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How to use buildArgv method in Jest

Best JavaScript code snippet using jest

index.js

Source:index.js

...118 * LICENSE file in the root directory of this source tree.119 */120async function run(maybeArgv, project) {121  try {122    const argv = buildArgv(maybeArgv);123    if (argv.init) {124      await (0, _init().default)();125      return;126    }127    const projects = getProjectListFromCLIArgs(argv, project);128    const {results, globalConfig} = await (0, _core().runCLI)(argv, projects);129    readResultsAndExit(results, globalConfig);130  } catch (error) {131    (0, _jestUtil().clearLine)(process.stderr);132    (0, _jestUtil().clearLine)(process.stdout);133    if (error.stack) {134      console.error(_chalk().default.red(error.stack));135    } else {136      console.error(_chalk().default.red(error));...

cli-parameters.js

Source:cli-parameters.js

...5var processNodeEnv;6/**7 * Builds a valid ARGV array with passed arguments.8 */9function buildArgv(args) {10  var argv = ['/somewhere/node', '/somewhere/selenium-standalone'];11  if (args) {12    argv = argv.concat(args);13  }14  return argv;15}16/**17 * Tests for `selenium-standalone` command parameters parsing.18 */19describe('`selenium-standalone` command parameters', function() {20  // Allow tests to mock `process.platform`21  before(function() {22    this.originalArgv = Object.getOwnPropertyDescriptor(process, 'argv');23  });24  after(function() {25    Object.defineProperty(process, 'argv', this.originalArgv);26  });27  // Ensure that any internal state of the module is clean for each test28  beforeEach(function() {29    if (process.env) {30      processNodeEnv = process.env.NODE_ENV;31      process.env.NODE_ENV = 'test-cli-parameters';32    } else {33      process.env = { NODE_ENV: 'test-cli-parameters' };34    }35    parseCommandAndOptions = require('../bin/selenium-standalone').bind(null, '/path/to/java');36  });37  afterEach(function() {38    delete require.cache[require.resolve('../bin/selenium-standalone')];39    if (processNodeEnv) {40      process.env.NODE_ENV = processNodeEnv;41    } else {42      delete process.env.NODE_ENV;43    }44  });45  describe('action', function() {46    it('is required', function() {47      process.argv = buildArgv();48      expect(parseCommandAndOptions)49        .to.throw(/^No action provided$/);50    });51    it('only accepts valid values', function() {52      process.argv = buildArgv(['test']);53      expect(parseCommandAndOptions).to.throw(/^Invalid action /);54      process.argv = buildArgv(['install']);55      expect(parseCommandAndOptions).to.not.throw();56      process.argv = buildArgv(['start']);57      expect(parseCommandAndOptions).to.not.throw();58    });59  });60  describe('arguments', function() {61    it('are correctly parsed', function() {62      process.argv = buildArgv([63        'install',64        '--test=1',65        '-a', 'ok',66        '-h'67      ]);68      var parsed = parseCommandAndOptions();69      expect(parsed[1].test).to.be.equal(1);70      expect(parsed[1].a).to.be.equal('ok');71      expect(parsed[1].h).to.be.true;72    });73    it('are correctly passed unparsed to selenium when after --', function() {74      process.argv = buildArgv([75        'install',76        '--test=1',77        '--',78        '--test=1',79        '-a', 'ok',80        '-h',81      ]);82      var parsed = parseCommandAndOptions();83      expect(parsed[1].test).to.be.equal(1);84      expect(parsed[1].a).to.be.undefined;85      expect(parsed[1].seleniumArgs).to.deep.equal(['--test=1', '-a', 'ok', '-h']);86    });87    it('takes default values when not specified', function() {88      process.argv = buildArgv(['install']);89      var parsed1 = parseCommandAndOptions('/somewhere');90      var defaultValues = require('../lib/default-config');91      Object.keys(defaultValues).forEach(function(key) {92        expect(parsed1[1][key]).to.deep.equal(defaultValues[key]);93      });94      process.argv = buildArgv(['install', '--drivers.chrome.version=42']);95      var parsed2 = parseCommandAndOptions('/somewhere');96      expect(parsed2[1].drivers.chrome.version).to.be.equal('42');97      expect(parsed2[1].drivers.chrome.baseURL)98        .to.be.equal(defaultValues.drivers.chrome.baseURL);99    });100    it('are correctly parsed from a JSON config file', function() {101      process.argv = buildArgv([102        'install',103        '--config=' + path.join(__dirname, 'fixtures', 'config.valid.json'),104      ]);105      var parsed = parseCommandAndOptions('/somewhere');106      expect(parsed[1].version).to.be.equal('42');107      expect(parsed[1].drivers.ie.version).to.be.equal(42);108      expect(parsed[1].drivers.ie.baseURL).to.be.equal('http://www.google.fr');109      expect(parsed[1].seleniumArgs).to.be.deep.equal([]);110    });111    it('are correctly parsed from a JS module config file', function() {112      process.argv = buildArgv([113        'install',114        '--config=' + path.join(__dirname, 'fixtures', 'config.valid.js'),115      ]);116      var parsed = parseCommandAndOptions('/somewhere');117      expect(parsed[1].version).to.be.equal('42');118      expect(parsed[1].drivers.ie.version).to.be.equal(42);119      expect(parsed[1].drivers.ie.baseURL).to.be.equal('http://www.google.fr');120      expect(parsed[1].seleniumArgs).to.be.deep.equal(['--test=1', '-flag']);121    });122    it('throws if config file is invalid', function() {123      process.argv = buildArgv([124        'install',125        '--config=' + path.join(__dirname, 'fixtures', 'config.invalid.json'),126      ]);127      expect(parseCommandAndOptions).to.throw(/^Error parsing config file :/);128    });129    it('throws if config file is not an object', function() {130      process.argv = buildArgv([131        'install',132        '--config=' + path.join(__dirname, 'fixtures', 'config.invalid.js'),133      ]);134      expect(parseCommandAndOptions).to.throw(/^Error parsing config file : Config file does not exports an object$/);135    });136    it('respects the precedence order : command line > config file > default', function() {137      var defaultValues = require('../lib/default-config');138      process.argv = buildArgv([139        'install',140        '--config=' + path.join(__dirname, 'fixtures', 'config.valid.js'),141        '--drivers.ie.version=43',142        '--',143        '--some=seleniumArgs'144      ]);145      var parsed = parseCommandAndOptions('/somewhere');146      expect(parsed[1].version).to.be.equal('42');147      expect(parsed[1].drivers.ie.arch).to.be.equal(defaultValues.drivers.ie.arch);148      expect(parsed[1].drivers.ie.version).to.be.equal('43');149      expect(parsed[1].seleniumArgs).to.be.deep.equal(['--some=seleniumArgs']);150    });151  });152});

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Unit Testing with Jest - Step-by-step tutorial to help you execute unit testing with Jest framework.
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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.
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Jest FAQs(Frequently Asked Questions) - Explore the most commonly asked questions around Jest framework, with their answers.