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

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

request-resolver.spec.ts

Source:request-resolver.spec.ts

1import {assert, use} from "chai";2import * as sinonChai from "sinon-chai";3import {spy, assert as assertSpy} from "sinon";4import {IResolvedRoute} from "../interfaces/iroute";5import {Methods, Router} from "../router/router";6import {uuid} from "../core";7import {EventEmitter} from "events";8import {Injector} from "../injector/injector";9import {HttpRequestResolver, RenderType} from "../server/request-resolver";10import {parse} from "url";11import {Logger} from "../logger/logger";12import {IResolvedModule, IModule} from "../interfaces/imodule";13import {Module} from "../decorators/module";14import {Controller} from "../decorators/controller";15import {Action} from "../decorators/action";16import {createModule, getModule} from "../server/bootstrap";17import {IProvider, IAfterConstruct} from "../interfaces/iprovider";18import {Metadata} from "../injector/metadata";19import {Inject} from "../decorators/inject";20import {setTimeout} from "timers";21// use chai spies22use(sinonChai);23describe("HttpRequestResolver", () => {24  let resolvedRoute: IResolvedRoute;25  let routeResolver: HttpRequestResolver;26  let request, response, data, id = uuid();27  beforeEach(() => {28    resolvedRoute = {29      method: Methods.GET,30      params: {31        a: 1,32        b: 233      },34      route: "core/index"35    };36    class ResponseEmitter extends EventEmitter {37      writeHead() {38      }39      write() {40      }41      end() {42      }43      invalid() {44        return 1;45      }46    }47    response = new ResponseEmitter();48    request = new ResponseEmitter();49    data = [new Buffer(1), new Buffer(1)];50    let injector = Injector.createAndResolveChild(51      new Injector(),52      HttpRequestResolver,53      [54        Logger,55        Router,56        {provide: "url", useValue: parse("/", true)},57        {provide: "UUID", useValue: id},58        {provide: "data", useValue: data},59        {provide: "contentType", useValue: "text/html"},60        {provide: "statusCode", useValue: 200},61        {provide: "request", useValue: request},62        {provide: "response", useValue: response},63        {provide: "modules", useValue: []},64        EventEmitter65      ]66    );67    routeResolver = injector.get(HttpRequestResolver);68  });69  it("Should initialize", () => {70    assert.isNotNull(routeResolver);71  });72  it("Should render", (done) => {73    let toRender = "RENDER";74    let aSpy = spy(response, "writeHead");75    let a2Spy = spy(response, "write");76    let a3Spy = spy(response, "end");77    let resolve = routeResolver.render(toRender, RenderType.DATA_HANDLER);78    resolve.then(rendered => {79      assertSpy.calledWith(aSpy, 200, {"Content-Type": "text/html"});80      assertSpy.calledWith(a2Spy, toRender);81      assertSpy.called(a3Spy);82      assert.equal(rendered, toRender);83      done();84    }).catch(done);85  });86  it("Should render throws error", (done) => {87    let resolve = routeResolver.render(Reflect.get(response, "invalid").call(), RenderType.DATA_HANDLER);88    resolve.catch(result => {89      assert.equal(result.message, "ResponseType must be string or buffer");90    }).then(done).catch(done);91  });92  it("Should getControllerProvider", () => {93    @Controller({94      name: "core"95    })96    class MyController {97      @Action("index")98      actionIndex() {99      }100    }101    @Module({102      name: "root",103      controllers: [MyController]104    })105    class MyModule {106    }107    let modules: Array<IModule> = createModule(MyModule);108    let module: IResolvedModule = {109      module: getModule(modules),110      endpoint: "core",111      action: "index",112      resolvedRoute,113      data114    };115    let provider = Metadata.verifyProvider(MyController);116    let controllerProvider: IProvider = HttpRequestResolver.getControllerProvider(module);117    assert.deepEqual(provider, controllerProvider);118  });119  it("Should getControllerProvider no route", () => {120    @Controller({121      name: "core"122    })123    class MyController {124      @Action("index")125      actionIndex() {126      }127    }128    @Module({129      name: "root",130      controllers: [MyController]131    })132    class MyModule {133    }134    let modules: Array<IModule> = createModule(MyModule);135    let module: IResolvedModule = {136      module: getModule(modules),137      endpoint: "test",138      action: "index",139      resolvedRoute,140      data141    };142    assert.throws(() => {143      HttpRequestResolver.getControllerProvider(module);144    }, "You must define controller within current route: core/index");145  });146  it("Should processModule", (done) => {147    let