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How to use runGlobalHook method in Jest

Best JavaScript code snippet using jest

index.js

Source:index.js

...146      Logger.log(`${Logger.colors.green('â')} Completed [${hookName}].`);147      return result;148    });149  }150  runGlobalHook(hookName) {151    if (!this.globalHooks[hookName]) {152      return Promise.resolve();153    }154    return this.handleRunnable(hookName, () => {155      return this.globalHooks[hookName].run(this.client);156    });157  }158  createSession() {159    if (this.client.sessionId || this.context.unitTestsMode) {160      return Promise.resolve();161    }162    return this.client.createSession(this.argv);163  }164  /**165   * Runs the test suite, including all hooks166   */167  runTestSuite() {168    return this.createSession()169      .catch(err => {170        err.sessionCreate = true;171        this.reporter.registerTestError(err);172        throw err;173      })174      .then(data => {175        this.setReportPrefix(data);176        return this.runGlobalHook('beforeEach');177      })178      .then(() => this.runHook('before'))179      .then(result => {180        if (result instanceof Error) {181          Logger.error(result);182        }183        return this.runNextTestCase();184      })185      .catch(err => {186        if (err.sessionCreate) {187          throw err;188        }189        if (!isAssertionError(err)) {190          Logger.error(err);191        }192        // testcase failed - this catch ensures that the after hook is being called193        return err;194      })195      .then(_ => this.runHook('after'))196      .catch(err => {197        if (err.code === 'ECONNREFUSED') {198          throw err;199        }200        if (!err.sessionCreate) {201          Logger.error(err);202        }203        // testsuite failed - this catch ensures that the global afterEach will always run204        return this.terminate('FAILED');205      })206      .then(_ => this.runGlobalHook('afterEach'))207      .catch(err => {208        if (err.sessionCreate) {209          throw err;210        }211        Logger.error(err);212        // catching errors thrown inside the global afterEach213        return true;214      })215      .then(failures => {216        if (this.shouldRetrySuite()) {217          return this.retrySuite();218        }219        return failures;220      })...

