Best JavaScript code snippet using cypress
test-scheduler.js
Source: test-scheduler.js
1var assert = require ('assert');2var sinon = require ('sinon');3var Scheduler = require('../lib/scheduler');4describe ('scheduler', function(){5 var scheduler;6 var stub;7 var clock;8 var mockJobWorker;9 beforeEach(function(done){10 clock = sinon.useFakeTimers();11 mockJobWorker = {12 widget_item: { job: 'dummy' },13 config:{interval: 3000},14 onRun : function(){},15 pushUpdate: function(){},16 dependencies : {17 logger : {18 warn: function (){},19 error: function (){},20 log: function (){}21 }22 }23 };24 stub = sinon.stub(mockJobWorker, "onRun", function(config, dependencies, cb) {25 cb(null, {});26 });27 done();28 });29 afterEach(function(done){30 stub.restore();31 clock.restore();32 done();33 });34 it('should execute the job when "start" is executed', function(done){35 scheduler = new Scheduler(mockJobWorker);36 mockJobWorker.onRun = function (){37 done();38 };39 scheduler.start();40 });41 it('should schedule a job to be executed in the future in intervals of time', function(){42 scheduler = new Scheduler(mockJobWorker);43 scheduler.start();44 clock.tick(3000);45 clock.tick(3000);46 assert.ok(stub.calledThrice);47 });48 it('should set 1 sec as the minimum interval period', function(){49 mockJobWorker.config.interval = 10; // really low interval (ms)50 scheduler = new Scheduler(mockJobWorker);51 scheduler.start();52 clock.tick(1000);53 clock.tick(1000);54 assert.ok(stub.calledThrice);55 });56 it('should set 60 sec if interval is not provided', function(){57 mockJobWorker.config.interval = null;58 scheduler = new Scheduler(mockJobWorker);59 scheduler.start();60 clock.tick(60000);61 clock.tick(60000);62 assert.ok(stub.calledThrice);63 });64 it('should allow job workers to maintain state across calls', function(){65 mockJobWorker.onRun = function (config, dependencies, cb){66 this.counter = (this.counter || 0) + 1;67 cb(null, {});68 };69 scheduler = new Scheduler(mockJobWorker);70 scheduler.start();71 clock.tick(3000);72 clock.tick(3000);73 assert.equal(mockJobWorker.counter, 3);74 });75 it('should schedule when received an empty data parameter', function(done){76 mockJobWorker.onRun = function (config, dependencies, cb){77 cb(null);78 };79 mockJobWorker.pushUpdate = function(){80 done();81 };82 scheduler = new Scheduler(mockJobWorker);83 scheduler.start();84 });85 it('should handle and log asynchronous errors', function(done){86 mockJobWorker.onRun = function (config, dependencies, cb){87 cb('error');88 };89 mockJobWorker.dependencies.logger.error = function(error){90 assert.ok(error);91 done();92 };93 scheduler = new Scheduler(mockJobWorker);94 scheduler.start();95 });96 it('should notify client on asynchronous errors', function(done){97 mockJobWorker.onRun = function (config, dependencies, cb){98 cb('error');99 };100 mockJobWorker.pushUpdate = function(data){101 assert.ok(data.error);102 done();103 };104 scheduler = new Scheduler(mockJobWorker);105 scheduler.start();106 });107 it('should allow a grace period to raise errors if retryOnErrorTimes is defined', function(){108 mockJobWorker.config.retryOnErrorTimes = 3;109 var numberJobExecutions = 0;110 var numberCallsSendDataWithErrors = 0;111 var numberCallsSendDataWithSuccess = 0;112 mockJobWorker.pushUpdate = function (data) {113 if (data.error) {114 numberCallsSendDataWithErrors++;115 } else {116 numberCallsSendDataWithSuccess++;117 }118 };119 mockJobWorker.onRun = function (config, dependencies, cb){120 if (numberJobExecutions === 0) {121 cb();122 }123 else {124 cb('err');125 }126 numberJobExecutions++;127 };128 scheduler = new Scheduler(mockJobWorker);129 scheduler.start();130 clock.tick(3000);131 clock.tick(3000/3);132 clock.tick(3000/3);133 assert.equal(numberJobExecutions, 4);134 assert.equal(numberCallsSendDataWithErrors, 1);135 });136 it('should handle synchronous errors in job execution', function(){137 