Join the 1-day Testing & QA Summit featuring 15+ Expert Speakers.Register for FREE! Join TestMu Conference

How to use uncovered method in Jest

Best JavaScript code snippet using jest

buildBody.test.js

Source:buildBody.test.js

1const proxyquire = require("proxyquire");2const sinon = require("sinon");3const { assert } = require("chai");4const defaultMocks = {5  buildCommentDetails: () => null,6  uncoveredFileLinesByFileNames: () => [],7  mergeFileLinesWithChangedFiles: () => [],8  buildGithubCommentTitle: () => "Barecheck - Code coverage report"9};10const buildBodyMock = (mocks) => {11  const {12    buildCommentDetails,13    uncoveredFileLinesByFileNames,14    mergeFileLinesWithChangedFiles,15    buildGithubCommentTitle16  } = {17    ...defaultMocks,18    ...mocks19  };20  return proxyquire("../../../src/github/comment/buildBody", {21    "./buildDetails": buildCommentDetails,22    "../../lcov": { uncoveredFileLinesByFileNames },23    "../../coverage": { mergeFileLinesWithChangedFiles },24    "../utils": { buildGithubCommentTitle }25  });26};27describe("github/comment/buildDetails", () => {28  it("buildCommentDetails should be called with proper args once changedFiles arr is empty", async () => {29    const changedFiles = [];30    const coverageDiff = 1;31    const totalCoverage = 3;32    const compareFileData = [];33    const uncoveredFileLines = [{ test: 1 }];34    const fileLinesWithChangedFiles = [{ some: 4 }];35    const uncoveredFileLinesByFileNames = sinon36      .stub()37      .returns(uncoveredFileLines);38    const mergeFileLinesWithChangedFiles = sinon39      .stub()40      .returns(fileLinesWithChangedFiles);41    const buildCommentDetails = sinon.stub().returns("");42    const buildBody = buildBodyMock({43      buildCommentDetails,44      uncoveredFileLinesByFileNames,45      mergeFileLinesWithChangedFiles46    });47    await buildBody(changedFiles, coverageDiff, totalCoverage, compareFileData);48    assert.isTrue(buildCommentDetails.calledOnce);49    assert.deepEqual(buildCommentDetails.firstCall.args, [50      fileLinesWithChangedFiles51    ]);52  });53  it("buildCommentDetails should be called with proper args when we have changed files", async () => {54    const changedFiles = [55      {56        filename: "test.txt"57      }58    ];59    const coverageDiff = 1;60    const totalCoverage = 3;61    const compareFileData = [];62    const uncoveredFileLines = [{ test: 1 }];63    const fileLinesWithChangedFiles = [{ some: 4 }];64    const uncoveredFileLinesByFileNames = sinon65      .stub()66      .returns(uncoveredFileLines);67    const mergeFileLinesWithChangedFiles = sinon68      .stub()69      .returns(fileLinesWithChangedFiles);70    const buildCommentDetails = sinon.stub().returns("");71    const buildBody = buildBodyMock({72      buildCommentDetails,73      