jest-cli_vx.x.x.js

Source:jest-cli_vx.x.x.js

1// flow-typed signature: c54c443d1fcfb03f0e9d849770c079912// flow-typed version: <<STUB>>/jest-cli_v^24.1.0/flow_v0.92.13/**4 * This is an autogenerated libdef stub for:5 *6 *   'jest-cli'7 *8 * Fill this stub out by replacing all the `any` types.9 *10 * Once filled out, we encourage you to share your work with the11 * community by sending a pull request to:12 * https://github.com/flowtype/flow-typed13 */14declare module 'jest-cli' {15  declare module.exports: any;16}17/**18 * We include stubs for each file inside this npm package in case you need to19 * require those files directly. Feel free to delete any files that aren't20 * needed.21 */22declare module 'jest-cli/bin/jest' {23  declare module.exports: any;24}25declare module 'jest-cli/build/cli/args' {26  declare module.exports: any;27}28declare module 'jest-cli/build/cli/index' {29  declare module.exports: any;30}31declare module 'jest-cli/build/collectHandles' {32  declare module.exports: any;33}34declare module 'jest-cli/build/constants' {35  declare module.exports: any;36}37declare module 'jest-cli/build/FailedTestsCache' {38  declare module.exports: any;39}40declare module 'jest-cli/build/generateEmptyCoverage' {41  declare module.exports: any;42}43declare module 'jest-cli/build/getChangedFilesPromise' {44  declare module.exports: any;45}46declare module 'jest-cli/build/getNoTestFound' {47  declare module.exports: any;48}49declare module 'jest-cli/build/getNoTestFoundFailed' {50  declare module.exports: any;51}52declare module 'jest-cli/build/getNoTestFoundRelatedToChangedFiles' {53  declare module.exports: any;54}55declare module 'jest-cli/build/getNoTestFoundVerbose' {56  declare module.exports: any;57}58declare module 'jest-cli/build/getNoTestsFoundMessage' {59  declare module.exports: any;60}61declare module 'jest-cli/build/jest' {62  declare module.exports: any;63}64declare module 'jest-cli/build/lib/active_filters_message' {65  declare module.exports: any;66}67declare module 'jest-cli/build/lib/create_context' {68  declare module.exports: any;69}70declare module 'jest-cli/build/lib/handle_deprecation_warnings' {71  declare module.exports: any;72}73declare module 'jest-cli/build/lib/init/errors' {74  declare module.exports: any;75}76declare module 'jest-cli/build/lib/init/generate_config_file' {77  declare module.exports: any;78}79declare module 'jest-cli/build/lib/init/index' {80  declare module.exports: any;81}82declare module 'jest-cli/build/lib/init/modify_package_json' {83  declare module.exports: any;84}85declare module 'jest-cli/build/lib/init/questions' {86  declare module.exports: any;87}88declare module 'jest-cli/build/lib/is_valid_path' {89  declare module.exports: any;90}91declare module 'jest-cli/build/lib/log_debug_messages' {92  declare module.exports: any;93}94declare module 'jest-cli/build/lib/update_global_config' {95  declare module.exports: any;96}97declare module 'jest-cli/build/lib/watch_plugins_helpers' {98  declare module.exports: any;99}100declare module 'jest-cli/build/plugins/quit' {101  declare module.exports: any;102}103declare module 'jest-cli/build/plugins/test_name_pattern' {104  declare module.exports: any;105}106declare module 'jest-cli/build/plugins/test_path_pattern' {107  declare module.exports: any;108}109declare module 'jest-cli/build/plugins/update_snapshots_interactive' {110  declare module.exports: any;111}112declare module 'jest-cli/build/plugins/update_snapshots' {113  declare module.exports: any;114}115declare module 'jest-cli/build/pluralize' {116  declare module.exports: any;117}118declare module 'jest-cli/build/preRunMessage' {119  declare module.exports: any;120}121declare module 'jest-cli/build/ReporterDispatcher' {122  declare module.exports: any;123}124declare module 'jest-cli/build/reporters/base_reporter' {125  declare module.exports: any;126}127declare module 'jest-cli/build/reporters/coverage_reporter' {128  declare module.exports: any;129}130declare module 'jest-cli/build/reporters/coverage_worker' {131  declare module.exports: any;132}133declare module 'jest-cli/build/reporters/default_reporter' {134  declare module.exports: any;135}136declare module 'jest-cli/build/reporters/get_result_header' {137  declare module.exports: any;138}139declare module 'jest-cli/build/reporters/get_snapshot_status' {140  declare module.exports: any;141}142declare module 'jest-cli/build/reporters/get_snapshot_summary' {143  declare module.exports: any;144}145declare module 'jest-cli/build/reporters/notify_reporter' {146  declare module.exports: any;147}148declare module 'jest-cli/build/reporters/Status' {149  declare module.exports: any;150}151declare module 'jest-cli/build/reporters/summary_reporter' {152  declare module.exports: any;153}154declare module 'jest-cli/build/reporters/utils' {155  declare module.exports: any;156}157declare module 'jest-cli/build/reporters/verbose_reporter' {158  