mockJobWorker.onRun = sinon.stub().throws('err');138 scheduler = new Scheduler(mockJobWorker);139 scheduler.start();140 assert.ok(mockJobWorker.onRun.calledOnce);141 });142 it('should notify client when synchronous error occurred during job execution', function(done){143 mockJobWorker.onRun = sinon.stub().throws('err');144 mockJobWorker.pushUpdate = function(data){145 assert.ok(data.error);146 done();147 };148 scheduler = new Scheduler(mockJobWorker);149 scheduler.start();150 assert.ok(mockJobWorker.onRun.calledOnce);151 });152 it('should notify client on first synchronous error during job execution even when retryAttempts are configured', function(done){153 mockJobWorker.onRun = sinon.stub().throws('err');154 mockJobWorker.config.retryOnErrorTimes = 3;155 mockJobWorker.pushUpdate = function(data){156 assert.ok(data.error);157 done();158 };159 scheduler = new Scheduler(mockJobWorker);160 scheduler.start();161 assert.ok(mockJobWorker.onRun.calledOnce);162 });163 it('should schedule onRun even if there was a synchronous error', function () {164 mockJobWorker.onRun = sinon.stub().throws('err');165 scheduler = new Scheduler(mockJobWorker);166 scheduler.start();167 clock.tick(3000);168 // we expect the initial call plus one call every second (one third of the original interval in recovery mode)169 assert.equal(mockJobWorker.onRun.callCount, 4);170 });171 it('should not schedule more than one job when job execution takes long time', function() {172 mockJobWorker.onRun = function() {};173 var stub = sinon.stub(mockJobWorker, "onRun", function (config, dependencies, cb) {174 setTimeout(function() {175 cb(null, {});176 }, 10000);177 });178 scheduler = new Scheduler(mockJobWorker, {});179 scheduler.start();180 clock.tick(13000);181 clock.tick(13000);182 assert.ok(stub.calledThrice);183 });184 it('should warn if multiple job callbacks are executed', function(done) {185 mockJobWorker.onRun = function(config, dependencies, job_callback){186 job_callback(null, {});187 job_callback(null, {});188 };189 mockJobWorker.dependencies.logger.warn = function (msg) {190 assert.ok(msg.indexOf('job_callback executed more than once') > -1);191 done();192 };193 scheduler = new Scheduler(mockJobWorker);194 scheduler.start();195 });...
AsyncTask.js
Source: AsyncTask.js
1define([2 "underscore",3 "constants",4 "utils",5 "eventMgr",6], function(_, constants, utils, eventMgr) {7 8 var taskQueue = [];9 10 function AsyncTask(force) {11 this.finished = false;12 this.timeout = constants.ASYNC_TASK_DEFAULT_TIMEOUT;13 this.retryCounter = 0;14 this.runCallbacks = [];15 this.successCallbacks = [];16 this.errorCallbacks = [];17 this.force = force;18 }19 20 /**21 * onRun callbacks are called by chain(). These callbacks have to call22 * chain() themselves to chain with next onRun callback or error() to23 * throw an exception or retry() to restart the task.24 */25 AsyncTask.prototype.onRun = function(callback) {26 this.runCallbacks.push(callback);27 };28 29 /**30 * onSuccess callbacks are called when every onRun callbacks have31 * succeed.32 */33 AsyncTask.prototype.onSuccess = function(callback) {34 this.successCallbacks.push(callback);35 };36 37 /**38 * onError callbacks are called when error() is called in a onRun39 * callback.40 */41 AsyncTask.prototype.onError = function(callback) {42 this.errorCallbacks.push(callback);43 };44 45 /**46 * chain() calls the next onRun callback or the onSuccess callbacks when47 * finished. The optional callback parameter can be used to pass an48 * onRun callback during execution, bypassing the onRun queue.49 */50 var currentTaskStartTime = 0;51 AsyncTask.prototype.chain = function(callback) {52 currentTaskStartTime = utils.currentTime;53 utils.logStackTrace();54 if(this.finished === true) {55 return;56 }57 // If first execution58 if(this.queue === undefined) {59 // Create a copy of the onRun callbacks60 this.queue = this.runCallbacks.slice();61 }62 // If a callback is passed as a parameter63 if(callback !