KaneAI - World’s First E2E Software Testing Agent.Signup for Private Beta Join TestMu Conference

How to use joinForPattern method in Jest

Best JavaScript code snippet using jest

normalize.test.js

Source:normalize.test.js

...28});29// Windows uses backslashes for path separators, which need to be escaped in30// regular expressions. This little helper function helps us generate the31// expected strings for checking path patterns.32function joinForPattern() {33  return Array.prototype.join.call(34    arguments,35    utils.escapeStrForRegex(path.sep),36  );37}38beforeEach(() => {39  root = path.resolve('/');40  expectedPathFooBar = path.join(root, 'root', 'path', 'foo', 'bar', 'baz');41  expectedPathFooQux = path.join(root, 'root', 'path', 'foo', 'qux', 'quux');42  expectedPathAbs = path.join(root, 'an', 'abs', 'path');43  expectedPathAbsAnother = path.join(root, 'another', 'abs', 'path');44  require('jest-resolve').findNodeModule = findNodeModule;45});46it('picks a name based on the rootDir', () => {47  const rootDir = '/root/path/foo';48  const expected = crypto49    .createHash('md5')50    .update('/root/path/foo')51    .digest('hex');52  expect(53    normalize(54      {55        rootDir,56      },57      {},58    ).options.name,59  ).toBe(expected);60});61it('keeps custom names based on the rootDir', () => {62  expect(63    normalize(64      {65        name: 'custom-name',66        rootDir: '/root/path/foo',67      },68      {},69    ).options.name,70  ).toBe('custom-name');71});72it('sets coverageReporters correctly when argv.json is set', () => {73  expect(74    normalize(75      {76        rootDir: '/root/path/foo',77      },78      {79        json: true,80      },81    ).options.coverageReporters,82  ).toEqual(['json', 'lcov', 'clover']);83});84describe('rootDir', () => {85  it('throws if the options is missing a rootDir property', () => {86    expect(() => {87      normalize({}, {});88    }).toThrowErrorMatchingSnapshot();89  });90});91describe('automock', () => {92  it('falsy automock is not overwritten', () => {93    const consoleWarn = console.warn;94    console.warn = jest.fn();95    const {options} = normalize(96      {97        automock: false,98        rootDir: '/root/path/foo',99      },100      {},101    );102    expect(options.automock).toBe(false);103    console.warn = consoleWarn;104  });105});106describe('browser', () => {107  it('falsy browser is not overwritten', () => {108    const {options} = normalize(109      {110        browser: true,111        rootDir: '/root/path/foo',112      },113      {},114    );115    expect(options.browser).toBe(true);116  });117});118describe('collectCoverageOnlyFrom', () => {119  it('normalizes all paths relative to rootDir', () => {120    const {options} = normalize(121      {122        collectCoverageOnlyFrom: {123          'bar/baz': true,124          'qux/quux/': true,125        },126        rootDir: '/root/path/foo/',127      },128      {},129    );130    const expected = {};131    expected[expectedPathFooBar] = true;132    expected[expectedPathFooQux] = true;133    expect(options.collectCoverageOnlyFrom).toEqual(expected);134  });135  it('does not change absolute paths', () => {136    const {options} = normalize(137      {138        collectCoverageOnlyFrom: {139          '/an/abs/path': true,140          '/another/abs/path': true,141        },142        rootDir: '/root/path/foo',143      },144      {},145    );146    const expected = {};147    expected[expectedPathAbs] = true;148    expected[expectedPathAbsAnother] = true;149    expect(options.collectCoverageOnlyFrom).toEqual(expected);150  });151  it('substitutes <rootDir> tokens', () => {152    const {options} = normalize(153      {154        collectCoverageOnlyFrom: {155          '<rootDir>/bar/baz': true,156        },157        rootDir: '/root/path/foo',158      },159      {},160    );161    const expected = {};162    expected[expectedPathFooBar] = true;163    expect(options.collectCoverageOnlyFrom).toEqual(expected);164  });165});166function testPathArray(key) {167  it('normalizes all paths relative to rootDir', () => {168    const {options} = normalize(169      {170        [key]: ['bar/baz', 'qux/quux/'],171        rootDir: '/root/path/foo',172      },173      {},174    );175    expect(options[key]).toEqual([expectedPathFooBar, expectedPathFooQux]);176  });177  it('does not change absolute paths', () => {178    const {options} = normalize(179      {180        [key]: ['/an/abs/path', '/another/abs/path'],181        rootDir: '/root/path/foo',182      },183      {},184    );185    expect(options[key]).toEqual([expectedPathAbs, expectedPathAbsAnother]);186  });187  it('substitutes <rootDir> tokens', () => {188    const {options} = normalize(189      {190        [key]: ['<rootDir>/bar/baz'],191        rootDir: '/root/path/foo',192      },193      {},194    );195    expect(options[key]).toEqual([expectedPathFooBar]);196  });197}198describe('roots', () => {199  testPathArray('roots');200});201describe('transform', () => {202  let Resolver;203  beforeEach(() => {204    Resolver = require('jest-resolve');205    Resolver.findNodeModule = jest.fn(name => name);206  });207  it('normalizes the path', () => {208    const {options} = normalize(209      {210        rootDir: '/root/',211        transform: {212          [DEFAULT_CSS_PATTERN]: '<rootDir>/node_modules/jest-regex-util',213          [DEFAULT_JS_PATTERN]: 'babel-jest',214          'abs-path': '/qux/quux',215        },216      },217      {},218    );219    expect(options.transform).toEqual([220      [DEFAULT_CSS_PATTERN, '/root/node_modules/jest-regex-util'],221      [DEFAULT_JS_PATTERN, 'babel-jest'],222      ['abs-path', '/qux/quux'],223    ]);224  });225});226describe('haste', () => {227  let Resolver;228  beforeEach(() => {229    