declare module.exports: any;159}160declare module 'jest-cli/build/runGlobalHook' {161  declare module.exports: any;162}163declare module 'jest-cli/build/runJest' {164  declare module.exports: any;165}166declare module 'jest-cli/build/SearchSource' {167  declare module.exports: any;168}169declare module 'jest-cli/build/SnapshotInteractiveMode' {170  declare module.exports: any;171}172declare module 'jest-cli/build/TestNamePatternPrompt' {173  declare module.exports: any;174}175declare module 'jest-cli/build/TestPathPatternPrompt' {176  declare module.exports: any;177}178declare module 'jest-cli/build/testPathPatternToRegexp' {179  declare module.exports: any;180}181declare module 'jest-cli/build/testResultHelpers' {182  declare module.exports: any;183}184declare module 'jest-cli/build/TestScheduler' {185  declare module.exports: any;186}187declare module 'jest-cli/build/testSchedulerHelper' {188  declare module.exports: any;189}190declare module 'jest-cli/build/TestSequencer' {191  declare module.exports: any;192}193declare module 'jest-cli/build/TestWatcher' {194  declare module.exports: any;195}196declare module 'jest-cli/build/types' {197  declare module.exports: any;198}199declare module 'jest-cli/build/version' {200  declare module.exports: any;201}202declare module 'jest-cli/build/watch' {203  declare module.exports: any;204}205// Filename aliases206declare module 'jest-cli/bin/jest.js' {207  declare module.exports: $Exports<'jest-cli/bin/jest'>;208}209declare module 'jest-cli/build/cli/args.js' {210  declare module.exports: $Exports<'jest-cli/build/cli/args'>;211}212declare module 'jest-cli/build/cli/index.js' {213  declare module.exports: $Exports<'jest-cli/build/cli/index'>;214}215declare module 'jest-cli/build/collectHandles.js' {216  declare module.exports: $Exports<'jest-cli/build/collectHandles'>;217}218declare module 'jest-cli/build/constants.js' {219  declare module.exports: $Exports<'jest-cli/build/constants'>;220}221declare module 'jest-cli/build/FailedTestsCache.js' {222  declare module.exports: $Exports<'jest-cli/build/FailedTestsCache'>;223}224declare module 'jest-cli/build/generateEmptyCoverage.js' {225  declare module.exports: $Exports<'jest-cli/build/generateEmptyCoverage'>;226}227declare module 'jest-cli/build/getChangedFilesPromise.js' {228  declare module.exports: $Exports<'jest-cli/build/getChangedFilesPromise'>;229}230declare module 'jest-cli/build/getNoTestFound.js' {231  declare module.exports: $Exports<'jest-cli/build/getNoTestFound'>;232}233declare module 'jest-cli/build/getNoTestFoundFailed.js' {234  declare module.exports: $Exports<'jest-cli/build/getNoTestFoundFailed'>;235}236declare module 'jest-cli/build/getNoTestFoundRelatedToChangedFiles.js' {237  declare module.exports: $Exports<'jest-cli/build/getNoTestFoundRelatedToChangedFiles'>;238}239declare module 'jest-cli/build/getNoTestFoundVerbose.js' {240  declare module.exports: $Exports<'jest-cli/build/getNoTestFoundVerbose'>;241}242declare module 'jest-cli/build/getNoTestsFoundMessage.js' {243  declare module.exports: $Exports<'jest-cli/build/getNoTestsFoundMessage'>;244}245declare module 'jest-cli/build/jest.js' {246  declare module.exports: $Exports<'jest-cli/build/jest'>;247}248declare module 'jest-cli/build/lib/active_filters_message.js' {249  declare module.exports: $Exports<'jest-cli/build/lib/active_filters_message'>;250}251declare module 'jest-cli/build/lib/create_context.js' {252  declare module.exports: $Exports<'jest-cli/build/lib/create_context'>;253}254declare module 'jest-cli/build/lib/handle_deprecation_warnings.js' {255  declare module.exports: $Exports<'jest-cli/build/lib/handle_deprecation_warnings'>;256}257declare module 'jest-cli/build/lib/init/errors.js' {258  declare module.exports: $Exports<'jest-cli/build/lib/init/errors'>;259}260declare module 'jest-cli/build/lib/init/generate_config_file.js' {261  declare module.exports: $Exports<'jest-cli/build/lib/init/generate_config_file'>;262}263declare module 'jest-cli/build/lib/init/index.js' {264  declare module.exports: $Exports<'jest-cli/build/lib/init/index'>;265}266declare module 'jest-cli/build/lib/init/modify_package_json.js' {267  declare module.exports: $Exports<'jest-cli/build/lib/init/modify_package_json'>;268}269declare module 'jest-cli/build/lib/init/questions.js' {270  declare module.exports: $Exports<'jest-cli/build/lib/init/questions'>;271}272declare module 'jest-cli/build/lib/is_valid_path.js' {273  declare module.exports: $Exports<'jest-cli/build/lib/is_valid_path'>;274}275declare module 'jest-cli/build/lib/log_debug_messages.js' {276  declare module.exports: $Exports<'jest-cli/build/lib/log_debug_messages'>;277}278declare module 'jest-cli/build/lib/update_global_config.js' {279  declare module.exports: $Exports<'jest-cli/build/lib/update_global_config'>;280}281declare module 'jest-cli/build/lib/watch_plugins_helpers.js' {282  declare module.exports: $Exports<'jest-cli/build/lib/watch_plugins_helpers'>;283}284declare module 'jest-cli/build/plugins/quit.js' {285  declare module.exports: $Exports<'jest-cli/build/plugins/quit'>;286}287declare module 'jest-cli/build/plugins/test_name_pattern.js' {288  declare module.exports: $Exports<'jest-cli/build/plugins/test_name_pattern'>;289}290declare module 'jest-cli/build/plugins/test_path_pattern.js' {291  declare module.exports: $Exports<'jest-cli/build/plugins/test_path_pattern'>;292}293declare module 'jest-cli/build/plugins/update_snapshots_interactive.js' {294  declare module.exports: $Exports<'jest-cli/build/plugins/update_snapshots_interactive'>;295}296declare module 'jest-cli/build/plugins/update_snapshots.js' {297  declare module.exports: $Exports<'jest-cli/build/plugins/update_snapshots'>;298}299declare module 'jest-cli/build/pluralize.js' {300  declare module.exports: $Exports<'jest-cli/build/pluralize'>;301}302declare module 'jest-cli/build/preRunMessage.js' {303  declare module.exports: $Exports<'jest-cli/build/preRunMessage'>;304}305declare module 'jest-cli/build/ReporterDispatcher.js' {306  declare module.exports: $Exports<'jest-cli/build/ReporterDispatcher'>;307}308declare module 'jest-cli/build/reporters/base_reporter.js' {309  declare module.exports: $Exports<'jest-cli/build/reporters/base_reporter'>;310}311declare module 'jest-cli/build/reporters/coverage_reporter.js' {312  declare module.exports: $Exports<'jest-cli/build/reporters/coverage_reporter'>;313}314declare module 'jest-cli/build/reporters/coverage_worker.js' {315  declare module.exports: $Exports<'jest-cli/build/reporters/coverage_worker'>;316}317declare module 'jest-cli/build/reporters/default_reporter.js' {318  declare module.exports: $Exports<'jest-cli/build/reporters/default_reporter'>;319}320declare module 'jest-cli/build/reporters/get_result_header.js' {321  declare module.exports: $Exports<'jest-cli/build/reporters/get_result_header'>;322}323declare module 'jest-cli/build/reporters/get_snapshot_status.js' {324  declare module.exports: $Exports<'jest-cli/build/reporters/get_snapshot_status'>;325}326declare module 'jest-cli/build/reporters/get_snapshot_summary.js' {327  declare module.exports: $Exports<'jest-cli/build/reporters/get_snapshot_summary'>;328}329declare module 'jest-cli/build/reporters/notify_reporter.js' {330  declare module.exports: $Exports<'jest-cli/build/reporters/notify_reporter'>;331}332declare module 'jest-cli/build/reporters/Status.js' {333  declare module.exports: $Exports<'jest-cli/build/reporters/Status'>;334}335declare module 'jest-cli/build/reporters/summary_reporter.js' {336  declare module.exports: $Exports<'jest-cli/build/reporters/summary_reporter'>;337}338declare module 'jest-cli/build/reporters/utils.js' {339  declare module.exports: $Exports<'jest-cli/build/reporters/utils'>;340}341declare module 'jest-cli/build/reporters/verbose_reporter.js' {342  declare module.exports: $Exports<'jest-cli/build/reporters/verbose_reporter'>;343}344declare module 'jest-cli/build/runGlobalHook.js' {345  declare module.exports: $Exports<'jest-cli/build/runGlobalHook'>;346}347declare module 'jest-cli/build/runJest.js' {348  declare module.exports: $Exports<'jest-cli/build/runJest'>;349}350declare module 'jest-cli/build/SearchSource.js' {351  declare module.exports: $Exports<'jest-cli/build/SearchSource'>;352}353declare module 'jest-cli/build/SnapshotInteractiveMode.js' {354  declare module.exports: $Exports<'jest-cli/build/SnapshotInteractiveMode'>;355}356declare module 'jest-cli/build/TestNamePatternPrompt.js' {357  declare module.exports: $Exports<'jest-cli/build/TestNamePatternPrompt'>;358}359declare module 'jest-cli/build/TestPathPatternPrompt.js' {360  declare module.exports: $Exports<'jest-cli/build/TestPathPatternPrompt'>;361}362declare module 'jest-cli/build/testPathPatternToRegexp.js' {363  declare module.exports: $Exports<'jest-cli/build/testPathPatternToRegexp'>;364}365declare module 'jest-cli/build/testResultHelpers.js' {366  declare module.exports: $Exports<'jest-cli/build/testResultHelpers'>;367}368declare module 'jest-cli/build/TestScheduler.js' {369  declare module.exports: $Exports<'jest-cli/build/TestScheduler'>;370}371declare module 'jest-cli/build/testSchedulerHelper.js' {372  declare module.exports: $Exports<'jest-cli/build/testSchedulerHelper'>;373}374declare module 'jest-cli/build/TestSequencer.js' {375  declare module.exports: $Exports<'jest-cli/build/TestSequencer'>;376}377declare module 'jest-cli/build/TestWatcher.js' {378  declare module.exports: $Exports<'jest-cli/build/TestWatcher'>;379}380declare module 'jest-cli/build/types.js' {381  declare module.exports: $Exports<'jest-cli/build/types'>;382}383declare module 'jest-cli/build/version.js' {384  declare module.exports: $Exports<'jest-cli/build/version'>;385}386declare module 'jest-cli/build/watch.js' {387  declare module.exports: $Exports<'jest-cli/build/watch'>;...