== undefined) {64 callback();65 return;66 }67 // If all callbacks have been run68 if(this.queue.length === 0) {69 // Run the onSuccess callbacks70 runSafe(this, this.successCallbacks);71 return;72 }73 // Run the next callback74 var runCallback = this.queue.shift();75 runCallback();76 };77 78 /**79 * error() calls the onError callbacks passing the error parameter and80 * ends the task by throwing an exception.81 */82 AsyncTask.prototype.error = function(error) {83 utils.logStackTrace();84 if(this.finished === true) {85 return;86 }87 error = error || new Error("Unknown error");88 if(error.message) {89 eventMgr.onError(error);90 }91 runSafe(this, this.errorCallbacks, error);92 // Exit the current call stack93 throw error;94 };95 96 /**97 * retry() can be called in an onRun callback to restart the task98 */99 var currentTaskRunning = false;100 AsyncTask.prototype.retry = function(error, maxRetryCounter) {101 if(this.finished === true) {102 return;103 }104 maxRetryCounter = maxRetryCounter || 5;105 this.queue = undefined;106 if(this.retryCounter >= maxRetryCounter) {107 this.error(error);108 return;109 }110 // Implement an exponential backoff111 var delay = Math.pow(2, this.retryCounter++) * 1000;112 currentTaskStartTime = utils.currentTime + delay;113 currentTaskRunning = false;114 runTask();115 };116 /**117 * enqueue() has to be called to add the task to the task queue118 */119 AsyncTask.prototype.enqueue = function() {120 taskQueue.push(this);121 runTask();122 };123 var asyncRunning = false;124 var currentTask;125 // Determine if user is real by listening to his activity126 var isUserReal = false;127 eventMgr.addListener("onUserActive", function() {128 isUserReal = true;129 });130 131 // Run the next task in the queue if any and no other running132 function runTask() {133 134 // If there is a task currently running135 if(currentTaskRunning === true) {136 // If the current task takes too long137 if(currentTaskStartTime + currentTask.timeout < utils.currentTime) {138 currentTask.error(new Error("A timeout occurred."));139 }140 return;141 }142 if(currentTask === undefined) {143 // If no task in the queue or user has never interacted144 if(taskQueue.length === 0 || (!taskQueue[0].force && isUserReal === false)) {145 return;146 }147 // Dequeue an enqueued task148 currentTask = taskQueue.shift();149 currentTaskStartTime = utils.currentTime;150 if(asyncRunning === false) {151 asyncRunning = true;152 eventMgr.onAsyncRunning(true);153 }154 }155 // Run the task156 if(currentTaskStartTime <= utils.currentTime) {157 currentTaskRunning = true;158 currentTask.chain();159 }160 }161 162 // Call runTask periodically163 eventMgr.addListener("onPeriodicRun", runTask);164 function runSafe(task, callbacks, param) {165 try {166 _.each(callbacks, function(callback) {167 callback(param);168 });169 }170 finally {171 task.finished = true;172 if(currentTask === task) {173 currentTask = undefined;174 currentTaskRunning = false;175 }176 if(taskQueue.length === 0) {177 asyncRunning = false;178 eventMgr.onAsyncRunning(false);179 }180 else {181 runTask();182 }183 }184 }185 return AsyncTask;...
play.js
Source: play.js
...40 function onKill() {41 if (running) running.Kill();42 if (window.notesEnabled) updatePlayStorage('onKill', index);43 }44 function onRun(e) {45 var sk = e.shiftKey || localStorage.getItem('play-shiftKey') === 'true';46 if (running) running.Kill();47 output.style.display = 'block';48 outpre.textContent = '';49 run1.style.display = 'none';50 var options = { Race: sk };51 running = transport.Run(text(code), PlaygroundOutput(outpre), options);52 if (window.notesEnabled) updatePlayStorage('onRun', index, e);53 }54 function onClose() {55 if (running) running.Kill();56 output.style.display = 'none';57 run1.style.display = 'inline-block';58 if (window.notesEnabled) updatePlayStorage('onClose', index);...