Resolver = require('jest-resolve');230    Resolver.findNodeModule = jest.fn(name => name);231  });232  it('normalizes the path for hasteImplModulePath', () => {233    const {options} = normalize(234      {235        haste: {236          hasteImplModulePath: '<rootDir>/haste_impl.js',237        },238        rootDir: '/root/',239      },240      {},241    );242    expect(options.haste).toEqual({243      hasteImplModulePath: '/root/haste_impl.js',244    });245  });246});247describe('setupTestFrameworkScriptFile', () => {248  let Resolver;249  beforeEach(() => {250    Resolver = require('jest-resolve');251    Resolver.findNodeModule = jest.fn(252      name =>253        name.startsWith('/') ? name : '/root/path/foo' + path.sep + name,254    );255  });256  it('normalizes the path according to rootDir', () => {257    const {options} = normalize(258      {259        rootDir: '/root/path/foo',260        setupTestFrameworkScriptFile: 'bar/baz',261      },262      {},263    );264    expect(options.setupTestFrameworkScriptFile).toEqual(expectedPathFooBar);265  });266  it('does not change absolute paths', () => {267    const {options} = normalize(268      {269        rootDir: '/root/path/foo',270        setupTestFrameworkScriptFile: '/an/abs/path',271      },272      {},273    );274    expect(options.setupTestFrameworkScriptFile).toEqual(expectedPathAbs);275  });276  it('substitutes <rootDir> tokens', () => {277    const {options} = normalize(278      {279        rootDir: '/root/path/foo',280        setupTestFrameworkScriptFile: '<rootDir>/bar/baz',281      },282      {},283    );284    expect(options.setupTestFrameworkScriptFile).toEqual(expectedPathFooBar);285  });286});287describe('coveragePathIgnorePatterns', () => {288  it('does not normalize paths relative to rootDir', () => {289    // This is a list of patterns, so we can't assume any of them are290    // directories291    const {options} = normalize(292      {293        coveragePathIgnorePatterns: ['bar/baz', 'qux/quux'],294        rootDir: '/root/path/foo',295      },296      {},297    );298    expect(options.coveragePathIgnorePatterns).toEqual([299      joinForPattern('bar', 'baz'),300      joinForPattern('qux', 'quux'),301    ]);302  });303  it('does not normalize trailing slashes', () => {304    // This is a list of patterns, so we can't assume any of them are305    // directories306    const {options} = normalize(307      {308        coveragePathIgnorePatterns: ['bar/baz', 'qux/quux/'],309        rootDir: '/root/path/foo',310      },311      {},312    );313    expect(options.coveragePathIgnorePatterns).toEqual([314      joinForPattern('bar', 'baz'),315      joinForPattern('qux', 'quux', ''),316    ]);317  });318  it('substitutes <rootDir> tokens', () => {319    const {options} = normalize(320      {321        coveragePathIgnorePatterns: ['hasNoToken', '<rootDir>/hasAToken'],322        rootDir: '/root/path/foo',323      },324      {},325    );326    expect(options.coveragePathIgnorePatterns).toEqual([327      'hasNoToken',328      joinForPattern('', 'root', 'path', 'foo', 'hasAToken'),329    ]);330  });331});332describe('watchPathIgnorePatterns', () => {333  it('does not normalize paths relative to rootDir', () => {334    // This is a list of patterns, so we can't assume any of them are335    // directories336    const {options} = normalize(337      {338        rootDir: '/root/path/foo',339        watchPathIgnorePatterns: ['bar/baz', 'qux/quux'],340      },341      {},342    );343    expect(options.watchPathIgnorePatterns).toEqual([344      joinForPattern('bar', 'baz'),345      joinForPattern('qux', 'quux'),346    ]);347  });348  it('does not normalize trailing slashes', () => {349    // This is a list of patterns, so we can't assume any of them are350    // directories351    const {options} = normalize(352      {353        rootDir: '/root/path/foo',354        watchPathIgnorePatterns: ['bar/baz', 'qux/quux/'],355      },356      {},357    );358    expect(options.watchPathIgnorePatterns).toEqual([359      joinForPattern('bar', 'baz'),360      joinForPattern('qux', 'quux', ''),361    ]);362  });363  it('substitutes <rootDir> tokens', () => {364    const {options} = normalize(365      {366        rootDir: '/root/path/foo',367        watchPathIgnorePatterns: ['hasNoToken', '<rootDir>/hasAToken'],368      },369      {},370    );371    expect(options.watchPathIgnorePatterns).toEqual([372      'hasNoToken',373      joinForPattern('', 'root', 'path', 'foo', 'hasAToken'),374    ]);375  });376});377describe('testPathIgnorePatterns', () => {378  it('does not normalize paths relative to rootDir', () => {379    // This is a list of patterns, so we can't assume any of them are380    // directories381    const {options} = normalize(382      {383        rootDir: '/root/path/foo',384        testPathIgnorePatterns: ['bar/baz', 'qux/quux'],385      },386      {},387    );388    expect(options.testPathIgnorePatterns).toEqual([389      joinForPattern('bar', 'baz'),390      joinForPattern('qux', 'quux'),391    ]);392  });393  it('does not normalize trailing slashes', () => {394    // This is a list of patterns, so we can't assume any of them are395    // directories396    const {options} = normalize(397      {398        rootDir: '/root/path/foo',399        testPathIgnorePatterns: ['bar/baz', 'qux/quux/'],400      },401      {},402    );403    expect(options.testPathIgnorePatterns).toEqual([404      joinForPattern('bar', 'baz'),405      joinForPattern('qux', 'quux', ''),406    ]);407  });408  it('substitutes <rootDir> tokens', () => {409    const {options} = normalize(410      {411        rootDir: '/root/path/foo',412        testPathIgnorePatterns: ['hasNoToken', '<rootDir>/hasAToken'],413      },414      {},415    );416    expect(options.testPathIgnorePatterns).toEqual([417      