testsuite.js

Source:testsuite.js

...131      Logger.log(`${Logger.colors.green('â')} Completed [${hookName}].`);132      return result;133    });134  }135  runGlobalHook(hookName) {136    if (!this.globalHooks[hookName]) {137      return Promise.resolve();138    }139    return this.handleRunnable(hookName, () => {140      return this.globalHooks[hookName].run(this.api);141    });142  }143  createSession() {144    if (this.client.sessionId || this.context.unitTestsMode) {145      return Promise.resolve();146    }147    return this.client.createSession();148  }149  /**150   * Runs the test suite, including all hooks151   */152  runTestSuite() {153    return this.createSession()154      .catch(err => {155        err.sessionCreate = true;156        this.reporter.registerTestError(err);157        throw err;158      })159      .then(data => {160        this.setReportPrefix(data);161        return this.runGlobalHook('beforeEach');162      })163      .then(() => this.runHook('before'))164      .then(result => {165        if (result instanceof Error) {166          Logger.error(result);167        }168        return this.runNextTestCase();169      })170      .catch(err => {171        if (err.sessionCreate) {172          throw err;173        }174        Logger.error(err);175        // testcase failed - this catch ensures that the after hook is being called176        return err;177      })178      .then(_ => {179        return this.runHook('after');180      })181      .catch(err => {182        if (err.code === 'ECONNREFUSED') {183          throw err;184        }185        if (!err.sessionCreate) {186          Logger.error(err);187        }188        // testsuite failed - this catch ensures that the global afterEach will always run189        return this.terminate('FAILED');190      })191      .then(_ => this.runGlobalHook('afterEach'))192      .catch(err => {193        if (err.sessionCreate) {194          throw err;195        }196        Logger.error(err);197        // catching errors thrown inside the global afterEach198        return true;199      })200      .then(failures => {201        if (this.shouldRetrySuite()) {202          return this.retrySuite();203        }204        return failures;205      })...