uncoveredFileLinesByFileNames,74      mergeFileLinesWithChangedFiles75    });76    await buildBody(changedFiles, coverageDiff, totalCoverage, compareFileData);77    assert.isTrue(uncoveredFileLinesByFileNames.calledOnce);78    assert.deepEqual(uncoveredFileLinesByFileNames.firstCall.args, [79      ["test.txt"],80      compareFileData81    ]);82    assert.isTrue(buildCommentDetails.calledOnce);83    assert.deepEqual(buildCommentDetails.firstCall.args, [84      fileLinesWithChangedFiles85    ]);86  });87  it("should return body text", async () => {88    const changedFiles = [];89    const coverageDiff = 1;90    const totalCoverage = 3;91    const compareFileData = [];92    const uncoveredFileLines = [];93    const fileLinesWithChangedFiles = [];94    const commentDetailsMessage = "detailed message";95    const uncoveredFileLinesByFileNames = sinon96      .stub()97      .returns(uncoveredFileLines);98    const mergeFileLinesWithChangedFiles = sinon99      .stub()100      .returns(fileLinesWithChangedFiles);101    const buildCommentDetails = sinon.stub().returns(commentDetailsMessage);102    const buildBody = buildBodyMock({103      buildCommentDetails,104      uncoveredFileLinesByFileNames,105      mergeFileLinesWithChangedFiles106    });107    const body = await buildBody(108      changedFiles,109      coverageDiff,110      totalCoverage,111      compareFileData112    );113    assert.deepEqual(114      body,115      "<h3>Barecheck - Code coverage report</h3>Total: <b>3%</b>\n\nYour code coverage diff: <b>1% â´</b>\n\ndetailed message"116    );117  });118  [119    [-10, "â¾"],120    [10, "â´"],121    [0, false]122  ].forEach(([coverageDiff, arrow]) => {123    it(`should return body text with ${arrow}`, async () => {124      const changedFiles = [];125      const totalCoverage = 3;126      const compareFileData = [];127      const uncoveredFileLines = [];128      const fileLinesWithChangedFiles = [];129      const commentDetailsMessage = "detailed message";130      const uncoveredFileLinesByFileNames = sinon131        .stub()132        .returns(uncoveredFileLines);133      const mergeFileLinesWithChangedFiles = sinon134        .stub()135        .returns(fileLinesWithChangedFiles);136      const buildCommentDetails = sinon.stub().returns(commentDetailsMessage);137      const buildBody = buildBodyMock({138        buildCommentDetails,139        uncoveredFileLinesByFileNames,140        mergeFileLinesWithChangedFiles141      });142      const body = await buildBody(143        changedFiles,144        coverageDiff,145        totalCoverage,146        compareFileData147      );148      if (arrow) {149        assert.isTrue(body.includes(arrow));150      } else {151        assert.isFalse(body.includes("â¾"));152        assert.isFalse(body.includes("â´"));153      }154    });155  });...