value = "MY_VALUE";148    @Controller({149      name: "core"150    })151    class MyController {152      @Action("index")153      actionIndex() {154        return value;155      }156    }157    @Module({158      name: "root",159      providers: [Logger, Router],160      controllers: [MyController]161    })162    class MyModule {163    }164    let modules: Array<IModule> = createModule(MyModule);165    let module: IResolvedModule = {166      module: getModule(modules),167      endpoint: "core",168      action: "index",169      resolvedRoute,170      data171    };172    Promise.resolve(routeResolver.processModule(module))173      .then(resolved => {174        assert.equal(resolved, value);175        done();176      }).catch(done);177  });178  it("Should process GET", (done) => {179    let value = "MY_VALUE";180    @Controller({181      name: "core"182    })183    class MyController {184      @Action("index")185      actionIndex() {186        return value;187      }188    }189    @Module({190      name: "root",191      providers: [Logger, Router],192      controllers: [MyController]193    })194    class MyModule implements IAfterConstruct {195      afterConstruct(): void {196        this.router.addRules([{197          methods: [Methods.GET],198          url: "/",199          route: "core/index"200        }]);201      }202      @Inject(Router)203      private router: Router;204    }205    request.method = "GET";206    request.url = "/";207    request.headers = {};208    let modules: Array<IModule> = createModule(MyModule);209    let injector = Injector.createAndResolveChild(210      getModule(modules).injector,211      HttpRequestResolver,212      [213        {provide: "url", useValue: parse("/", true)},214        {provide: "UUID", useValue: id},215        {provide: "data", useValue: data},216        {provide: "contentType", useValue: "text/html"},217        {provide: "statusCode", useValue: 200},218        {provide: "request", useValue: request},219        {provide: "response", useValue: response},220        {provide: "modules", useValue: modules},221        EventEmitter222      ]223    );224    let myRouteResolver = injector.get(HttpRequestResolver);225    let aSpy = spy(myRouteResolver, "render");226    Promise.resolve(myRouteResolver.process())227      .then(resolved => {228        assert.equal(resolved, value);229        assertSpy.calledWith(aSpy, value);230        done();231      }).catch(done);232  });233  it("Should process POST", (done) => {234    let value = "MY_VALUE";235    @Controller({236      name: "core"237    })238    class MyController {239      @Action("index")240      actionIndex() {241        return value;242      }243    }244    @Module({245      name: "root",246      providers: [Logger, Router],247      controllers: [MyController]248    })249    class MyModule implements IAfterConstruct {250      afterConstruct(): void {251        this.router.addRules([{252          methods: [Methods.POST],253          url: "/",254          route: "core/index"255        }]);256      }257      @Inject(Router)258      private router: Router;259    }260    request.method = "POST";261    request.url = "/";262    request.headers = {};263    let modules: Array<IModule> = createModule(MyModule);264    let injector = Injector.createAndResolveChild(265      getModule(modules).injector,266      HttpRequestResolver,267      [268        {provide: "url", useValue: parse("/", true)},269        {provide: "UUID", useValue: id},270        {provide: "data", useValue: []},271        {provide: "contentType", useValue: "text/html"},272        {provide: "statusCode", useValue: 200},273        {provide: "request", useValue: request},274        {provide: "response", useValue: response},275        {provide: "modules", useValue: modules},276        EventEmitter277      ]278    );279    let myRouteResolver = injector.get(HttpRequestResolver);280    let a = [Buffer.from("a"), Buffer.from("b"), Buffer.from("c")];281    // simulate async data processing282    setTimeout(() => {283      request.emit("data", a[0]);284      request.emit("data", a[1]);285      request.emit("data", a[2]);286      request.emit("end");287    }, 0);288    let aSpy = spy(myRouteResolver, "render");289    let bSpy = spy(myRouteResolver, "processModule");290    Promise.resolve(myRouteResolver.process())291      .then(resolved => {292        let module: IResolvedModule = {293          module: getModule(modules, "root"),294          endpoint: "core",295          action: "index",296          resolvedRoute: {297            method: Methods.POST,298            params: {},299            route: "core/index"300          },301          data: a302        };303        assert.equal(resolved, value);304        assertSpy.calledWith(aSpy, value);305        assertSpy.calledWith(bSpy, module);306        done();307      }).catch(done);308  });...