cli.js

Source:cli.js

...112  parseTestSettings(settings = {}) {113    this.initTestSettings(settings, this.baseSettings, this.argv, this.testEnv);114    return this;115  }116  runGlobalHook(key) {117    if (!Concurrency.isChildProcess()) {118      return this.globals.hooks[key].run();119    }120    return Promise.resolve();121  }122  validateTestEnvironments() {123    for (let i = 0; i < this.testEnvArray.length; i++) {124      if (!(this.testEnvArray[i] in this.baseSettings.test_settings)) {125        throw new Error(`Invalid testing environment specified: ${this.testEnvArray[i]}. Available environments are: ${this.availableTestEnvs.join(', ')}`);126      }127    }128    return this;129  }130  ///////////////////////////////////////////////////////////////////////////////////////////////////////////131  // Concurrency related132  ///////////////////////////////////////////////////////////////////////////////////////////////////////////133  parallelMode(modules = null) {134    let testWorkerMode = this.test_settings.testWorkersEnabled && !this.testRunner.isTestWorker();135    if (testWorkerMode && Array.isArray(modules) && modules.length <= 1) {136      return false;137    }138    return this.testEnvArray.length > 1 || testWorkerMode;139  }140  setupConcurrency() {141    WebDriver.concurrencyEnabled = this.isConcurrencyEnabled();142    if (this.isWebDriverManaged()) {143      WebDriver.createInstances(this.baseSettings, this.argv, this.testEnvArray);144    }145    this.concurrency = new Concurrency(this.test_settings, this.argv);146    return this;147  }148  isWebDriverManaged() {149    return this.test_settings.webdriver.start_process && !Concurrency.isChildProcess();150  }151  isConcurrencyEnabled(modules) {152    if (!this.testRunner) {153      throw new Error('No test runner available.');154    }155    return this.testRunner.supportsConcurrency && this.parallelMode(modules);156  }157  startWebDriver() {158    if (!this.isWebDriverManaged()) {159      return Promise.resolve();160    }161    return WebDriver.startInstances().catch(err => {162      Logger.error(err);163      if (err.errorOut) {164        Logger.error(err.errorOut);165      }166      throw err;167    });168  }169  stopWebDriver() {170    if (!this.isWebDriverManaged()) {171      return Promise.resolve();172    }173    return WebDriver.stopInstances();174  }175  ///////////////////////////////////////////////////////////////////////////////////////////////////////////176  // Test runner related177  ///////////////////////////////////////////////////////////////////////////////////////////////////////////178  executeTestRunner(modules) {179    return this.testRunner.run(modules);180  }181  createTestRunner() {182    this.testRunner = Runner.create(this.test_settings, this.argv, {183      globalHooks: this.globals ? this.globals.hooks : null184    });185    this.processListener.setTestRunner(this.testRunner);186    return this;187  }188  /**189   *190   * @param [done]191   * @return {*}192   */193  runTests(done = null) {194    return this.runGlobalHook('before')195      .then(_ => {196        return Runner.readTestSource(this.test_settings, this.argv);197      })198      .then(modules => {199        if (this.isConcurrencyEnabled(modules)) {200          return this.testRunner.runConcurrent(this.testEnvArray, modules)201            .then(exitCode => {202              if (exitCode > 0) {203                this.processListener.setExitCode(exitCode);204              }205            });206        }207        return this.executeTestRunner(modules);208      })209      .catch(err => {210        if (err.detailedErr) {211          err.data = err.detailedErr;212        }213        Logger.error(err);214        if (err.data) {215          Logger.warn(' ' + err.data);216        }217        return err;218      })219      .then(errorOrFailed => {220        if (errorOrFailed instanceof Error || errorOrFailed === true) {221          try {222            this.processListener.setExitCode(5);223          } catch (e) {224            console.error(e);225          }226        }227        return this.runGlobalHook('after')228          .then(result => {229            return errorOrFailed;230          });231      })232      .catch(err => {233        Logger.error(err);234        console.log('');235        try {236          this.processListener.setExitCode(5);237        } catch (e) {238          console.error(e);239        }240        return err;241      })...