'hasNoToken',418      joinForPattern('', 'root', 'path', 'foo', 'hasAToken'),419    ]);420  });421});422describe('modulePathIgnorePatterns', () => {423  it('does not normalize paths relative to rootDir', () => {424    // This is a list of patterns, so we can't assume any of them are425    // directories426    const {options} = normalize(427      {428        modulePathIgnorePatterns: ['bar/baz', 'qux/quux'],429        rootDir: '/root/path/foo',430      },431      {},432    );433    expect(options.modulePathIgnorePatterns).toEqual([434      joinForPattern('bar', 'baz'),435      joinForPattern('qux', 'quux'),436    ]);437  });438  it('does not normalize trailing slashes', () => {439    // This is a list of patterns, so we can't assume any of them are440    // directories441    const {options} = normalize(442      {443        modulePathIgnorePatterns: ['bar/baz', 'qux/quux/'],444        rootDir: '/root/path/foo',445      },446      {},447    );448    expect(options.modulePathIgnorePatterns).toEqual([449      joinForPattern('bar', 'baz'),450      joinForPattern('qux', 'quux', ''),451    ]);452  });453  it('substitutes <rootDir> tokens', () => {454    const {options} = normalize(455      {456        modulePathIgnorePatterns: ['hasNoToken', '<rootDir>/hasAToken'],457        rootDir: '/root/path/foo',458      },459      {},460    );461    expect(options.modulePathIgnorePatterns).toEqual([462      'hasNoToken',463      joinForPattern('', 'root', 'path', 'foo', 'hasAToken'),464    ]);465  });466});467describe('testRunner', () => {468  it('defaults to Jasmine 2', () => {469    const {options} = normalize(470      {471        rootDir: '/root/path/foo',472      },473      {},474    );475    expect(options.testRunner).toMatch('jasmine2');476  });477  it('is overwritten by argv', () => {478    const Resolver = require('jest-resolve');479    Resolver.findNodeModule = jest.fn(name => name);480    const {options} = normalize(481      {482        rootDir: '/root/path/foo',483      },484      {485        testRunner: 'jasmine1',486      },487    );488    expect(options.testRunner).toBe('jasmine1');489  });490});491describe('coverageDirectory', () => {492  it('defaults to <rootDir>/coverage', () => {493    const {options} = normalize(494      {495        rootDir: '/root/path/foo',496      },497      {},498    );499    expect(options.coverageDirectory).toBe('/root/path/foo/coverage');500  });501});502describe('testEnvironment', () => {503  let Resolver;504  beforeEach(() => {505    Resolver = require('jest-resolve');506    Resolver.findNodeModule = jest.fn(name => {507      if (name === 'jsdom') {508        return 'node_modules/jsdom';509      }510      if (name === 'jest-environment-jsdom') {511        return 'node_modules/jest-environment-jsdom';512      }513      return findNodeModule(name);514    });515  });516  it('resolves to an environment and prefers jest-environment-`name`', () => {517    const {options} = normalize(518      {519        rootDir: '/root',520        testEnvironment: 'jsdom',521      },522      {},523    );524    expect(options.testEnvironment).toEqual(525      'node_modules/jest-environment-jsdom',526    );527  });528  it('throws on invalid environment names', () => {529    expect(() =>530      normalize(531        {532          rootDir: '/root',533          testEnvironment: 'phantom',534        },535        {},536      ),537    ).toThrowErrorMatchingSnapshot();538  });539});540describe('babel-jest', () => {541  let Resolver;542  beforeEach(() => {543    Resolver = require('jest-resolve');544    Resolver.findNodeModule = jest.fn(545      name => path.sep + 'node_modules' + path.sep + name,546    );547  });548  it('correctly identifies and uses babel-jest', () => {549    const {options} = normalize(550      {551        rootDir: '/root',552      },553      {},554    );555    expect(options.transform[0][0]).toBe(DEFAULT_JS_PATTERN);556    expect(options.transform[0][1]).toEqual(557      path.sep + 'node_modules' + path.sep + 'babel-jest',558    );559    expect(options.setupFiles).toEqual([560      path.sep +561        'node_modules' +562        path.sep +563        'regenerator-runtime' +564        path.sep +565        'runtime',566    ]);567  });568  it('uses babel-jest if babel-jest is explicitly specified in a custom transform options', () => {569    const customJSPattern = '^.+\\.js$';570    const {options} = normalize(571      {572        rootDir: '/root',573        transform: {574          [customJSPattern]: 'babel-jest',575        },576      },577      {},578    );579    expect(options.transform[0][0]).toBe(customJSPattern);580    expect(options.transform[0][1]).toEqual('/node_modules/babel-jest');581    expect(options.setupFiles).toEqual([582      path.sep +583        'node_modules' +584        path.sep +585        'regenerator-runtime' +586        path.sep +587        'runtime',588    ]);589  });590  it(`doesn't use babel-jest if its not available`, () => {591    Resolver.findNodeModule = findNodeModule;592    const {options} = normalize(593      {594        rootDir: '/root',595      },596      {},597    );598    expect(options.transform).toEqual(undefined);599    expect(options.setupFiles).toEqual([]);600  });601  it('uses regenerator if babel-jest is explicitly specified', () => {602    const ROOT_DIR = '<rootDir>' + path.sep;603    const {options} = normalize(604      {605        rootDir: '/root',606        transform: {607          [DEFAULT_JS_PATTERN]:608            ROOT_DIR + Resolver.findNodeModule('babel-jest'),609        },610      },611      {},612    );613    expect(options.setupFiles).toEqual([614      path.sep +615        'node_modules' +616        path.sep +617        'regenerator-runtime' +618        path.sep +619        'runtime',620    ]);621  });622});623describe('Upgrade help', () => {624  let consoleWarn;625  beforeEach(() => {626    consoleWarn = console.warn;627    console.warn = jest.fn();628    const Resolver = require('jest-resolve');629    Resolver.findNodeModule = jest.fn(name => {630      if (name == 'bar/baz') {631        return '/node_modules/bar/baz';632      }633      return findNodeModule(name);634    });635  });636  afterEach(() => {637    console.warn = consoleWarn;638  });639  it('logs a warning when `scriptPreprocessor` and/or `preprocessorIgnorePatterns` are used', () => {640    const {options: options, hasDeprecationWarnings} = normalize(641      {642        preprocessorIgnorePatterns: ['bar/baz', 'qux/quux'],643        rootDir: '/root/path/foo',644        scriptPreprocessor: 'bar/baz',645      },646      {},647    );648    expect(options.transform).toEqual([['.