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How to use verifyDirectoryExists method in Jest

Best JavaScript code snippet using jest

normalize.js

Source:normalize.js

...147    ERROR,148    message,149    _utils.DOCUMENTATION_NOTE150  );151function verifyDirectoryExists(path, key) {152  try {153    const rootStat = (0, _gracefulFs().statSync)(path);154    if (!rootStat.isDirectory()) {155      throw createConfigError(156        `  ${_chalk().default.bold(path)} in the ${_chalk().default.bold(157          key158        )} option is not a directory.`159      );160    }161  } catch (err) {162    if (err instanceof _jestValidate().ValidationError) {163      throw err;164    }165    if (err.code === 'ENOENT') {166      throw createConfigError(167        `  Directory ${_chalk().default.bold(168          path169        )} in the ${_chalk().default.bold(key)} option was not found.`170      );171    } // Not sure in which cases `statSync` can throw, so let's just show the underlying error to the user172    throw createConfigError(173      `  Got an error trying to find ${_chalk().default.bold(174        path175      )} in the ${_chalk().default.bold(key)} option.\n\n  Error was: ${176        err.message177      }`178    );179  }180} // TS 3.5 forces us to split these into 2181const mergeModuleNameMapperWithPreset = (options, preset) => {182  if (options['moduleNameMapper'] && preset['moduleNameMapper']) {183    options['moduleNameMapper'] = {184      ...options['moduleNameMapper'],185      ...preset['moduleNameMapper'],186      ...options['moduleNameMapper']187    };188  }189};190const mergeTransformWithPreset = (options, preset) => {191  if (options['transform'] && preset['transform']) {192    options['transform'] = {193      ...options['transform'],194      ...preset['transform'],195      ...options['transform']196    };197  }198};199const mergeGlobalsWithPreset = (options, preset) => {200  if (options['globals'] && preset['globals']) {201    options['globals'] = (0, _deepmerge().default)(202      preset['globals'],203      options['globals']204    );205  }206};207const setupPreset = (options, optionsPreset) => {208  let preset;209  const presetPath = (0, _utils.replaceRootDirInPath)(210    options.rootDir,211    optionsPreset212  );213  const presetModule = _jestResolve().default.findNodeModule(214    presetPath.startsWith('.')215      ? presetPath216      : path().join(presetPath, PRESET_NAME),217    {218      basedir: options.rootDir,219      extensions: PRESET_EXTENSIONS220    }221  );222  try {223    if (!presetModule) {224      throw new Error(`Cannot find module '${presetPath}'`);225    } // Force re-evaluation to support multiple projects226    try {227      delete require.cache[require.resolve(presetModule)];228    } catch {}229    preset = require(presetModule);230  } catch (error) {231    if (error instanceof SyntaxError || error instanceof TypeError) {232      throw createConfigError(233        `  Preset ${_chalk().default.bold(presetPath)} is invalid:\n\n  ${234          error.message235        }\n  ${error.stack}`236      );237    }238    if (error.message.includes('Cannot find module')) {239      if (error.message.includes(presetPath)) {240        const preset = _jestResolve().default.findNodeModule(presetPath, {241          basedir: options.rootDir242        });243        if (preset) {244          throw createConfigError(245            `  Module ${_chalk().default.bold(246              presetPath247            )} should have "jest-preset.js" or "jest-preset.json" file at the root.`248          );249        }250        throw createConfigError(251          `  Preset ${_chalk().default.bold(presetPath)} not found.`252        );253      }254      throw createConfigError(255        `  Missing dependency in ${_chalk().default.bold(presetPath)}:\n\n  ${256          error.message257        }\n  ${error.stack}`258      );259    }260    throw createConfigError(261      `  An unknown error occurred in ${_chalk().default.bold(262        presetPath263      )}:\n\n  ${error.message}\n  ${error.stack}`264    );265  }266  if (options.setupFiles) {267    options.setupFiles = (preset.setupFiles || []).concat(options.setupFiles);268  }269  if (options.setupFilesAfterEnv) {270    options.setupFilesAfterEnv = (preset.setupFilesAfterEnv || []).concat(271      options.setupFilesAfterEnv272    );273  }274  if (options.modulePathIgnorePatterns && preset.modulePathIgnorePatterns) {275    options.modulePathIgnorePatterns = preset.modulePathIgnorePatterns.concat(276      options.modulePathIgnorePatterns277    );278  }279  mergeModuleNameMapperWithPreset(options, preset);280  mergeTransformWithPreset(options, preset);281  mergeGlobalsWithPreset(options, preset);282  return {...preset, ...options};283};284const