runJest.js

Source:runJest.js

...219  if (globalConfig.detectOpenHandles) {220    collectHandles = collectNodeHandles();221  }222  if (hasTests) {223    await runGlobalHook({allTests, globalConfig, moduleName: 'globalSetup'});224  }225  const results = await new TestScheduler(226    globalConfig,227    {228      startRun,229    },230    testSchedulerContext,231  ).scheduleTests(allTests, testWatcher);232  sequencer.cacheResults(allTests, results);233  if (hasTests) {234    await runGlobalHook({allTests, globalConfig, moduleName: 'globalTeardown'});235  }236  return processResults(results, {237    collectHandles,238    isJSON: globalConfig.json,239    onComplete,240    outputFile: globalConfig.outputFile,241    outputStream,242    testResultsProcessor: globalConfig.testResultsProcessor,243  });...

runGlobalHook.js

Source:runGlobalHook.js

...72 *73 * This source code is licensed under the MIT license found in the74 * LICENSE file in the root directory of this source tree.75 */76async function runGlobalHook({allTests, globalConfig, moduleName}) {77  const globalModulePaths = new Set(78    allTests.map(test => test.context.config[moduleName])79  );80  if (globalConfig[moduleName]) {81    globalModulePaths.add(globalConfig[moduleName]);82  }83  if (globalModulePaths.size > 0) {84    for (const modulePath of globalModulePaths) {85      if (!modulePath) {86        continue;87      }88      const correctConfig = allTests.find(89        t => t.context.config[moduleName] === modulePath90      );...

Jest Testing Tutorial

LambdaTest’s Jest Testing Tutorial covers step-by-step guides around Jest with code examples to help you be proficient with the Jest framework. The Jest tutorial has chapters to help you learn right from the basics of Jest framework to code-based tutorials around testing react apps with Jest, perform snapshot testing, import ES modules and more.

Chapters

What is Jest Framework
Advantages of Jest - Jest has 3,898,000 GitHub repositories, as mentioned on its official website. Learn what makes Jest special and why Jest has gained popularity among the testing and developer community.
Jest Installation - All the prerequisites and set up steps needed to help you start Jest automation testing.
Using Jest with NodeJS Project - Learn how to leverage Jest framework to automate testing using a NodeJS Project.
Writing First Test for Jest Framework - Get started with code-based tutorial to help you write and execute your first Jest framework testing script.
Jest Vocabulary - Learn the industry renowned and official jargons of the Jest framework by digging deep into the Jest vocabulary.
Unit Testing with Jest - Step-by-step tutorial to help you execute unit testing with Jest framework.
Jest Basics - Learn about the most pivotal and basic features which makes Jest special.
Jest Parameterized Tests - Avoid code duplication and fasten automation testing with Jest using parameterized tests. Parameterization allows you to trigger the same test scenario over different test configurations by incorporating parameters.
Jest Matchers - Enforce assertions better with the help of matchers. Matchers help you compare the actual output with the expected one. Here is an example to see if the object is acquired from the correct class or not. -

|it('check_object_of_Car', () => { expect(newCar()).toBeInstanceOf(Car); });| | :- |

Jest Hooks: Setup and Teardown - Learn how to set up conditions which needs to be followed by the test execution and incorporate a tear down function to free resources after the execution is complete.
Jest Code Coverage - Unsure there is no code left unchecked in your application. Jest gives a specific flag called --coverage to help you generate code coverage.
HTML Report Generation - Learn how to create a comprehensive HTML report based on your Jest test execution.
Testing React app using Jest Framework - Learn how to test your react web-application with Jest framework in this detailed Jest tutorial.
Test using LambdaTest cloud Selenium Grid - Run your Jest testing script over LambdaTest cloud-based platform and leverage parallel testing to help trim down your test execution time.
Snapshot Testing for React Front Ends - Capture screenshots of your react based web-application and compare them automatically for visual anomalies with the help of Jest tutorial.
Bonus: Import ES modules with Jest - ES modules are also known as ECMAScript modules. Learn how to best use them by importing in your Jest testing scripts.
Jest vs Mocha vs Jasmine - Learn the key differences between the most popular JavaScript-based testing frameworks i.e. Jest, Mocha, and Jasmine.
Jest FAQs(Frequently Asked Questions) - Explore the most commonly asked questions around Jest framework, with their answers.