*', '/node_modules/bar/baz']]);649    expect(options.transformIgnorePatterns).toEqual([650      joinForPattern('bar', 'baz'),651      joinForPattern('qux', 'quux'),652    ]);653    expect(options.scriptPreprocessor).toBe(undefined);654    expect(options.preprocessorIgnorePatterns).toBe(undefined);655    expect(hasDeprecationWarnings).toBeTruthy();656    expect(console.warn.mock.calls[0][0]).toMatchSnapshot();657  });658});659describe('testMatch', () => {660  it('testMatch default not applied if testRegex is set', () => {661    const {options} = normalize(662      {663        rootDir: '/root',664        testRegex: '.*',665      },...

normalize-test.js

Source:normalize-test.js

...22let expectedPathAbsAnother;23// Windows uses backslashes for path separators, which need to be escaped in24// regular expressions. This little helper function helps us generate the25// expected strings for checking path patterns.26function joinForPattern() {27  return Array.prototype.join.call(28    arguments,29    utils.escapeStrForRegex(path.sep),30  );31}32beforeEach(() => {33  root = path.resolve('/');34  expectedPathFooBar = path.join(root, 'root', 'path', 'foo', 'bar', 'baz');35  expectedPathFooQux = path.join(root, 'root', 'path', 'foo', 'qux', 'quux');36  expectedPathAbs = path.join(root, 'an', 'abs', 'path');37  expectedPathAbsAnother = path.join(root, 'another', 'abs', 'path');38});39it('picks a name based on the rootDir', () => {40  const rootDir = '/root/path/foo';41  const expected = crypto42    .createHash('md5')43    .update('/root/path/foo')44    .digest('hex');45  expect(46    normalize({47      rootDir,48    }).config.name,49  ).toBe(expected);50});51it('keeps custom names based on the rootDir', () => {52  expect(53    normalize({54      name: 'custom-name',55      rootDir: '/root/path/foo',56    }).config.name,57  ).toBe('custom-name');58});59it('sets coverageReporters correctly when argv.json is set', () => {60  expect(61    normalize(62      {63        rootDir: '/root/path/foo',64      },65      {66        json: true,67      },68    ).config.coverageReporters,69  ).toEqual(['json', 'lcov', 'clover']);70});71describe('rootDir', () => {72  it('throws if the config is missing a rootDir property', () => {73    expect(() => {74      normalize({});75    }).toThrowErrorMatchingSnapshot();76  });77});78describe('automock', () => {79  it('falsy automock is not overwritten', () => {80    const consoleWarn = console.warn;81    console.warn = jest.fn();82    const {config} = normalize({83      automock: false,84      rootDir: '/root/path/foo',85    });86    expect(config.automock).toBe(false);87    console.warn = consoleWarn;88  });89});90describe('browser', () => {91  it('falsy browser is not overwritten', () => {92    const {config} = normalize({93      browser: true,94      rootDir: '/root/path/foo',95    });96    expect(config.browser).toBe(true);97  });98});99describe('collectCoverageOnlyFrom', () => {100  it('normalizes all paths relative to rootDir', () => {101    const {config} = normalize(102      {103        collectCoverageOnlyFrom: {104          'bar/baz': true,105          'qux/quux/': true,106        },107        rootDir: '/root/path/foo/',108      },109      '/root/path',110    );111    const expected = {};112    expected[expectedPathFooBar] = true;113    expected[expectedPathFooQux] = true;114    expect(config.collectCoverageOnlyFrom).toEqual(expected);115  });116  it('does not change absolute paths', () => {117    const {config} = normalize({118      collectCoverageOnlyFrom: {119        '/an/abs/path': true,120        '/another/abs/path': true,121      },122      rootDir: '/root/path/foo',123    });124    const expected = {};125    expected[expectedPathAbs] = true;126    expected[expectedPathAbsAnother] = true;127    expect(config.collectCoverageOnlyFrom).toEqual(expected);128  });129  it('substitutes <rootDir> tokens', () => {130    const {config} = normalize({131      collectCoverageOnlyFrom: {132        '<rootDir>/bar/baz': true,133      },134      rootDir: '/root/path/foo',135    });136    const expected = {};137    expected[expectedPathFooBar] = true;138    expect(config.collectCoverageOnlyFrom).toEqual(expected);139  });140});141function testPathArray(key) {142  it('normalizes all paths relative to rootDir', () => {143    const {config} = normalize(144      {145        [key]: ['bar/baz', 'qux/quux/'],146        rootDir: '/root/path/foo',147      },148      '/root/path',149    );150    expect(config[key]).toEqual([expectedPathFooBar, expectedPathFooQux]);151  });152  it('does not change absolute paths', () => {153    const {config} = normalize({154      [key]: ['/an/abs/path', '/another/abs/path'],155      rootDir: '/root/path/foo',156    });157    expect(config[key]).toEqual([expectedPathAbs, expectedPathAbsAnother]);158  });159  it('substitutes <rootDir> tokens', () => {160    const {config} = normalize({161      [key]: ['<rootDir>/bar/baz'],162      rootDir: '/root/path/foo',163    });164    expect(config[key]).toEqual([expectedPathFooBar]);165  });166}167describe('roots', () => {168  testPathArray('roots');169});170describe('transform', () => {171  let Resolver;172  beforeEach(() => {173    Resolver = require('jest-resolve');174    Resolver.findNodeModule = jest.fn(name => name);175  });176  it('normalizes the path', () => {177    const {config} = normalize(178      {179        rootDir: '/root/',180        transform: {181          [DEFAULT_CSS_PATTERN]: '<rootDir>/node_modules/jest-regex-util',182          [DEFAULT_JS_PATTERN]: 'babel-jest',183          'abs-path': '/qux/quux',184        },185      },186      '/root/path',187    );188    expect(config.transform).toEqual([189      [DEFAULT_CSS_PATTERN, '/root/node_modules/jest-regex-util'],190      [DEFAULT_JS_PATTERN, 'babel-jest'],191      ['abs-path', '/qux/quux'],192    ]);193  });194});195describe('haste', () => {196  let Resolver;197  beforeEach(() => {198    Resolver = require('jest-resolve');199    Resolver.findNodeModule = jest.fn(name => name);200  });201  it('normalizes the path for hasteImplModulePath', () => {202    const {config} = normalize({203      haste: {204        hasteImplModulePath: '<rootDir>/hasteImpl.js',205      },206      rootDir: '/root/',207    });208    expect(config.haste).toEqual({209      hasteImplModulePath: '/root/hasteImpl.js',210    });211  });212});213describe('setupTestFrameworkScriptFile', () => {214  let Resolver;215  beforeEach(() => {216    Resolver = require('jest-resolve');217    Resolver.findNodeModule = jest.fn(218      name => name.startsWith('/') ? name : '/root/path/foo' + path.sep + name,219    );220  });221  it('normalizes the path according to rootDir', () => {222    const {config} = normalize(223      {224        rootDir: '/root/path/foo',225        setupTestFrameworkScriptFile: 'bar/baz',226      },227      '/root/path',228    );229    expect(config.setupTestFrameworkScriptFile).toEqual(expectedPathFooBar);230  });231  it('does not change absolute paths', () => {232    const {config} = normalize({233      rootDir: '/root/path/foo',234      setupTestFrameworkScriptFile: '/an/abs/path',235    });236    expect(config.setupTestFrameworkScriptFile).toEqual(expectedPathAbs);237  });238  it('substitutes <rootDir> tokens', () => {239    const {config} = normalize({240      rootDir: '/root/path/foo',241      setupTestFrameworkScriptFile: '<rootDir>/bar/baz',242    });243    expect(config.setupTestFrameworkScriptFile).toEqual(expectedPathFooBar);244  });245});246describe('coveragePathIgnorePatterns', () => {247  it('does not normalize paths relative to rootDir', () => {248    // This is a list of patterns, so we can't assume any of them are249    // directories250    const {config} = normalize(251      {252        coveragePathIgnorePatterns: ['bar/baz', 'qux/quux'],253        rootDir: '/root/path/foo',254      },255      '/root/path',256    );257    expect(config.coveragePathIgnorePatterns).toEqual([258      joinForPattern('bar', 'baz'),259      joinForPattern('qux', 'quux'),260    ]);261  });262  it('does not normalize trailing slashes', () => {263    // This is a list of patterns, so we can't assume any of them are264    // directories265    const {config} = normalize({266      coveragePathIgnorePatterns: ['bar/baz', 'qux/quux/'],267      rootDir: '/root/path/foo',268    });269    expect(config.coveragePathIgnorePatterns).toEqual([270      joinForPattern('bar', 'baz'),271      joinForPattern('qux', 'quux', ''),272    ]);273  });274  it('substitutes <rootDir> tokens', () => {275    const {config} = normalize({276      coveragePathIgnorePatterns: ['hasNoToken', '<rootDir>/hasAToken'],277      rootDir: '/root/path/foo',278    });279    expect(config.coveragePathIgnorePatterns).toEqual([280      'hasNoToken',281      joinForPattern('', 'root', 'path', 'foo', 'hasAToken'),282    ]);283  });284});285describe('testPathIgnorePatterns', () => {286  it('does not normalize paths relative to rootDir', () => {287    // This is a list of patterns, so we can't assume any of them are288    // directories289    const {config} = normalize(290      {291        rootDir: '/root/path/foo',292        testPathIgnorePatterns: ['bar/baz', 'qux/quux'],293      },294      '/root/path',295    );296    expect(config.testPathIgnorePatterns).toEqual([297      joinForPattern('bar', 'baz'),298      joinForPattern('qux', 'quux'),299    ]);300  });301  it('does not normalize trailing slashes', () => {302    // This is a list of patterns, so we can't assume any of them are303    // directories304    const {config} = normalize({305      rootDir: '/root/path/foo',306      testPathIgnorePatterns: ['bar/baz', 'qux/quux/'],307    });308    expect(config.testPathIgnorePatterns).toEqual([309      joinForPattern('bar', 'baz'),310      joinForPattern('qux', 'quux', ''),311    ]);312  });313  it('substitutes <rootDir> tokens', () => {314    const {config} = normalize({315      rootDir: '/root/path/foo',316      testPathIgnorePatterns: ['hasNoToken', '<rootDir>/hasAToken'],317    });318    expect(config.testPathIgnorePatterns).toEqual([319      'hasNoToken',320      joinForPattern('', 'root', 'path', 'foo', 'hasAToken'),321    ]);322  });323});324describe('modulePathIgnorePatterns', () => {325  it('does not normalize paths relative to rootDir', () => {326    // This is a list of patterns, so we can't assume any of them are327    // directories328    const {config} = normalize(329      {330        modulePathIgnorePatterns: ['bar/baz', 'qux/quux'],331        rootDir: '/root/path/foo',332      },333      '/root/path',334    );335    expect(config.modulePathIgnorePatterns).toEqual([336      joinForPattern('bar', 'baz'),337      joinForPattern('qux', 'quux'),338    ]);339  });340  it('does not normalize trailing