Elimination.js

Source:Elimination.js

1/* now we have Array PrimeImplicants = [ object implicant , object implicant , .. ]2 * PrimeImplicants[0] --> object implicant = {baseValue: 1, bitsCovered: [2,4], isChecked: false, 3 *                                            isDontCare: false, degree: 1, mintermsCoverd: [1,3,5,7]}4 * in the end of this file we must have an Array of RemaningPI like this :5 * Array RemaningPI = [ object implicant , object implicant , .. ]6 * RemaningPI[0] = {baseValue: 1, bitsCovered: [2,4], isChecked: false, isDontCare: false, degree: 0, mintermsCoverd: [1,3]}7 */89var remainingImplicants;10var uncoveredMinTerms;1112function eliminationProcess() {13	//duplicate primeImplicants array into remainingImplicants14	remainingImplicants = primeImplicants.slice();15	uncoveredMinTerms = minTerms.slice();16	while (uncoveredMinTerms.length>0 && (checkEssentialImplicants() || checkRowDominance() || checkColumnDominance()));17}1819function checkEssentialImplicants() {20	//sparse array to store how many implicants21	//each minterm is covered by22	//the value for minterms not included will be undefined23	var termsCoverCount = [];2425	var essentialImplicantFound = false;2627	//iterate on all implicant and increment the count28	//for each min term they cover29	for (var i=0; i<remainingImplicants.length; i++) {30		var primeImplicant = remainingImplicants[i];3132		for (var j=0; j<primeImplicant.mintermsCovered.length; j++) {33			var term = primeImplicant.mintermsCovered[j]3435			//if first time to cover a term, initialize its place with 136			if (termsCoverCount[term] == undefined) {37				termsCoverCount[term] = 1;38			} else {39				termsCoverCount[term]++;40			}41		}42	}4344	for (var i=0; i<uncoveredMinTerms.length; i++) {4546		//if a term is only covered by one implicant,47		//find the implicant and add it to resultImplicants48		if (termsCoverCount[uncoveredMinTerms[i]] == 1) {49			for (var j=0; j<remainingImplicants.length; j++) {5051				var primeImplicantMinterms = remainingImplicants[j].mintermsCovered;5253				if (primeImplicantMinterms.includes(uncoveredMinTerms[i])) {5455					//remove all minterms this implicant covers56					for (var k=0; k<primeImplicantMinterms.length; k++) {57						if (uncoveredMinTerms.includes(primeImplicantMinterms[k])) {58							var termIndex = uncoveredMinTerms.indexOf(primeImplicantMinterms[k]);59							uncoveredMinTerms.splice(termIndex,1)60						}61					}6263					//add implicant to resultImplicants and remove it from remainingImplicants64					resultImplicants.push(remainingImplicants[j]);65					remainingImplicants.splice(j,1);66					essentialImplicantFound = true;67					break;68				}6970			}71		}72	}7374	return essentialImplicantFound;75}7677//compares every two rows to check for row dominance78function checkRowDominance() {79	//var rowDominanceFound = false;8081	for (var i=0; i<remainingImplicants.length; i++) {82		for (var j=0; j<remainingImplicants.length; j++) {83			if (i==j) continue;8485			//if dominance found, remove the dominated row86			if (rowDominates(remainingImplicants[i], remainingImplicants[j])) {87				remainingImplicants.splice(j,1);88				return true;89				//rowDominanceFound = true;90			}9192		}93	}94	return false;95	//return rowDominanceFound;96}9798//checks if the first implicant row-dominates the second implicant99function rowDominates(imp1, imp2) {100	//counters to check if both implicants cover the same minterms101	var termsCount1 = 0;102	var termsCount2 = 0;103104	for (var i=0; i<imp2.mintermsCovered.length; i++) {105106		var termInImp2 = imp2.mintermsCovered[i];107108		if (uncoveredMinTerms.includes(termInImp2)) {109			if (!imp1.mintermsCovered.includes(termInImp2)) {110				return false;111			} else {112				termsCount2++;113			}114		}115	}116117	for (var i=0; i<imp1.mintermsCovered.length; i++) {118		var termInImp1 = imp1.mintermsCovered[i];119		if (uncoveredMinTerms.includes(termInImp1)) {120			termsCount1++;121		}122	}123124	if (termsCount1 == termsCount2) {125		return false;126	}127	return true;128}129130//compares every two columns to check for column dominance131function checkColumnDominance() {132	//var columnDominanceFound = false;133134	for (var i=0; i<uncoveredMinTerms.length; i++) {135		for (var j=0; j<uncoveredMinTerms.length; j++) {136			if (i==j) continue;137138			//if dominance found, remove the dominated column139			if (columnDominates(uncoveredMinTerms[i], uncoveredMinTerms[j])) {140				uncoveredMinTerms.splice(j,1);141				return true;142				//columnDominanceFound = true;143			}144		}145	}146	return false;147	//return columnDominanceFound;148}149150//checks if the first minterm column-dominates the second minterm151function columnDominates(term1, term2) {152	for (var i=0; i<remainingImplicants.length; i++) {153		var currentImplicantTerms = remainingImplicants[i].mintermsCovered;154155		if (currentImplicantTerms.includes(term1) && !currentImplicantTerms.includes(term2)) {156			return false;157		}158	}159	return true;
...