setupBabelJest = options => {285  const transform = options.transform;286  let babelJest;287  if (transform) {288    const customJSPattern = Object.keys(transform).find(pattern => {289      const regex = new RegExp(pattern);290      return regex.test('a.js') || regex.test('a.jsx');291    });292    const customTSPattern = Object.keys(transform).find(pattern => {293      const regex = new RegExp(pattern);294      return regex.test('a.ts') || regex.test('a.tsx');295    });296    [customJSPattern, customTSPattern].forEach(pattern => {297      if (pattern) {298        const customTransformer = transform[pattern];299        if (Array.isArray(customTransformer)) {300          if (customTransformer[0] === 'babel-jest') {301            babelJest = require.resolve('babel-jest');302            customTransformer[0] = babelJest;303          } else if (customTransformer[0].includes('babel-jest')) {304            babelJest = customTransformer[0];305          }306        } else {307          if (customTransformer === 'babel-jest') {308            babelJest = require.resolve('babel-jest');309            transform[pattern] = babelJest;310          } else if (customTransformer.includes('babel-jest')) {311            babelJest = customTransformer;312          }313        }314      }315    });316  } else {317    babelJest = require.resolve('babel-jest');318    options.transform = {319      [_constants.DEFAULT_JS_PATTERN]: babelJest320    };321  }322};323const normalizeCollectCoverageOnlyFrom = (options, key) => {324  const initialCollectCoverageFrom = options[key];325  const collectCoverageOnlyFrom = Array.isArray(initialCollectCoverageFrom)326    ? initialCollectCoverageFrom // passed from argv327    : Object.keys(initialCollectCoverageFrom); // passed from options328  return collectCoverageOnlyFrom.reduce((map, filePath) => {329    filePath = path().resolve(330      options.rootDir,331      (0, _utils.replaceRootDirInPath)(options.rootDir, filePath)332    );333    map[filePath] = true;334    return map;335  }, Object.create(null));336};337const normalizeCollectCoverageFrom = (options, key) => {338  const initialCollectCoverageFrom = options[key];339  let value;340  if (!initialCollectCoverageFrom) {341    value = [];342  }343  if (!Array.isArray(initialCollectCoverageFrom)) {344    try {345      value = JSON.parse(initialCollectCoverageFrom);346    } catch {}347    if (options[key] && !Array.isArray(value)) {348      value = [initialCollectCoverageFrom];349    }350  } else {351    value = initialCollectCoverageFrom;352  }353  if (value) {354    value = value.map(filePath =>355      filePath.replace(/^(!?)(<rootDir>\/)(.*)/, '$1$3')356    );357  }358  return value;359};360const normalizeUnmockedModulePathPatterns = (361  options,362  key // _replaceRootDirTags is specifically well-suited for substituting363) =>364  // <rootDir> in paths (it deals with properly interpreting relative path365  // separators, etc).366  //367  // For patterns, direct global substitution is far more ideal, so we368  // special case substitutions for patterns here.369  options[key].map(pattern =>370    (0, _jestRegexUtil().replacePathSepForRegex)(371      pattern.replace(/<rootDir>/g, options.rootDir)372    )373  );374const normalizePreprocessor = options => {375  if (options.scriptPreprocessor && options.transform) {376    throw createConfigError(`  Options: ${_chalk().default.bold(377      'scriptPreprocessor'378    )} and ${_chalk().default.bold('transform')} cannot be used together.379  Please change your configuration to only use ${_chalk().default.bold(380    'transform'381  )}.`);382  }383  if (options.preprocessorIgnorePatterns && options.transformIgnorePatterns) {384    throw createConfigError(`  Options ${_chalk().default.bold(385      'preprocessorIgnorePatterns'386    )} and ${_chalk().default.bold(387      'transformIgnorePatterns'388    )} cannot be used together.389  Please change your configuration to only use ${_chalk().default.bold(390    'transformIgnorePatterns'391  )}.`);392  }393  if (options.scriptPreprocessor) {394    options.transform = {395      '.*': options.scriptPreprocessor396    };397  }398  if (options.preprocessorIgnorePatterns) {399    options.transformIgnorePatterns = options.preprocessorIgnorePatterns;400  }401  delete options.scriptPreprocessor;402  delete options.preprocessorIgnorePatterns;403  return options;404};405const normalizeMissingOptions = (options, configPath, projectIndex) => {406  if (!options.name) {407    options.name = (0, _crypto().createHash)('md5')408      .update(options.rootDir) // In case we load config from some path that has the same root dir409      .update(configPath || '')410      .update(String(projectIndex))411      .digest('hex');412  }413  if (!options.setupFiles) {414    options.setupFiles = [];415  }416  return options;417};418const normalizeRootDir = options => {419  // Assert that there *is* a rootDir420  if (!options.rootDir) {421    throw createConfigError(422      `  Configuration option ${_chalk().default.bold(423        'rootDir'424      )} must be specified.