slashes', () => {341    // This is a list of patterns, so we can't assume any of them are342    // directories343    const {config} = normalize({344      modulePathIgnorePatterns: ['bar/baz', 'qux/quux/'],345      rootDir: '/root/path/foo',346    });347    expect(config.modulePathIgnorePatterns).toEqual([348      joinForPattern('bar', 'baz'),349      joinForPattern('qux', 'quux', ''),350    ]);351  });352  it('substitutes <rootDir> tokens', () => {353    const {config} = normalize({354      modulePathIgnorePatterns: ['hasNoToken', '<rootDir>/hasAToken'],355      rootDir: '/root/path/foo',356    });357    expect(config.modulePathIgnorePatterns).toEqual([358      'hasNoToken',359      joinForPattern('', 'root', 'path', 'foo', 'hasAToken'),360    ]);361  });362});363describe('testRunner', () => {364  it('defaults to Jasmine 2', () => {365    const {config} = normalize({366      rootDir: '/root/path/foo',367    });368    expect(config.testRunner).toMatch('jasmine2');369  });370  it('can be changed to jasmine1', () => {371    const {config} = normalize({372      rootDir: '/root/path/foo',373      testRunner: 'jasmine1',374    });375    expect(config.testRunner).toMatch('jasmine1');376  });377  it('is overwritten by argv', () => {378    const {config} = normalize(379      {380        rootDir: '/root/path/foo',381      },382      {383        testRunner: 'jasmine1',384      },385    );386    expect(config.testRunner).toMatch('jasmine1');387  });388});389describe('testEnvironment', () => {390  let Resolver;391  beforeEach(() => {392    Resolver = require('jest-resolve');393    Resolver.findNodeModule = jest.fn(name => {394      if (name === 'jsdom') {395        return 'node_modules/jsdom';396      }397      if (name === 'jest-environment-jsdom') {398        return 'node_modules/jest-environment-jsdom';399      }400      return null;401    });402  });403  it('resolves to an environment and prefers jest-environment-`name`', () => {404    const {config} = normalize({405      rootDir: '/root',406      testEnvironment: 'jsdom',407    });408    expect(config.testEnvironment).toEqual(409      'node_modules/jest-environment-jsdom',410    );411  });412  it('throws on invalid environment names', () => {413    expect(() =>414      normalize({415        rootDir: '/root',416        testEnvironment: 'phantom',417      })).toThrowErrorMatchingSnapshot();418  });419});420describe('babel-jest', () => {421  let Resolver;422  beforeEach(() => {423    Resolver = require('jest-resolve');424    Resolver.findNodeModule = jest.fn(425      name => path.sep + 'node_modules' + path.sep + name,426    );427  });428  it('correctly identifies and uses babel-jest', () => {429    const {config} = normalize({430      rootDir: '/root',431    });432    expect(config.transform[0][0]).toBe(DEFAULT_JS_PATTERN);433    expect(config.transform[0][1]).toEqual(434      path.sep + 'node_modules' + path.sep + 'babel-jest',435    );436    expect(config.setupFiles).toEqual([437      path.sep +438        'node_modules' +439        path.sep +440        'regenerator-runtime' +441        path.sep +442        'runtime',443    ]);444  });445  it('uses babel-jest if babel-jest is explicitly specified in a custom transform config', () => {446    const customJSPattern = '^.+\\.js$';447    const {config} = normalize({448      rootDir: '/root',449      transform: {450        [customJSPattern]: 'babel-jest',451      },452    });453    expect(config.transform[0][0]).toBe(customJSPattern);454    expect(config.transform[0][1]).toEqual('/node_modules/babel-jest');455    expect(config.setupFiles).toEqual([456      path.sep +457        'node_modules' +458        path.sep +459        'regenerator-runtime' +460        path.sep +461        'runtime',462    ]);463  });464  it(`doesn't use babel-jest if its not available`, () => {465    Resolver.findNodeModule.mockImplementation(() => null);466    const {config} = normalize({467      rootDir: '/root',468    });469    expect(config.transform).toEqual(undefined);470    expect(config.setupFiles).toEqual([]);471  });472  it('uses regenerator if babel-jest is explicitly specified', () => {473    const ROOT_DIR = '<rootDir>' + path.sep;474    const {config} = normalize({475      rootDir: '/root',476      transform: {477        [DEFAULT_JS_PATTERN]: ROOT_DIR + Resolver.findNodeModule('babel-jest'),478      },479    });480    expect(config.setupFiles).toEqual([481      path.sep +482        'node_modules' +483        path.sep +484        'regenerator-runtime' +485        path.sep +486        'runtime',487    ]);488  });489});490describe('Upgrade help', () => {491  let consoleWarn;492  beforeEach(() => {493    consoleWarn = console.warn;494    console.warn = jest.fn();495  });496  afterEach(() => {497    console.warn = consoleWarn;498  });499  it('logs a warning when `scriptPreprocessor` and/or `preprocessorIgnorePatterns` are used', () => {500    const {config, hasDeprecationWarnings} = normalize({501      preprocessorIgnorePatterns: ['bar/baz', 'qux/quux'],502      rootDir: '/root/path/foo',503      scriptPreprocessor: 'bar/baz',504    });505    expect(config.transform).toEqual([['.*', '/node_modules/bar/baz']]);506    expect(config.transformIgnorePatterns).toEqual([507      joinForPattern('bar', 'baz'),508      joinForPattern('qux', 'quux'),509    ]);510    expect(config.scriptPreprocessor).toBe(undefined);511    expect(config.preprocessorIgnorePatterns).toBe(undefined);512    expect(hasDeprecationWarnings).toBeTruthy();513    expect(console.warn.mock.calls[0][0]).toMatchSnapshot();514  });515});516describe('testMatch', () => {517  it('testMatch default not applied if testRegex is set', () => {518    const {config} = normalize({519      rootDir: '/root',520      testRegex: '.*',521    });522    expect(config.testMatch.length).toBe(0);...