auth.module.ts

Source:auth.module.ts

1import { NgModule, ModuleWithProviders } from '@angular/core';2import { CommonModule } from '@angular/common';3import { AuthGuardService, AuthorizationsGuard, RootComponentGuard } from '../core/auth-guard.service';4import { UserStorageProvider } from '../core/services/user-storage';5import { GenericUndecoratedSerializaleSerializer } from '../../built-value/core/js/serializer';6import { AppUser, IAppUser } from '../contracts/v2/user/user';7import { IGenericSerializableBuilder, ISerializableBuilder } from '../../built-value/contracts';8import { AuthInterceptorService } from '../core/auth-interceptor.service';9import { HTTP_INTERCEPTORS } from '@angular/common/http';10import { DrewlabsV2LoginResultHandlerFunc } from '../../rxjs/operators';11import { MapToHandlerResponse } from '../../rxjs/types';121314export interface AuthServerConfigs {1516  host: string;17  loginPath: string;18  logoutPath: string;19  usersPath?: string;20  rolesPath?: string;21  authorizationsPath?: string;22  agencesPath?: string;23  departmentsPath?: string;24  companiesPath?: string;2526  //harry add27  rhhost: string;28  rhloginPath: string;293031}3233export interface AuthModuleConfigs {34  loginResponseHandler: MapToHandlerResponse<any>;35  serverConfigs?: AuthServerConfigs;36  userSerializer?: IGenericSerializableBuilder<IAppUser> | ISerializableBuilder<IAppUser>;37}38@NgModule({39  imports: [40    CommonModule41  ]42})43export class AuthModule {44  static forRoot(config?: AuthModuleConfigs): ModuleWithProviders<AuthModule> {45    return {46      ngModule: AuthModule,47      providers: [48        {49          provide: 'USER_SERIALIZER',50          useValue: config ? config.userSerializer || (new GenericUndecoratedSerializaleSerializer<AppUser>())51            : (new GenericUndecoratedSerializaleSerializer<AppUser>())52        },53        { provide: HTTP_INTERCEPTORS, useClass: AuthInterceptorService, multi: true },54        RootComponentGuard,55        AuthGuardService,56        UserStorageProvider,57        AuthorizationsGuard,58        {59          provide: 'LOGIN_RESPONSE_HANDLER_FUNC',60          useValue: config.loginResponseHandler || DrewlabsV2LoginResultHandlerFunc61        },62        {63          provide: 'AUTH_SERVER_HOST',64          useValue: config?.serverConfigs?.host || null65        },66       67        {68          provide: 'AUTH_LOGIN_PATH',69          useValue: config?.serverConfigs?.loginPath || 'auth/login'70        },71        {72          provide: 'AUTH_LOGOUT_PATH',73          useValue: config?.serverConfigs?.logoutPath || 'auth/logout'74        },75        {76          provide: 'AUTH_USERS_RESOURCE_PATH',77          useValue: config?.serverConfigs?.usersPath || 'admin/users'78        },79        {80          provide: 'AUTH_ROLES_RESOURCE_PATH',81          useValue: config?.serverConfigs?.rolesPath || 'admin/roles'82        },83        {84          provide: 'AUTH_AUTHORIZATIONS_RESOURCE_PATH',85          useValue: config?.serverConfigs?.authorizationsPath || 'admin/authorizations'86        },87        {88          provide: 'AUTH_DEPARTMENTS_RESOURCE_PATH',89          useValue: config?.serverConfigs?.departmentsPath || 'admin/departments'90        },91        {92          provide: 'AUTH_COMPANIES_RESOURCE_PATH',93          useValue: config?.serverConfigs?.companiesPath || 'admin/companies'94        },95        {96          provide: 'AUTH_AGENCES_RESOURCE_PATH',97          useValue: config?.serverConfigs?.agencesPath || 'admin/companies'98        },99        //harry add100        {101          provide: 'AUTH_RH_SERVER_HOST',102          useValue: config?.serverConfigs?.rhhost || null103        },104        {105          provide: 'AUTH_RH_LOGIN_PATH',106          useValue: config?.serverConfigs?.rhloginPath || 'auth/login'107        },108      ],109    };110  }
...