`425    );426  }427  options.rootDir = path().normalize(options.rootDir);428  try {429    // try to resolve windows short paths, ignoring errors (permission errors, mostly)430    options.rootDir = (0, _jestUtil().tryRealpath)(options.rootDir);431  } catch {432    // ignored433  }434  verifyDirectoryExists(options.rootDir, 'rootDir');435  return {...options, rootDir: options.rootDir};436};437const normalizeReporters = options => {438  const reporters = options.reporters;439  if (!reporters || !Array.isArray(reporters)) {440    return options;441  }442  (0, _ReporterValidationErrors.validateReporters)(reporters);443  options.reporters = reporters.map(reporterConfig => {444    const normalizedReporterConfig =445      typeof reporterConfig === 'string' // if reporter config is a string, we wrap it in an array446        ? // and pass an empty object for options argument, to normalize447          // the shape.448          [reporterConfig, {}]449        : reporterConfig;450    const reporterPath = (0, _utils.replaceRootDirInPath)(451      options.rootDir,452      normalizedReporterConfig[0]453    );454    if (reporterPath !== _constants.DEFAULT_REPORTER_LABEL) {455      const reporter = _jestResolve().default.findNodeModule(reporterPath, {456        basedir: options.rootDir457      });458      if (!reporter) {459        throw new (_jestResolve().default.ModuleNotFoundError)(460          `Could not resolve a module for a custom reporter.\n` +461            `  Module name: ${reporterPath}`462        );463      }464      normalizedReporterConfig[0] = reporter;465    }466    return normalizedReporterConfig;467  });468  return options;469};470const buildTestPathPattern = argv => {471  const patterns = [];472  if (argv._) {473    patterns.push(...argv._);474  }475  if (argv.testPathPattern) {476    patterns.push(...argv.testPathPattern);477  }478  const replacePosixSep = pattern => {479    // yargs coerces positional args into numbers480    const patternAsString = pattern.toString();481    if (path().sep === '/') {482      return patternAsString;483    }484    return patternAsString.replace(/\//g, '\\\\');485  };486  const testPathPattern = patterns.map(replacePosixSep).join('|');487  if ((0, _validatePattern.default)(testPathPattern)) {488    return testPathPattern;489  } else {490    showTestPathPatternError(testPathPattern);491    return '';492  }493};494const showTestPathPatternError = testPathPattern => {495  (0, _jestUtil().clearLine)(process.stdout);496  console.log(497    _chalk().default.red(498      `  Invalid testPattern ${testPathPattern} supplied. ` +499        `Running all tests instead.`500    )501  );502};503function normalize(initialOptions, argv, configPath, projectIndex = Infinity) {504  const {hasDeprecationWarnings} = (0, _jestValidate().validate)(505    initialOptions,506    {507      comment: _utils.DOCUMENTATION_NOTE,508      deprecatedConfig: _Deprecated.default,509      exampleConfig: _ValidConfig.default,510      recursiveBlacklist: [511        'collectCoverageOnlyFrom', // 'coverageThreshold' allows to use 'global' and glob strings on the same512        // level, there's currently no way we can deal with such config513        'coverageThreshold',514        'globals',515        'moduleNameMapper',516        'testEnvironmentOptions',517        'transform'518      ]519    }520  );521  let options = normalizePreprocessor(522    normalizeReporters(523      normalizeMissingOptions(524        normalizeRootDir((0, _setFromArgv.default)(initialOptions, argv)),525        configPath,526        projectIndex527      )528    )529  );530  if (options.preset) {531    options = setupPreset(options, options.preset);532  }533  if (!options.setupFilesAfterEnv) {534    options.setupFilesAfterEnv = [];535  }536  if (537    options.setupTestFrameworkScriptFile &&538    options.setupFilesAfterEnv.length > 0539  ) {540    throw createConfigError(`  Options: ${_chalk().default.bold(541      'setupTestFrameworkScriptFile'542    )} and ${_chalk().default.bold(543      'setupFilesAfterEnv'544    )} cannot be used together.545  Please change your configuration to only use ${_chalk().default.bold(546    'setupFilesAfterEnv'547  )}.