Best JavaScript code snippet using jest
CopyrightUtils.js
Source:CopyrightUtils.js  
...107      !micromatch.isMatch(file, excludePatterns) &&108      existsSync(file) &&109      !lstatSync(file).isDirectory() &&110      !isBinaryFileSync(file) &&111      needsCopyrightHeader(copyrightText, file),112  );113};114export const getFilesWithCopyrightHeader = ({115  extensions = [],116  /* micromatch glob patterns */117  excludePatterns = [],118  copyrightText,119}) => {120  const files = execSync('git ls-files', { encoding: 'utf-8' })121    .trim()122    .split('\n');123  const includePatterns = getIncludedPatterns({ extensions });124  return files.filter(125    (file) =>...check-license-headers.js
Source:check-license-headers.js  
...109    // Any file with an extension110    /\.[^/]+$/,111];112const COPYRIGHT_HEADER_RE = /Copyright (\(c\))? [0-9]{4}, (s|S)alesforce.com, inc./;113function needsCopyrightHeader(file) {114    const contents = getFileContents(file);115    return contents.trim().length > 0 && !COPYRIGHT_HEADER_RE.test(contents);116}117function check() {118    const allFiles = execSync('git ls-files', { encoding: 'utf-8' }).trim().split('\n');119    const invalidFiles = allFiles.filter(120        (file) =>121            INCLUDED_PATTERNS.some((pattern) => pattern.test(file)) &&122            !IGNORED_PATTERNS.some((pattern) => pattern.test(file)) &&123            !isDirectory(file) &&124            !isBinaryFileSync(file) &&125            needsCopyrightHeader(file)126    );127    if (invalidFiles.length > 0) {128        console.log(`Salesforce copyright header check failed for the following files:129  ${invalidFiles.join('\n  ')}130Please include the header or add an exception for the file in \`scripts/checkCopyrightHeaders.js\``);131        process.exit(1);132    }133}...checkLicenseHeaders.js
Source:checkLicenseHeaders.js  
...105  // Any file with an extension106  /\.[^/]+$/,107];108const COPYRIGHT_HEADER_RE = /Copyright (\(c\))? [0-9]{4}, (s|S)alesforce.com, inc./;109function needsCopyrightHeader(file) {110  const contents = getFileContents(file);111  return contents.trim().length > 0 && !COPYRIGHT_HEADER_RE.test(contents);112}113function check() {114  const allFiles = execSync('git ls-files', {encoding: 'utf-8'})115    .trim()116    .split('\n');117  const invalidFiles = allFiles.filter(118    file =>119      INCLUDED_PATTERNS.some(pattern => pattern.test(file)) &&120      !IGNORED_PATTERNS.some(pattern => pattern.test(file)) &&121      !isDirectory(file) &&122      !isBinaryFileSync(file) &&123      needsCopyrightHeader(file)124  );125  if (invalidFiles.length > 0) {126    console.log(`Salesforce copyright header check failed for the following files:127  ${invalidFiles.join('\n  ')}128Please include the header or blacklist the files in \`scripts/checkCopyrightHeaders.js\``);129    process.exit(1);130  }131}...checkCopyrightHeaders.js
Source:checkCopyrightHeaders.js  
...104  /\.[^/]+$/,105];106const COPYRIGHT_HEADER =107  'Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.';108function needsCopyrightHeader(file) {109  const contents = getFileContents(file);110  return contents.trim().length > 0 && !contents.includes(COPYRIGHT_HEADER);111}112function check() {113  const allFiles = execSync('git ls-files', {encoding: 'utf-8'})114    .trim()115    .split('\n');116  const invalidFiles = allFiles.filter(117    file =>118      INCLUDED_PATTERNS.some(pattern => pattern.test(file)) &&119      !IGNORED_PATTERNS.some(pattern => pattern.test(file)) &&120      !isDirectory(file) &&121      !isBinaryFileSync(file) &&122      needsCopyrightHeader(file)123  );124  if (invalidFiles.length > 0) {125    console.log(`Facebook copyright header check failed for the following files:126  ${invalidFiles.join('\n  ')}127Please include the header or blacklist the files in \`scripts/checkCopyrightHeaders.js\``);128    process.exit(1);129  }130}...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.
|<p>it('check_object_of_Car', () => {</p><p>    expect(newCar()).toBeInstanceOf(Car);</p><p> });</p>|
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