jobs.providers.ts

Source:jobs.providers.ts

1import { FUNCTION_REPOSITORY, INDUSTRY_REPOSITORY, JOBS_REPOSITORY, JOB_APPLICATION_REPOSITORY, JOB_FUNCTION_REPOSITORY, JOB_INDUSTRY_REPOSITORY, JOB_LOCATION_REPOSITORY, JOB_QUALIFICATION_REPOSITORY, LOCATION_REPOSITORY, QUALIFICATION_REPOSITORY } from "../constants";2import { FunctionM, Industry, JobApplication, JobPost, JobPostFunction, JobPostIndustry, JobPostLocation, JobPostQualification, Location, Qualification } from "./jobs.entity";3export const jobProviders = [4    {5      provide: JOBS_REPOSITORY,6      useValue: JobPost,7    },8    {9      provide: QUALIFICATION_REPOSITORY,10      useValue: Qualification,11    },12    {13      provide: FUNCTION_REPOSITORY,14      useValue: FunctionM,15    },16    {17      provide: INDUSTRY_REPOSITORY,18      useValue: Industry,19    },20    {21      provide: JOB_QUALIFICATION_REPOSITORY,22      useValue: JobPostQualification,23    },24    {25      provide: JOB_FUNCTION_REPOSITORY,26      useValue: JobPostFunction,27    },28    {29      provide: JOB_INDUSTRY_REPOSITORY,30      useValue: JobPostIndustry,31    },32    {33      provide: LOCATION_REPOSITORY,34      useValue: Location,35    },36    {37      provide: JOB_LOCATION_REPOSITORY,38      useValue: JobPostLocation,39    },40    {41      provide: JOB_APPLICATION_REPOSITORY,42      useValue: JobApplication,43    }...

providers.ts

Source:providers.ts

1import { Provider } from 'ims-core';2import * as tokens from 'ims-tokens';3import { promises } from 'fs';4import { EventEmitter } from 'events';5export default [6  {7    provide: tokens.Express,8    useValue: require('express'),9  },10  {11    provide: tokens.ServeStatic,12    useValue: require('serve-static'),13  },14  {15    provide: tokens.Assert,16    useValue: require('assert'),17  },18  {19    provide: tokens.Schedule,20    useValue: require('node-schedule'),21  },22  {23    provide: tokens.LoggerFactory,24    useValue: require('log4js'),25  },26  {27    provide: tokens.Debug,28    useValue: require('debug'),29  },30  {31    provide: tokens.FsmEvent,32    useValue: require('fsm-event'),33  },34  {35    provide: tokens.Fs,36    useValue: promises,37  },38  {39    provide: tokens.Webpack,40    useValue: require('webpack'),41  },42  {43    provide: tokens.EventEmitter,44    useValue: EventEmitter,45  },46  {47    provide: tokens.Path,48    useValue: require('path'),49  },50  {51    provide: tokens.Process,52    useValue: process,53  },54  {55    provide: tokens.Dirname,56    useValue: __dirname,57  },58  {59    provide: tokens.Filename,60    useValue: __filename,61  },62  {63    provide: tokens.Util,64    useValue: require('util'),65  },66  {67    provide: tokens.Fetch,68    useValue: require('node-fetch'),69  },...

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});10import { useState } from 'react';11export const useCounter = () => {12  const [count, setCount] = useState(0);13  const increment = () => setCount(count + 1);14  return {15  };16};