`);548  }549  if (options.setupTestFrameworkScriptFile) {550    options.setupFilesAfterEnv.push(options.setupTestFrameworkScriptFile);551  }552  options.testEnvironment = (0, _utils.getTestEnvironment)({553    rootDir: options.rootDir,554    testEnvironment:555      options.testEnvironment || _Defaults.default.testEnvironment556  });557  if (!options.roots && options.testPathDirs) {558    options.roots = options.testPathDirs;559    delete options.testPathDirs;560  }561  if (!options.roots) {562    options.roots = [options.rootDir];563  }564  if (!options.testRunner || options.testRunner === 'jasmine2') {565    options.testRunner = require.resolve('jest-jasmine2');566  }567  if (!options.coverageDirectory) {568    options.coverageDirectory = path().resolve(options.rootDir, 'coverage');569  }570  setupBabelJest(options); // TODO: Type this properly571  const newOptions = {..._Defaults.default};572  if (options.resolver) {573    newOptions.resolver = (0, _utils.resolve)(null, {574      filePath: options.resolver,575      key: 'resolver',576      rootDir: options.rootDir577    });578  }579  const optionKeys = Object.keys(options);580  optionKeys.reduce((newOptions, key) => {581    // The resolver has been resolved separately; skip it582    if (key === 'resolver') {583      return newOptions;584    } // This is cheating, because it claims that all keys of InitialOptions are Required.585    // We only really know it's Required for oldOptions[key], not for oldOptions.someOtherKey,586    // so oldOptions[key] is the only way it should be used.587    const oldOptions = options;588    let value;589    switch (key) {590      case 'collectCoverageOnlyFrom':591        value = normalizeCollectCoverageOnlyFrom(oldOptions, key);592        break;593      case 'setupFiles':594      case 'setupFilesAfterEnv':595      case 'snapshotSerializers':596        {597          const option = oldOptions[key];598          value =599            option &&600            option.map(filePath =>601              (0, _utils.resolve)(newOptions.resolver, {602                filePath,603                key,604                rootDir: options.rootDir605              })606            );607        }608        break;609      case 'modulePaths':610      case 'roots':611        {612          const option = oldOptions[key];613          value =614            option &&615            option.map(filePath =>616              path().resolve(617                options.rootDir,618                (0, _utils.replaceRootDirInPath)(options.rootDir, filePath)619              )620            );621        }622        break;623      case 'collectCoverageFrom':624        value = normalizeCollectCoverageFrom(oldOptions, key);625        break;626      case 'cacheDirectory':627      case 'coverageDirectory':628        {629          const option = oldOptions[key];630          value =631            option &&632            path().resolve(633              options.rootDir,634              (0, _utils.replaceRootDirInPath)(options.rootDir, option)635            );636        }637        break;638      case 'dependencyExtractor':639      case 'globalSetup':640      case 'globalTeardown':641      case 'moduleLoader':642      case 'snapshotResolver':643      case 'testResultsProcessor':644      case 'testRunner':645      case 'filter':646        {647          const option = oldOptions[key];648          value =649            option &&650            (0, _utils.resolve)(newOptions.resolver, {651              filePath: option,652              key,653              rootDir: options.rootDir654            });655        }656        break;657      case 'runner':658        {659          const option = oldOptions[key];660          value =661            option &&662            (0, _utils.getRunner)(newOptions.resolver, {663              filePath: option,664              rootDir: options.rootDir665            });666        }667        break;668      case 'prettierPath':669        {670          // We only want this to throw if "prettierPath" is explicitly passed671          // from config or CLI, and the requested path isn't found. Otherwise we672          // set it to null and throw an error lazily when it is used.673          const option = oldOptions[key];674          value =675            option &&676            (0, _utils.resolve)(newOptions.resolver, {677              filePath: option,678              key,679              optional: option === _Defaults.default[key],680              rootDir: options.rootDir681            });682        }683        break;684      case 'moduleNameMapper':685        const moduleNameMapper = oldOptions[key];686        value =687          moduleNameMapper &&688          Object.keys(moduleNameMapper).map(regex => {689            const item = moduleNameMapper && moduleNameMapper[regex];690            return (691              item && [692                regex,693                (0, _utils._replaceRootDirTags)(options.rootDir, item)694              ]695            );696          });697        break;698      case 'transform':699        const transform = oldOptions[key];700        