utils-normalizeConfig-test.js

Source:utils-normalizeConfig-test.js

...19  var expectedPathAbsAnother;20  // Windows uses backslashes for path separators, which need to be escaped in21  // regular expressions. This little helper function helps us generate the22  // expected strings for checking path patterns.23  function joinForPattern() {24    return Array.prototype.join.call(25      arguments,26      utils.escapeStrForRegex(path.sep)27    );28  }29  beforeEach(function() {30    path = require('path');31    root = path.resolve('/');32    expectedPathFooBar = path.join(root, 'root', 'path', 'foo', 'bar', 'baz');33    expectedPathFooQux = path.join(root, 'root', 'path', 'foo', 'qux', 'quux');34    expectedPathAbs = path.join(root, 'an', 'abs', 'path');35    expectedPathAbsAnother = path.join(root, 'another', 'abs', 'path');36    utils = require('../utils');37  });38  it('throws when an invalid config option is passed in', function() {39    expect(function() {40      utils.normalizeConfig({41        rootDir: '/root/path/foo',42        thisIsAnInvalidConfigKey: 'with a value even!',43      });44    }).toThrow(new Error('Unknown config option: thisIsAnInvalidConfigKey'));45  });46  describe('rootDir', function() {47    it('throws if the config is missing a rootDir property', function() {48      expect(function() {49        utils.normalizeConfig({});50      }).toThrow(new Error('No rootDir config value found!'));51    });52  });53  describe('collectCoverageOnlyFrom', function() {54    it('normalizes all paths relative to rootDir', function() {55      var config = utils.normalizeConfig({56        rootDir: '/root/path/foo/',57        collectCoverageOnlyFrom: {58          'bar/baz': true,59          'qux/quux/': true,60        },61      }, '/root/path');62      var expected = {};63      expected[expectedPathFooBar] = true;64      expected[expectedPathFooQux] = true;65      expect(config.collectCoverageOnlyFrom).toEqual(expected);66    });67    it('does not change absolute paths', function() {68      var config = utils.normalizeConfig({69        rootDir: '/root/path/foo',70        collectCoverageOnlyFrom: {71          '/an/abs/path': true,72          '/another/abs/path': true,73        },74      });75      var expected = {};76      expected[expectedPathAbs] = true;77      expected[expectedPathAbsAnother] = true;78      expect(config.collectCoverageOnlyFrom).toEqual(expected);79    });80    it('substitutes <rootDir> tokens', function() {81      var config = utils.normalizeConfig({82        rootDir: '/root/path/foo',83        collectCoverageOnlyFrom: {84          '<rootDir>/bar/baz': true,85        },86      });87      var expected = {};88      expected[expectedPathFooBar] = true;89      expect(config.collectCoverageOnlyFrom).toEqual(expected);90    });91  });92  describe('testPathDirs', function() {93    it('normalizes all paths relative to rootDir', function() {94      var config = utils.normalizeConfig({95        rootDir: '/root/path/foo',96        testPathDirs: [97          'bar/baz',98          'qux/quux/',99        ],100      }, '/root/path');101      expect(config.testPathDirs).toEqual([102        expectedPathFooBar, expectedPathFooQux,103      ]);104    });105    it('does not change absolute paths', function() {106      var config = utils.normalizeConfig({107        rootDir: '/root/path/foo',108        testPathDirs: [109          '/an/abs/path',110          '/another/abs/path',111        ],112      });113      expect(config.testPathDirs).toEqual([114        expectedPathAbs, expectedPathAbsAnother,115      ]);116    });117    it('substitutes <rootDir> tokens', function() {118      var config = utils.normalizeConfig({119        rootDir: '/root/path/foo',120        testPathDirs: [121          '<rootDir>/bar/baz',122        ],123      });124      expect(config.testPathDirs).toEqual([expectedPathFooBar]);125    });126  });127  describe('scriptPreprocessor', function() {128    it('normalizes the path according to rootDir', function() {129      var config = utils.normalizeConfig({130        rootDir: '/root/path/foo',131        scriptPreprocessor: 'bar/baz',132      }, '/root/path');133      expect(config.scriptPreprocessor).toEqual(expectedPathFooBar);134    });135    it('does not change absolute paths', function() {136      var config = utils.normalizeConfig({137        rootDir: '/root/path/foo',138        scriptPreprocessor: '/an/abs/path',139      });140      expect(config.scriptPreprocessor).toEqual(expectedPathAbs);141    });142    it('substitutes <rootDir> tokens', function() {143      var config = utils.normalizeConfig({144        rootDir: '/root/path/foo',145        scriptPreprocessor: '<rootDir>/bar/baz',146      });147      expect(config.scriptPreprocessor).toEqual(expectedPathFooBar);148    });149  });150  describe('setupEnvScriptFile', function() {151    it('normalizes the path according to rootDir', function() {152      