corpuscoverage.js

Source:corpuscoverage.js

1var path = require('path'),2    util = require('util'),3    fs = require('fs');4var salient = require('./../');5var args = process.argv;6if (!args || args.length < 5) {7    console.log('usage: node corpuscoverage en.wik.dist en.wik.vocab en-brown.tag.vocab');8    return;9}10var wikDistFile = args[2];11var wikVocabFile = args[3];12var corpusVocabFile = args[4];13function readDist(file) {14    var dist = {};15    var lines = fs.readFileSync(file).toString().split('\n');16    for (var l = 0; l < lines.length; l++) {17        var line = lines[l];18        if (line.indexOf('#') == 0) {19            continue;20        }21        var items = line.split('\t');22        if (items.length != 4) {23            continue;24        }25        var i = parseInt(items[0]);26        var tag = items[1];27        var freq = items[2];28        dist[tag] = { i: i, t: tag, f: freq };29    }30    return dist;31};32function readDict(file, corpus) {33    var vocab = {};34    var lines = fs.readFileSync(file).toString().split('\n');35    for (var l = 0; l < lines.length; l++) {36        var line = lines[l];37        var items = line.split('\t');38        if (!items || items.length < 2)39            continue;40        if (corpus) {41            // TOKEN FREQUENCY POS/FREQ,POS/FREQ OR TOKEN FREQUENCY42            var w = items[0].toLowerCase();43            vocab[w] = { freq: parseInt(items[1]), id: l.toString(), w: w }44            if (items.length > 2) {45                vocab[w].pos = items[2];46            }47        }48        else if (items.length > 2) {49            // ID TOKEN POS,POS50            var w = items[1].toLowerCase();51            vocab[w] = { pos: items[2], id: items[0], w: w };52        }53    }54    vocab._length = lines.length;55    return vocab;56}57function mapCorpus(vocab, dist) {58    for (var v in vocab) {59        var pos = vocab[v].pos;60        if (pos) {61            var result = [];62            var resultFreq = [];63            var items = pos.split(',');64            for (var i = 0; i < items.length; i++) {65                var item = items[i].split('/');66                var tag = item[0];67                var tagFreq = item[1];68                if (typeof dist[tag] != 'undefined') {69                    var tagId = dist[tag].i;70                    if (result.indexOf(tagId) < 0) {71                        result.push(tagId);72                        resultFreq.push(tagFreq);73                    }74                }75            }76            vocab[v].pos = result.join(',');77            vocab[v].posFreq = resultFreq.join(',');78        }79    }80}81var dict = readDict(wikVocabFile, false);82var corpusV = readDict(corpusVocabFile, true);83var distribution = readDist(wikDistFile);84mapCorpus(corpusV, distribution);85// Determine whether the corpus is a subset, supset, overlap or disjoint set of the vocabulary86var corpusCovered = 0;87var corpusUncovered = 0;88var uncoveredOutput = path.join(__dirname, 'uncovered.corpus.vocab');89var coveredOutput = path.join(__dirname, 'covered.corpus.vocab');90var uncoveredSorted = [];91var coveredSorted = [];92for (var c in corpusV) {93    if (typeof dict[c] != 'undefined') {94        coveredSorted.push(corpusV[c]);95        corpusCovered++;96    }97    else {98        var item = corpusV[c];99        // determine if the item falls under a numeric or money category ala regex100        if (c.match(/\$?\d+/)) {101            continue;102        }103        uncoveredSorted.push(item);104        corpusUncovered++;105    }106}107uncoveredSorted = uncoveredSorted.sort(function (a, b) { return b.freq - a.freq });108for (var i = 0; i < corpusUncovered; i++) {109    var item = uncoveredSorted[i];110    var additionLine = util.format('%s\t%s\t%s\t%s\n', dict._length + i, item.w, item.pos, item.posFreq);111    fs.appendFileSync(uncoveredOutput, additionLine);112}113coveredSorted = coveredSorted.sort(function (a, b) { return b.freq - a.freq });114for (var i = 0; i < corpusCovered; i++) {115    var item = coveredSorted[i];116    var additionLine = util.format('%s\t%s\t%s\t%s\n', dict._length + i, item.w, item.pos, item.posFreq);117    fs.appendFileSync(coveredOutput, additionLine);118}119// Determine whether the vocabulary is a subset, supset, overlap or disjoint set of the corpus120var countCovered = 0;121var countUncovered = 0;122for (var c in dict) {123    if (typeof corpusV[c] != 'undefined') {124        countCovered++;125    }126    else {127        countUncovered++;128    }129}130console.log(util.format('%s found in vocab, %s not found in vocab. %s% covered', corpusCovered,131            corpusUncovered, Math.round(100 * corpusCovered / (corpusCovered + corpusUncovered))));132console.log(util.format('%s found in corpus, %s not found in corpus. %s% covered', countCovered,...