value =701          transform &&702          Object.keys(transform).map(regex => {703            const transformElement = transform[regex];704            return [705              regex,706              (0, _utils.resolve)(newOptions.resolver, {707                filePath: Array.isArray(transformElement)708                  ? transformElement[0]709                  : transformElement,710                key,711                rootDir: options.rootDir712              }),713              Array.isArray(transformElement) ? transformElement[1] : {}714            ];715          });716        break;717      case 'coveragePathIgnorePatterns':718      case 'modulePathIgnorePatterns':719      case 'testPathIgnorePatterns':720      case 'transformIgnorePatterns':721      case 'watchPathIgnorePatterns':722      case 'unmockedModulePathPatterns':723        value = normalizeUnmockedModulePathPatterns(oldOptions, key);724        break;725      case 'haste':726        value = {...oldOptions[key]};727        if (value.hasteImplModulePath != null) {728          const resolvedHasteImpl = (0, _utils.resolve)(newOptions.resolver, {729            filePath: (0, _utils.replaceRootDirInPath)(730              options.rootDir,731              value.hasteImplModulePath732            ),733            key: 'haste.hasteImplModulePath',734            rootDir: options.rootDir735          });736          value.hasteImplModulePath = resolvedHasteImpl || undefined;737        }738        break;739      case 'projects':740        value = (oldOptions[key] || [])741          .map(project =>742            typeof project === 'string'743              ? (0, _utils._replaceRootDirTags)(options.rootDir, project)744              : project745          )746          .reduce((projects, project) => {747            // Project can be specified as globs. If a glob matches any files,748            // We expand it to these paths. If not, we keep the original path749            // for the future resolution.750            const globMatches =751              typeof project === 'string' ? (0, _glob().sync)(project) : [];752            return projects.concat(globMatches.length ? globMatches : project);753          }, []);754        break;755      case 'moduleDirectories':756      case 'testMatch':757        {758          const replacedRootDirTags = (0, _utils._replaceRootDirTags)(759            (0, _utils.escapeGlobCharacters)(options.rootDir),760            oldOptions[key]761          );762          if (replacedRootDirTags) {763            value = Array.isArray(replacedRootDirTags)764              ? replacedRootDirTags.map(_jestUtil().replacePathSepForGlob)765              : (0, _jestUtil().replacePathSepForGlob)(replacedRootDirTags);766          } else {767            value = replacedRootDirTags;768          }769        }770        break;771      case 'testRegex':772        {773          const option = oldOptions[key];774          value = option775            ? (Array.isArray(option) ? option : [option]).map(776                _jestRegexUtil().replacePathSepForRegex777              )778            : [];779        }780        break;781      case 'moduleFileExtensions': {782        value = oldOptions[key];783        if (784          Array.isArray(value) && // If it's the wrong type, it can throw at a later time785          (options.runner === undefined ||786            options.runner === _Defaults.default.runner) && // Only require 'js' for the default jest-runner787          !value.includes('js')788        ) {789          const errorMessage =790            `  moduleFileExtensions must include 'js':\n` +791            `  but instead received:\n` +792            `    ${_chalk().default.bold.red(JSON.stringify(value))}`; // If `js` is not included, any dependency Jest itself injects into793          // the environment, like jasmine or sourcemap-support, will need to794          // `require` its modules with a file extension. This is not plausible795          // in the long run, so it's way easier to just fail hard early.796          // We might consider throwing if `json` is missing as well, as it's a797          // fair assumption from modules that they can do798          // `require('some-package/package') without the trailing `.json` as it799          // works in Node normally.800          throw createConfigError(801            errorMessage +802              "\n  Please change your configuration to include 'js'."803          );804        }805        break;806      }807      case 'bail': {808        const bail = oldOptions[key];809        if (typeof bail === 'boolean') {810          value = bail ? 