var config = utils.normalizeConfig({153        rootDir: '/root/path/foo',154        setupEnvScriptFile: 'bar/baz',155      }, '/root/path');156      expect(config.setupEnvScriptFile).toEqual(expectedPathFooBar);157    });158    it('does not change absolute paths', function() {159      var config = utils.normalizeConfig({160        rootDir: '/root/path/foo',161        setupEnvScriptFile: '/an/abs/path',162      });163      expect(config.setupEnvScriptFile).toEqual(expectedPathAbs);164    });165    it('substitutes <rootDir> tokens', function() {166      var config = utils.normalizeConfig({167        rootDir: '/root/path/foo',168        setupEnvScriptFile: '<rootDir>/bar/baz',169      });170      expect(config.setupEnvScriptFile).toEqual(expectedPathFooBar);171    });172  });173  describe('setupTestFrameworkScriptFile', function() {174    it('normalizes the path according to rootDir', function() {175      var config = utils.normalizeConfig({176        rootDir: '/root/path/foo',177        setupTestFrameworkScriptFile: 'bar/baz',178      }, '/root/path');179      expect(config.setupTestFrameworkScriptFile).toEqual(expectedPathFooBar);180    });181    it('does not change absolute paths', function() {182      var config = utils.normalizeConfig({183        rootDir: '/root/path/foo',184        setupTestFrameworkScriptFile: '/an/abs/path',185      });186      expect(config.setupTestFrameworkScriptFile).toEqual(expectedPathAbs);187    });188    it('substitutes <rootDir> tokens', function() {189      var config = utils.normalizeConfig({190        rootDir: '/root/path/foo',191        setupTestFrameworkScriptFile: '<rootDir>/bar/baz',192      });193      expect(config.setupTestFrameworkScriptFile).toEqual(expectedPathFooBar);194    });195  });196  describe('testPathIgnorePatterns', function() {197    it('does not normalize paths relative to rootDir', function() {198      // This is a list of patterns, so we can't assume any of them are199      // directories200      var config = utils.normalizeConfig({201        rootDir: '/root/path/foo',202        testPathIgnorePatterns: [203          'bar/baz',204          'qux/quux',205        ],206      }, '/root/path');207      expect(config.testPathIgnorePatterns).toEqual([208        joinForPattern('bar', 'baz'),209        joinForPattern('qux', 'quux'),210      ]);211    });212    it('does not normalize trailing slashes', function() {213      // This is a list of patterns, so we can't assume any of them are214      // directories215      var config = utils.normalizeConfig({216        rootDir: '/root/path/foo',217        testPathIgnorePatterns: [218          'bar/baz',219          'qux/quux/',220        ],221      });222      expect(config.testPathIgnorePatterns).toEqual([223        joinForPattern('bar', 'baz'),224        joinForPattern('qux', 'quux', ''),225      ]);226    });227    it('substitutes <rootDir> tokens', function() {228      var config = utils.normalizeConfig({229        rootDir: '/root/path/foo',230        testPathIgnorePatterns: [231          'hasNoToken',232          '<rootDir>/hasAToken',233        ],234      });235      expect(config.testPathIgnorePatterns).toEqual([236        'hasNoToken',237        joinForPattern('', 'root', 'path', 'foo', 'hasAToken'),238      ]);239    });240  });241  describe('modulePathIgnorePatterns', function() {242    it('does not normalize paths relative to rootDir', function() {243      // This is a list of patterns, so we can't assume any of them are244      // directories245      var config = utils.normalizeConfig({246        rootDir: '/root/path/foo',247        modulePathIgnorePatterns: [248          'bar/baz',249          'qux/quux',250        ],251      }, '/root/path');252      expect(config.modulePathIgnorePatterns).toEqual([253        joinForPattern('bar', 'baz'),254        joinForPattern('qux', 'quux'),255      ]);256    });257    it('does not normalize trailing slashes', function() {258      // This is a list of patterns, so we can't assume any of them are259      // directories260      var config = utils.normalizeConfig({261        rootDir: '/root/path/foo',262        modulePathIgnorePatterns: [263          'bar/baz',264          'qux/quux/',265        ],266      });267      expect(config.modulePathIgnorePatterns).toEqual([268        joinForPattern('bar', 'baz'),269        joinForPattern('qux', 'quux', ''),270      ]);271    });272    it('substitutes <rootDir> tokens', function() {273      var config = utils.normalizeConfig({274        rootDir: '/root/path/foo',275        modulePathIgnorePatterns: [276          'hasNoToken',277          '<rootDir>/hasAToken',278        ],279      });280      expect(config.modulePathIgnorePatterns).toEqual([281        'hasNoToken',282        joinForPattern('', 'root', 'path', 'foo', 'hasAToken'),283      ]);284    });285  });...

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.