CAjax.js
Source: CAjax.js
1var Class = function(sql){2 this.sql = sql;3 this.run = function(req, res){4 if(req.url.split("/")[1] != "ajax"){5 this.onRun(req, res);6 return;7 }8 var request = req, respons = res;9 var self = this;10 if(req.GET["method"] == "list"){11 this.sql.getListResult(function(item){12 if( !item ){13 self.onRun.call(self, request, respons);14 return;15 }16 if( item.date == request.GET["timestamp"] ){17 self.onRun.call(self, request, respons);18 return;19 }20 if(req.GET["pointType"] != 16 && req.GET["pointType"] != 100)21 req.GET["pointType"] = 5;22 var retItem = {}23 retItem.date = item.date;24 retItem.data = Array();25 for(i in item.data){26 retItem.data.push({name: item.data[i].name, date: item.data[i].date, point: item.data[i].point[req.GET["pointType"]]});27 }28 self.onRun.call(self, request, respons, retItem);29 });30 return;31 }32 if(req.GET["method"] == "statistic"){33 this.sql.getStatisticsData(function(item){34 if( !item ){35 self.onRun.call(self, request, respons);36 return;37 }38 if( item.date == request.GET["timestamp"] ){39 self.onRun.call(self, request, respons);40 return;41 }42 if(req.GET["pointType"] != 16 && req.GET["pointType"] != 100)43 req.GET["pointType"] = 5;44 var retItem = {}45 retItem.date = item.date;46 retItem.data = {};47 retItem.data.theme = item.data.theme;48 retItem.data.point = item.data.point[req.GET["pointType"]];49 self.onRun.call(self, request, respons, retItem);50 });51 return;52 }53 this.onRun(req, res);54 }55 this.onRun = function(req, res, data){56 var content = "";57 if(data)58 content = JSON.stringify(data);59 res.writeHead(200,{"Content-Type": "text/html"});60 res.write(content);61 res.end();62 }63}...
CAPI.js
Source: CAPI.js
...9 }10 this.run = function(req, res){11 var self = this; 12 if(req.url.split("/")[1] != "api"){13 this.onRun(req, res, {status: 404, data: {description:"Request is not api request", code: 404}});14 return;15 }16 if(req.GET["token"] != this.token){17 this.onRun(req, res, {status: 400, data:{description:"Wrong token", code:400}});18 return;19 }20 if(req.GET["method"] == "addNewResult"){21 if(!this.checkParams(req.GET,{"name": 3, "point": 0, "theme": 0})){22 this.onRun(req, res, {status: 400, data:{description:"Wrong input parametrs", code:400}});23 return;24 }25 this.sql.addNewResultTest(req.GET["name"], req.GET["point"], req.GET["theme"], function(data, err){26 self.onRun.call(self, req, res, {status: 200, data: {description:"OK", code:200, data: data}});27 });28 return;29 }30 if(req.GET["method"] == "getListResult"){31 this.sql.getListResult(function(data){32 self.onRun.call(self, req, res, {status: 200, data: {description:"OK", code:200, data: data.data}});33 });34 return;35 }36 this.onRun(req, res, {status: 400, data: { description: "Wrong method", code: 400}});37 }38 this.onRun = function(req, res, data){39 var status = 200;40 var body = "";41 if(data && data.status)42 status = data.status;43 if(data && data.data)44 body = JSON.stringify(data.data);45 res.writeHead(status, {"Content-Type": "text/html"});46 res.write(body);47 res.end();48 }49};50module.exports = Class;
RunDropdown.js
Source: RunDropdown.js
...12 <div style={styles.buttons.run.dropdownContainer}>13 <Button14 style={styles.buttons.run.dropdownButtons}15 onClick={() => {16 this.props.onRun(this.props.source);17 this.props.collapse();18 }}19 >20 Run21 </Button>22 <Button23 style={styles.buttons.run.dropdownButtons}24 onClick={() => {25 this.props.onRun(this.props.source);26 this.props.collapse();27 }}28 >29 Typecheck & Run30 </Button>31 </div>32 );33 }34 return null;35 }36}37RunDropdown.propTypes = {38 expanded: React.PropTypes.bool,39 onRun: React.PropTypes.func,40 source: React.PropTypes.string,41 collapse: React.PropTypes.func,42};43export default connect(44 state => ({45 expanded: isRunDropdownExpanded(state),46 source: getSource(state),47 }),48 dispatch => ({49 onRun(src) {50 dispatch(clearState());51 dispatch(run(src));52 },53 collapse() {54 dispatch(collapseRunDropdown());55 }...