1 : 0;811        } else if (typeof bail === 'string') {812          value = 1; // If Jest is invoked as `jest --bail someTestPattern` then need to813          // move the pattern from the `bail` configuration and into `argv._`814          // to be processed as an extra parameter815          argv._.push(bail);816        } else {817          value = oldOptions[key];818        }819        break;820      }821      case 'displayName': {822        const displayName = oldOptions[key];823        /**824         * Ensuring that displayName shape is correct here so that the825         * reporters can trust the shape of the data826         */827        if (typeof displayName === 'object') {828          const {name, color} = displayName;829          if (830            !name ||831            !color ||832            typeof name !== 'string' ||833            typeof color !== 'string'834          ) {835            const errorMessage =836              `  Option "${_chalk().default.bold(837                'displayName'838              )}" must be of type:\n\n` +839              '  {\n' +840              '    name: string;\n' +841              '    color: string;\n' +842              '  }\n';843            throw createConfigError(errorMessage);844          }845          value = oldOptions[key];846        } else {847          value = {848            color: (0, _color.getDisplayNameColor)(options.runner),849            name: displayName850          };851        }852        break;853      }854      case 'testTimeout': {855        if (oldOptions[key] < 0) {856          throw createConfigError(857            `  Option "${_chalk().default.bold(858              'testTimeout'859            )}" must be a natural number.`860          );861        }862        value = oldOptions[key];863        break;864      }865      case 'automock':866      case 'cache':867      case 'changedSince':868      case 'changedFilesWithAncestor':869      case 'clearMocks':870      case 'collectCoverage':871      case 'coverageProvider':872      case 'coverageReporters':873      case 'coverageThreshold':874      case 'detectLeaks':875      case 'detectOpenHandles':876      case 'errorOnDeprecated':877      case 'expand':878      case 'extraGlobals':879      case 'globals':880      case 'findRelatedTests':881      case 'forceCoverageMatch':882      case 'forceExit':883      case 'injectGlobals':884      case 'lastCommit':885      case 'listTests':886      case 'logHeapUsage':887      case 'maxConcurrency':888      case 'mapCoverage':889      case 'name':890      case 'noStackTrace':891      case 'notify':892      case 'notifyMode':893      case 'onlyChanged':894      case 'onlyFailures':895      case 'outputFile':896      case 'passWithNoTests':897      case 'replname':898      case 'reporters':899      case 'resetMocks':900      case 'resetModules':901      case 'restoreMocks':902      case 'rootDir':903      case 'runTestsByPath':904      case 'silent':905      case 'skipFilter':906      case 'skipNodeResolution':907      case 'slowTestThreshold':908      case 'testEnvironment':909      case 'testEnvironmentOptions':910      case 'testFailureExitCode':911      case 'testLocationInResults':912      case 'testNamePattern':913      case 'testURL':914      case 'timers':915      case 'useStderr':916      case 'verbose':917      case 'watch':918      case 'watchAll':919      case 'watchman':920        value = oldOptions[key];921        break;922      case 'watchPlugins':923        value = (oldOptions[key] || []).map(watchPlugin => {924          if (typeof watchPlugin === 'string') {925            return {926              config: {},927              path: (0, _utils.getWatchPlugin)(newOptions.resolver, {928                filePath: watchPlugin,929                rootDir: options.rootDir930              })931            };932          } else {933            return {934              config: watchPlugin[1] || {},935              path: (0, _utils.getWatchPlugin)(newOptions.resolver, {936                filePath: watchPlugin[0],937                rootDir: options.rootDir938              })939            };940          }941        });942        break;943    } // @ts-expect-error: automock is missing in GlobalConfig, so what944    newOptions[key] = value;945    return newOptions;946  }, newOptions);947  newOptions.roots.forEach((root, i) => {948    verifyDirectoryExists(root, `roots[${i}]`);949  });950  try {951    // try to resolve windows short paths, ignoring errors (permission errors, mostly)952    newOptions.cwd = (0, _jestUtil().tryRealpath)(process.cwd());953  } catch {954    // ignored955  }956  newOptions.testSequencer = (0, _utils.getSequencer)(newOptions.resolver, {957    filePath: options.testSequencer || _Defaults.default.testSequencer,958    rootDir: options.rootDir959  });960  newOptions.nonFlagArgs = argv._;961  newOptions.testPathPattern = buildTestPathPattern(argv);962  newOptions.json = !!argv.json;...