Using AI Code Generation

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

Using AI Code Generation

1import { renderHook, act } 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});12import { useState } from 'react';13const useCounter = () => {14  const [count, setCount] = useState(0);15  const increment = () => setCount(count + 1);16  return {17  };18};19export default useCounter;20import useCounter from './useCounter';21describe('useCounter', () => {22  it('should increment counter', () => {23    const { result } = renderHook(() => useCounter());24    act(() => {25      result.current.increment();26    });27    expect(result.current.count).toBe(1);28  });29});30import { useState } from 'react';31const useCounter = () => {32  const [count, setCount] = useState(0);33  const increment = () => setCount(count + 1);34  return {35  };36};37export default useCounter;38import useCounter from './useCounter';39describe('useCounter', () => {40  it('should increment counter', () => {41    const { result } = renderHook(() => useCounter());42    act(() => {43      result.current.increment();44    });45    expect(result.current.count).toBe(1);46  });47});48import { useState } from 'react';49const useCounter = () => {50  const [count, setCount] = useState(0);51  const increment = () => setCount(count + 1);52  return {53  };54};55export default useCounter;56import useCounter from './useCounter';57describe('useCounter', () => {58  it('should increment counter', () => {59    const { result } = renderHook(() => useCounter());60    act(() => {61      result.current.increment();62    });63    expect(result.current.count).toBe(1);64  });65});66import { useState

Using AI Code Generation

1import { renderHook } from '@testing-library/react-hooks';2import { useCounter } from './useCounter';3import { act } from 'react-dom/test-utils';4test('should increment counter', () => {5  const { result } = renderHook(() => useCounter());6  act(() => {7    result.current.increment();8  });9  expect(result.current.count).toBe(1);10});11import { useState } from 'react';12export const useCounter = (initialCount = 0) => {13  const [count, setCount] = useState(initialCount);14  const increment = () => {15    setCount(count + 1);16  };17  return {18  };19};20import { renderHook } from '@testing-library/react-hooks';21import { useCounter } from './useCounter';22import { act } from 'react-dom/test-utils';23test('should increment counter', () => {24  const { result } = renderHook(() => useCounter());25  act(() => {26    result.current.increment();27  });28  expect(result.current.count).toBe(1);29});30import { useState } from 'react';31export const useCounter = (initialCount = 0) => {32  const [count, setCount] = useState(initialCount);33  const increment = () => {34    setCount(count + 1);35  };36  return {37  };38};39import { renderHook } from '@testing-library/react-hooks';40import { useCounter } from './useCounter';41import { act } from 'react-dom/test-utils';42test('should increment counter', () => {43  const { result } = renderHook(() => useCounter());44  act(() => {45    result.current.increment();46  });47  expect(result.current.count).toBe(1);48});49import { useState } from 'react';50export const useCounter = (initialCount = 0) => {51  const [count, setCount] = useState(initialCount);52  const increment = () => {53    setCount(count + 1);54  };55  return {56  };57};

Using AI Code Generation

1import React from 'react';2import { renderHook } from '@testing-library/react-hooks';3import { useFetch } from './useFetch';4test('should fetch without error', async () => {5  const { result, waitForNextUpdate } = renderHook(() =>6  );7  expect(result.current.loading).toBe(true);8  expect(result.current.data).toBe(null);9  expect(result.current.error).toBe(null);10  await waitForNextUpdate();11  expect(result.current.loading).toBe(false);12  expect(result.current.data).not.toBe(null);13  expect(result.current.error).toBe(null);14});15import { useState, useEffect } from 'react';16export const useFetch = url => {17  const [data, setData] = useState(null);18  const [loading, setLoading] = useState(true);19  const [error, setError] = useState(null);20  useEffect(() => {21    const fetchData = async () => {22      try {23        const response = await fetch(url);24        const json = await response.json();25        setData(json);26      } catch (error) {27        setError(error);28      } finally {29        setLoading(false);30      }31    };32    fetchData();33  }, [url]);34  return { data, loading, error };35};36import React from 'react';37import { renderHook } from '@testing-library/react-hooks';38import { useFetch } from './useFetch';39test('should fetch without error', async () => {40  const { result, waitForNextUpdate } = renderHook(() =>41  );42  expect(result.current).toMatchInlineSnapshot(`43    Object {44    }45  `);46  await waitForNextUpdate();47  expect(result.current).toMatchInlineSnapshot(`48    Object {49        Object {