Using AI Code Generation
1describe('My First Test', function() {2 it('Does not do much!', function() {3 cy.contains('type').click()4 cy.url().should('include', '/commands/actions')5 cy.get('.action-email')6 .type('
Using AI Code Generation
1on('before:browser:launch', (browser = {}, args) => {2 if (browser.name === 'chrome' && browser.isHeadless) {3 args.push('--disable-dev-shm-usage')4 }5 })6{7}8{9 "env": {10 }11}
Using AI Code Generation
1describe('My First Test', () => {2 it('Does not do much!', () => {3 expect(true).to.equal(true)4 })5})6describe('My First Test', () => {7 it('Does not do much!', () => {8 expect(true).to.equal(true)9 })10})11describe('My First Test', () => {12 it('Does not do much!', () => {13 expect(true).to.equal(true)14 })15})16describe('My First Test', () => {17 it('Does not do much!', () => {18 expect(true).to.equal(true)19 })20})21describe('My First Test', () => {22 it('Does not do much!', () => {23 expect(true).to.equal(true)24 })25})26describe('My First Test', () => {27 it('Does not do much!', () => {28 expect(true).to.equal(true)29 })30})31describe('My First Test', () => {32 it('Does not do much!', () => {33 expect(true).to.equal(true)34 })35})36describe('My First Test', () => {37 it('Does not do much!', () => {38 expect(true).to.equal(true)39 })40})41describe('My First Test', () => {42 it('Does not do much!', () => {43 expect(true).to.equal(true)44 })45})46describe('My First Test', () => {47 it('Does not do much!', () => {48 expect(true).to.equal(true)49 })50})51describe('My First Test', () => {52 it('Does not do much!', () => {53 expect(true).to.equal(true)54 })55})56describe('My First Test', () => {57 it('Does not do much!', ()
Using AI Code Generation
1describe('My First Test', function() {2 it('Does not do much!', function() {3 expect(true).to.equal(true)4 })5})6Cypress.on('test:after:run', (test, runnable) => {7 if (test.state === 'failed') {8 const screenshot = `${Cypress.config('screenshotsFolder')}/${Cypress.spec.name}/${runnable.parent.title} -- ${test.title} (failed).png`9 addContext({ test }, screenshot)10 }11})12Cypress.on('test:after:run', (test, runnable) => {13 if (test.state === 'failed') {14 const video = `${Cypress.config('videosFolder')}/${Cypress.spec.name}.mp4`15 addContext({ test }, video)16 }17})18Cypress.on('test:after:run', (test, runnable) => {19 if (test.state === 'failed') {20 const video = `${Cypress.config('videosFolder')}/${Cypress.spec.name}.mp4`21 const screenshot = `${Cypress.config('screenshotsFolder')}/${Cypress.spec.name}/${runnable.parent.title} -- ${test.title} (failed).png`22 addContext({ test }, video)23 addContext({ test }, screenshot)24 }25})26Cypress.on('test:after:run', (test, runnable) => {27 if (test.state === 'failed') {28 const video = `${Cypress.config('videosFolder')}/${Cypress.spec.name}.mp4`29 const screenshot = `${Cypress.config('screenshotsFolder')}/${Cypress.spec.name}/${runnable.parent.title} -- ${test.title} (failed).png`30 addContext({ test }, video)31 addContext({ test }, screenshot)32 }33 else {34 const video = `${Cypress.config('videosFolder')}/${Cypress.spec.name}.mp4`35 addContext({ test }, video)36 }37})38Cypress.on('test:after:run', (test, runnable) => {39 if (test.state === 'failed') {40 const screenshot = `${Cypress.config('screenshotsFolder')}/${Cypress.spec.name}/${runnable.parent.title}
Using AI Code Generation
1describe('My First Test', function() {2 it('Does not do much!', function() {3 expect(true).to.equal(true)4 })5})6{7}8{9 "scripts": {10 },11 "devDependencies": {12 }13}
Using AI Code Generation
1describe('My First Test', function() {2 it('Does not do much!', function() {3 expect(true).to.equal(true)4 })5})6{7 "testFiles": "**/*.{feature,features}",8 "env": {9 }10}11describe('My First Test', function() {12 it('Does not do much!', function() {13 expect(true).to.equal(true)14 })15})16module.exports = (on, config) => {17 if(cypress_run) {18 config.testFiles = `**/${cypress_run}.*`19 }20}21Given('I visit {string}', (url) => {22 cy.visit(url)23})24Then('I see {string}', (text) => {25 cy.contains(text)26})27Given('I visit {string}', (url) => {28 cy.visit(url)29})30Then('I see {string}', (text) => {31 cy.contains(text)32})33Given('I visit {string}', (url) => {34 cy.visit(url)35})36Then('I see {string}', (text) => {37 cy.contains(text)38})
