdate();5 expect(result.current.data).toHaveLength(10);6});7import { useState, useEffect } from 'react';8import axios from 'axios';9export const useFetch = (url) => {10 const [data, setData] = useState(null);11 useEffect(() => {12 const fetchData = async () => {13 const response = await axios(url);14 setData(response.data);15 };16 fetchData();17 }, [url]);18 return { data };19};
Using AI Code Generation
1import { renderHook, act } from '@testing-library/react-hooks';2import { useCounter } from '../useCounter';3describe('useCounter', () => {4 it('should increment the counter by 1', () => {5 const { result } = renderHook(() => useCounter());6 act(() => {7 result.current.increment();8 });9 expect(result.current.count).toBe(1);10 });11});12import { useState } from 'react';13export const 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 } from '@testing-library/react-hooks'2import { useCounter } from './useCounter'3describe('useCounter', () => {4 it('should use 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})13export const useCounter = () => {14 const [count, setCount] = useState(0)15 const increment = () => setCount(count + 1)16 return { count, increment }17}18import { useCounter } from './useCounter'19import { renderHook, act } from '@testing-library/react-hooks'20describe('useCounter', () => {21 it('should use the counter', () => {22 const { result } = renderHook(() => useCounter())23 expect(result.current.count).toBe(0)24 act(() => {25 result.current.increment()26 })27 expect(result.current.count).toBe(1)28 })29})30export const useCounter = () => {31 const [count, setCount] = useState(0)32 const increment = () => setCount(count + 1)33 return { count, increment }34}35import { useCounter } from './useCounter'36import { renderHook, act } from '@testing-library/react-hooks'37describe('useCounter', () => {38 it('should use 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})47export const useCounter = () => {48 const [count, setCount] = useState(0)49 const increment = () => setCount(count + 1)50 return { count, increment }51}52import { useCounter } from './useCounter'53import { renderHook, act } from '@testing-library/react-hooks'54describe('useCounter', () => {55 it('should use the counter', () => {56 const { result } = renderHook(() => useCounter())
Using AI Code Generation
1import { renderHook } from '@testing-library/react-hooks';2import { useFetch } from './useFetch';3describe('useFetch', () => {4 it('should return the initial value', () => {5 expect(result.current).toEqual({6 });7 });8});9import { useState, useEffect } from 'react';10export const useFetch = (url) => {11 const [state, setState] = useState({12 });13 useEffect(() => {14 setState({15 });16 fetch(url)17 .then((x) => x.text())18 .then((y) => {19 setState({20 });21 });22 }, [url, setState]);23 return state;24};25import React from 'react';26import { useFetch } from './useFetch';27function App() {28 return (29 {loading ? 'loading...' : data}30 {error ? error : null}31 );32}33export default App;34const express = require('express');35const app = express();36const port = 3001;37app.get('/', (req, res) => {38 res.send('Hello World!');39});40app.listen(port, () => {41});42{43 "dependencies": {
Using AI Code Generation
1import { renderHook, act } from '@testing-library/react-hooks';2import { useCounter } from './useCounter';3test('useCounter', () => {4 const { result } = renderHook(() => useCounter(0));5 expect(result.current.count).toBe(0);6 act(() => {7 result.current.increment();8 });9 expect(result.current.count).toBe(1);10 act(() => {11 result.current.decrement();12 });13 expect(result.current.count).toBe(0);14});15import { useState } from 'react';16export const useCounter = (initialCount) => {17 const [count, setCount] = useState(initialCount);18 const increment = () => {19 setCount(count + 1);20 };21 const decrement = () => {22 setCount(count - 1);23 };24 return { count, increment, decrement };25};26import { renderHook, act } from '@testing-library/react-hooks';27import { useCounter } from './useCounter';28test('useCounter', () => {29 const { result } = renderHook(() => useCounter(0));30 expect(result.current.count).toBe(0);31 act(() => {32 result.current.increment();33 });34 expect(result.current.count).toBe(1);35 act(() => {36 result.current.decrement();37 });38 expect(result.current.count).toBe(0);39});40import { useState } from 'react';41export const useCounter = (initialCount) => {42 const [count, setCount] = useState(initialCount);43 const increment = () => {44 setCount(count + 1);45 };46 const decrement = () => {47 setCount(count - 1);48 };49 return { count, increment, decrement };50};51import { renderHook, act } from '@testing-library/react-hooks';52import { useCounter } from './useCounter';53test('useCounter', () => {54 const { result } = renderHook(() => useCounter(0));55 expect(result.current.count).toBe(0);56 act(() => {57 result.current.increment();58 });59 expect(result.current.count
Using AI Code Generation
1import { renderHook, act } from '@testing-library/react-hooks' 2import { useCounter } from './useCounter'3it('should increment the counter', () => {4 const { result } = renderHook(() => useCounter())5 act(() => {6 result.current.increment()7 })8 expect(result.current.count).toBe(1)9})10import { useState } from 'react'11export const useCounter = () => {12 const [count, setCount] = useState(0)13 const increment = () => setCount(count + 1)14 return {15 }16}
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