county-data-checker.js

Source:county-data-checker.js

1const _ = require('underscore');2function printStatusReportOnNewUpdate(countyToPostalCodes, reportResults, censusData, electionData) {3  var postalCodeCounts = 0;4  var countyStateCounts = 0;5  _.each(countyToPostalCodes, (val, key) => {6    postalCodeCounts += val.length;7    countyStateCounts++;8  });9  console.log(`Found ${postalCodeCounts} postal codes.`);10  console.log(`Found ${countyStateCounts} county state name mappings.`);11  const dateLogs = {};12  const reportSet = new Set();13  var countyStateReportCounts = 0;14  var coveredPostalCodeCounts = 0;15  var uncoveredCensusCounts = 0;16  const uncoveredCensusSet = new Set();17  var uncoveredElectionCounts = 0;18  const uncoveredElectionSet = new Set();19  const ignoredElectionSet = new Set(['69', '72', '78']);20  _.each(reportResults, result => {21    const currentDate = result.currentDate;22    if (Object.prototype.hasOwnProperty.call(dateLogs, currentDate)) {23      dateLogs[currentDate]++;24    } else {25      dateLogs[currentDate] = 1;26    }27    countyStateReportCounts++;28    if (Object.prototype.hasOwnProperty.call(countyToPostalCodes, result.fips)) {29      coveredPostalCodeCounts += countyToPostalCodes[result.fips].length;30    }31    reportSet.add(result.fips);32    if (!Object.prototype.hasOwnProperty.call(censusData.county, result.fips)) {33      uncoveredCensusSet.add(result.fips);34      uncoveredCensusCounts++;35    }36    if (!Object.prototype.hasOwnProperty.call(electionData.county, result.fips)) {37      const s = result.fips.substring(0, 2);38      if (!ignoredElectionSet.has(s)) {39        uncoveredElectionSet.add(result.fips);40        uncoveredElectionCounts++;41      }42    }43  });44  var unreachableCountyStateCounts = 0;45  const unreachableCountyStateSet = new Set();46  _.each(countyToPostalCodes, (val, key) => {47    if (reportSet.has(key)) {48      reportSet.delete(key);49    } else {50      unreachableCountyStateCounts += 1;51      unreachableCountyStateSet.add(key);52    }53  });54  console.log(`Of the ${countyStateReportCounts} county reports, date distribution are as follows.`);55  console.log(dateLogs);56  console.log(`This covers ${coveredPostalCodeCounts} out of ${postalCodeCounts} postal codes.`);57  console.log(`${reportSet.size} out of ${countyStateReportCounts} county reports cannot be reached.`);58  console.log(reportSet);59  console.log(`${unreachableCountyStateCounts} out of ${countyStateCounts} county states have no data associated.`);60  console.log(unreachableCountyStateSet);61  console.log(`${uncoveredCensusCounts} out of ${countyStateReportCounts} county reports have no percentage.`);62  console.log(uncoveredCensusSet);63  console.log(`${uncoveredElectionCounts} out of ${countyStateReportCounts} county reports have no election results.`);64  console.log(uncoveredElectionSet);65  if (uncoveredCensusCounts > 0) {66    throw Error('Some counties do not have population count');67  }68}69function deduplicateArray(results, fun) {70  const set = new Set();71  const newResults = [];72  _.each(results, v => {73    const p = fun(v);74    if (!set.has(p)) {75      newResults.push(v);76      set.add(p);77    }78  });79  return newResults;80}81module.exports = {82  deduplicateArray: deduplicateArray,83  printStatusReportOnNewUpdate: printStatusReportOnNewUpdate...