index.js

Source:index.js

...217  const fileContents = await fsPromises.readFile(configFile, { encoding: 'utf-8' });218  const json = JSON.parse(fileContents);219  return json;220}221function verifyDirectoryExists(directory) {222  return new Promise((resolve, reject) => {223    fsPromises224      .access(directory, fs.constants.F_OK || fs.constants.W_OK)225      .then(() => resolve())226      .catch((error) => {227        console.error(`Directory "${directory}" don't exists`);228        reject(error);229      });230  });231}232function getArgv() {233  const { argv } = yargs(hideBin(process.argv))234    .option('directory', {235      alias: 'd',236      type: 'string',237      description: 'Directory to look for files',238      demandOption: 'Please specify a directory to look for files'239    })240    .option('config', {241      alias: 'c',242      type: 'string',243      description: 'Configuration file (JSON)',244      demandOption: 'Please specify a config file'245    })246    .usage('Usage: $0 -d [directory] -c [config file]')247    .demandOption(['d', 'c']);248  return argv;249}250async function main() {251  const argv = getArgv();252  try {253    await verifyDirectoryExists(argv.directory);254    const config = await parseConfigFile(argv.config);255    const files = await readAllFilesRecursivelly('**/*.mkv', argv.directory);256    await Promise.all(257      Object.entries(config.episodes).map(async ([episodeIdentifier, episodeName]) =>258        lookup(config.meta, files, episodeIdentifier, episodeName)259      )260    );261    console.table(tableItems);262  } catch (er) {263    console.error(er);264  }265  console.log('<<<END>>>');266}267main();

DownloadContent.js

Source:DownloadContent.js

...68   * @return {Promise<{type:string,name:string,data:[]}>}69   */70  async scrape({ html, url }) {71    if (!this.directoryVerified) {72      await verifyDirectoryExists(73        this.config.filePath || this.scraper.config.filePath74      );75      this.directoryVerified = true;76    }77    this.config.contentType = this.config.contentType || "image";78    var $ = cheerio.load(html);79    const baseUrlFromBaseTag = getBaseUrlFromBaseTag(80      $,81      this.scraper.config.baseSiteUrl82    );83    const elementList = await createElementList($, this.querySelector, {84      condition: this.config.condition,85      slice: this.config.slice,86    });...

Scraper.js

Source:Scraper.js

...167     * @param {string} fileName  168     * @return {Promise<void>}  169     */170    saveFile(data, fileName) {171        // verifyDirectoryExists(this.config.logPath);172        return new Promise(async (resolve, reject) => {173            await verifyDirectoryExists(this.config.logPath);174            // this.log('saving file')175            // debugger;176            fs.writeFile(path.join(this.config.logPath, `${fileName}.json`), JSON.stringify(data), (error) => {177                if (error) {178                    reject(error)179                } else {180                    this.log(`Log file ${fileName} saved`);181                    resolve();182                }183            });184        })185    }186    /**187     * @return {Promise<void>}...

files.js

Source:files.js

1const fs = require('fs');2// const {promisify} = require('util');3// const access = promisify(fs.access);4// const mkdir = promisify(fs.mkdir);5function verifyDirectoryExists(path) {//Will make sure the target directory exists.   6    if (!fs.existsSync(path)) {7        // console.log('creating dir:', path)8        fs.mkdirSync(path,{recursive:true});9    }10}11// async function verifyDirectoryExists(path){12        13//         try {14//             await access(path);     15//         } catch (error) {16//             console.log('error from verify',error)17//             try {18//                 await mkdir(path);    19//             } catch (error) {20//                 if(error.code !== 'EEXIST'){21//                     throw error;22//                 }23//                 // debugger24//             }25            ...

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.