Using AI Code Generation

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

Using AI Code Generation

1import { renderHook } from "@testing-library/react-hooks";2import { useFetch } from "./useFetch";3describe("useFetch hook", () => {4  it("should return default value", () => {5    const { result } = renderHook(() => useFetch());6    expect(result.current).toEqual([[], false]);7  });8  it("should return data and loading is true", () => {9    const { result } = renderHook(() => useFetch());10    expect(result.current).toEqual([[], false]);11  });12});13import { useState, useEffect } from "react";14export const useFetch = () => {15  const [data, setData] = useState([]);16  const [loading, setLoading] = useState(false);17  useEffect(() => {18    setLoading(true);19      .then((response) => response.json())20      .then((json) => {21        setData(json);22        setLoading(false);23      });24  }, []);25  return [data, loading];26};27import { useFetch } from "./useFetch";28export default function App() {29  const [data, loading] = useFetch();30  return (31      {loading ? (32      ) : (33        data.map((item, index) => {34          return (35            <div key={index}>36              <h2>{item.title}</h2>

Using AI Code Generation

1import { renderHook } from "@testing-library/react-hooks";2import { useCounter } from "./useCounter";3test("should use value of 0", () => {4  const { result } = renderHook(() => useCounter(0));5  expect(result.current.count).toBe(0);6});7import { renderHook } from "@testing-library/react-hooks";8import { useCounter } from "./useCounter";9test("should use value of 5", () => {10  const { result } = renderHook(() => useCounter(5));11  expect(result.current.count).toBe(5);12});13import { useState } from "react";14export const useCounter = (initialCount) => {15  const [count, setCount] = useState(initialCount);16  const increment = () => setCount(count + 1);17  const decrement = () => setCount(count - 1);18  return { count, increment, decrement };19};20import React from "react";21import { useCounter } from "./useCounter";22function App() {23  const { count, increment, decrement } = useCounter(10);24  return (25      <h1>Counter: {count}</h1>26      <button onClick={increment}>+</button>27      <button onClick={decrement}>-</button>28  );29}30export default App;31import React from "react";32import ReactDOM from "react-dom";33import App from "./App";34import "./index.css";35ReactDOM.render(<App />, document.getElementById("root"));36import "@testing-library/jest-dom/extend-expect";37import "@testing-library/react/cleanup-after-each";38{39  "dependencies": {40  },41  "devDependencies": {

Using AI Code Generation

1import { renderHook, act } from '@testing-library/react-hooks';2import useCounter from './useCounter';3test('useCounter increments 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 default function useCounter() {12  const [count, setCount] = useState(0);13  const increment = () => {14    setCount(count + 1);15  };16  return {17  };18}19import { useEffect } from 'react';20export default function useDocumentTitle(title) {21  useEffect(() => {22    document.title = title;23  });24}

Using AI Code Generation

1import { renderHook } from '@testing-library/react-hooks'2import useFetch from '../hooks/useFetch'3import { act } from 'react-dom/test-utils'4import { waitFor } from '@testing-library/react'5describe('useFetch', () => {6  it('should return the default value', () => {7    const { result } = renderHook(() => useFetch())8    expect(result.current).toEqual({9    })10  })11  it('should return the data', async () => {12    const { result, waitForNextUpdate } = renderHook(() => useFetch())13    act(() => {14      result.current.fetchData('/api/endpoint')15    })16    await waitForNextUpdate()17    expect(result.current).toEqual({18      data: {19      },20    })21  })22  it('should return an error', async () => {23    const { result, waitForNextUpdate } = renderHook(() => useFetch())24    act(() => {25      result.current.fetchData('/api/endpoint')26    })27    await waitForNextUpdate()28    expect(result.current).toEqual({29    })30  })31})32import { renderHook } from '@testing-library/react-hooks'33import useFetch from '../hooks/useFetch'34import { act } from 'react-dom/test-utils'35import { waitFor } from '@testing-library/react'36jest.mock('axios', () => {37  return {38    get: jest.fn().mockImplementationOnce(() => {39      return Promise.resolve({40        data: {41        },42      })43    }),44  }45})46describe('useFetch', () => {47  it('should return the default value', () => {48    const { result } = renderHook(() => useFetch())49    expect(result.current).toEqual({50    })51  })52  it('should return the data', async () => {53    const { result, waitForNextUpdate } = renderHook(() => useFetch())54    act(() => {55      result.current.fetchData('/api/endpoint')56    })57    await waitForNextUpdate()58    expect(result

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.