flow-highlight-source.js

Source:flow-highlight-source.js

1$(function() {2  // Convert the text area into a CodeMirror area in readOnly mode.3  var cm = CodeMirror.fromTextArea(document.querySelector("textarea"), {4    readOnly: true,5    lineNumbers: true,6    mode: "text/typescript",7    scrollbarStyle: "simple",8    gutters: [9      "Flow-lineuncovered",10      "CodeMirror-linenumbers"11    ]12  });13  // TODO: handle corrupted coverage data?14  var coverageData = JSON.parse(document.querySelector("#file-coverage-data").textContent);15  var uncoveredLocs = coverageData.expressions.uncovered_locs;16  // Create uncovered range markers.17  for (var loc of uncoveredLocs) {18    cm.markText(19      {line: loc.start.line - 1, ch: loc.start.column - 1},20      {line: loc.end.line - 1, ch: loc.end.column},21      {22        className: "cm-flow-uncovered",23      }24    );25  }26  // Create uncovered ranges scrollbar annotations.27  var scrollbarAnnotations = cm.annotateScrollbar({28    className: "cm-flow-uncovered",29    listenForUpdates: false,30  });31  scrollbarAnnotations.update(uncoveredLocs.map(function (loc) {32    return {33      from: {line: loc.start.line - 1, ch: loc.start.column -1},34      to: {line: loc.end.line - 1, ch: loc.start.column},35    };36  }));37  // Create the line gutters.38  for (var i = 0; i < cm.lineCount(); i++) {39    var count = uncoveredLocs.reduce(function (acc, loc) {40      if (i >= loc.start.line - 1 && i <= loc.end.line - 1) {41        acc += 1;42      }43      return acc;44    }, 0);45    if (count > 0) {46      var el = document.createElement("div");47      el.textContent =  count + "x";48      el.style.textAlign = "center";49      el.style.fontSize = "0.6em";50      var color = "rgba(255,0,0," + count * 0.2 + ")";51      el.style.background = color;52      cm.setGutterMarker(i, "Flow-lineuncovered", el);53    }54  }55  // Refresh the uncovered range markers background alpha56  // (number of time the marker span appears in an uncovered range * alpha step).57  CodeMirror.on(cm, "viewportChange", function(cm, marker){58    for (var el of document.querySelectorAll(".cm-flow-uncovered")) {59      var count = Array.from(el.classList).filter(function (cls) {60        if (cls !== "cm-flow-uncovered") {61          return false;62        }63        return true;64      }).length;65      var color = "rgba(255,0,0," + count * 0.2 + ")";66      el.style.background = color;67    }68  });69  // Configure the dropdowns70  $('.ui.dropdown.uncovered-locations')71    .dropdown({72      action: 'hide',73      onChange: function (value) {74        if (value == "") {75          return;76        }77        $('.ui.dropdown.uncovered-locations').dropdown('set value', "");78        cm.scrollIntoView({line: parseInt(value)}, 150);79      }80    });81  $('.ui.dropdown.syntax-highlighting')82    .dropdown({83      onChange: function (value) {84        var mode = "typescript";85        switch (value) {86        case "es":87          mode = "text/typescript";88          break;89        case "js":90          mode = "javascript";91          break;92        default:93          mode = "";94        }95        console.log("SET MODE", mode);96        cm.setOption("mode", mode);97      }98    });...

complementary.js

Source:complementary.js

1/*2 * SonarQube3 * Copyright (C) 2009-2018 SonarSource SA4 * mailto:info AT sonarsource DOT com5 *6 * This program is free software; you can redistribute it and/or7 * modify it under the terms of the GNU Lesser General Public8 * License as published by the Free Software Foundation; either9 * version 3 of the License, or (at your option) any later version.10 *11 * This program is distributed in the hope that it will be useful,12 * but WITHOUT ANY WARRANTY; without even the implied warranty of13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU14 * Lesser General Public License for more details.15 *16 * You should have received a copy of the GNU Lesser General Public License17 * along with this program; if not, write to the Free Software Foundation,18 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.19 */20// @flow21export const complementary = {22  coverage: ['uncovered_lines', 'uncovered_conditions'],23  line_coverage: ['uncovered_lines'],24  branch_coverage: ['uncovered_conditions'],25  uncovered_lines: ['line_coverage'],26  uncovered_conditions: ['branch_coverage'],27  new_coverage: ['new_uncovered_lines', 'new_uncovered_conditions'],28  new_line_coverage: ['new_uncovered_lines'],29  new_branch_coverage: ['new_uncovered_conditions'],30  new_uncovered_lines: ['new_line_coverage'],31  new_uncovered_conditions: ['new_branch_coverage'],32  duplicated_lines_density: ['duplicated_lines'],33  new_duplicated_lines_density: ['new_duplicated_lines'],34  duplicated_lines: ['duplicated_lines_density'],35  new_duplicated_lines: ['new_duplicated_lines_density']...

CoveredOrUncovered.js

Source:CoveredOrUncovered.js

1var invert = require('invert-obj');2function CoveredOrUncovered (coveredOrUncovered) {3  this.message = coveredOrUncovered;4}5CoveredOrUncovered.prototype.value = function () {6  return this.message;7};8CoveredOrUncovered.Keys = {9  'COVERED': '0',10  'UNCOVERED': '1',11};12CoveredOrUncovered.Tag = '203';13CoveredOrUncovered.Type = 'INT';14CoveredOrUncovered.Values = invert(CoveredOrUncovered.Keys);...

LegCoveredOrUncovered.js

Source:LegCoveredOrUncovered.js

1var invert = require('invert-obj');2function LegCoveredOrUncovered (legCoveredOrUncovered) {3  this.message = legCoveredOrUncovered;4}5LegCoveredOrUncovered.prototype.value = function () {6  return this.message;7};8LegCoveredOrUncovered.Tag = '565';9LegCoveredOrUncovered.Type = 'INT';...

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.