Using AI Code Generation
1Cypress.Commands.add('onRun', () => {2 console.log('onRun')3})4describe('onRun', () => {5 it('runs', () => {6 cy.onRun()7 })8})9describe('onRun', () => {10 beforeEach(() => {11 cy.onRun()12 })13 it('runs', () => {14 cy.onRun()15 })16})17describe('onRun', () => {18 before(() => {19 cy.onRun()20 })21 it('runs', () => {22 cy.onRun()23 })24})25describe('onRun', () => {26 before(() => {27 cy.onRun()28 })29 beforeEach(() => {30 cy.onRun()31 })32 it('runs', () => {33 cy.onRun()34 })35})36describe('onRun', () => {37 before(() => {38 cy.onRun()39 })40 beforeEach(() => {41 cy.onRun()42 })43 afterEach(() => {44 cy.onRun()45 })46 it('runs', () => {47 cy.onRun()48 })49})50describe('onRun', () => {51 before(() => {52 cy.onRun()53 })54 beforeEach(() => {55 cy.onRun()56 })57 afterEach(() => {58 cy.onRun()59 })60 it('runs', () => {61 cy.onRun()62 })63})
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I'm currently working at a large well-known company on our test tools and frameworks team. So while I'm no expert, it is something that's part of my job. I'm going to be talking specifically about web testing. Testing is somewhat different for native apps like iOS and Android and I'm not super familiar with those aspects.
The terminology between e2e (end to end) and integration tests is somewhat interchangeable, while unit tests have a more specific definition.
Generally e2e/integration tests should be runnable in dev and production environments. Depending on your setup, your dev environment is probably using some semi-frequently updated snapshot of your production db. In other cases, your local environment may be hitting the actual production db. There are pros/cons to both approaches, but it largely depends on the scale of your company or project. For example, if you're at a large company with dedicated teams you can see many changes a day hitting production databases vs a small team where a weekly snapshot of the prod db is probably good enough for testing locally. i At the base level, all integration tests should be treated as real. When dealing with web apps there are lots of other factors we have to take into account like different web browsers, network activity / availability, etc. So mocking out data for api calls would allow for super fast testing, but then adds another level of complexity with making sure the mocks stay up to date with the real-world database.
Running integration tests locally should more or less be doing the same thing against your dev server that they will be doing against staging and production. With the exception of having the app detecting whether its running in a dev, staging, or production environment to switch out URL's and various credentials, the app should be expected to behave exactly the same way.
In regards to your question about authentication, the answer is yes. Lets look at 2 examples that show different considerations.
Suppose your project is very small. You create some real accounts on production and your db gets snapshotted weekly for use in your local dev environment. You just run your integration tests with one or more of those users as needed. Since the local tests are only hitting your local db, you don't need to worry about the data being generated since it won't affect production. Other engineers on your team can use the same user(s) and not worry about it. If one engineer makes some changes to the db schema, ORM, etc then everyone just gets a new copy of the db snapshot and continues working.
Now for the other extreme. Suppose your project is very big. Millions of users and hundreds of employees all collectively making changes to the codebase and db every day. There are all kinds of ways that infrastructures are setup to handle various engineering tasks. There's too much data and the db changes too often to make using local snapshots feasible. At this scale, you're probably doing continuous integration and running your tests on every commit. You want to do that so that incoming changes don't make it to production and cause major problems. You're probably running your local dev environments against either a constantly updated staging database, or perhaps even against your production db itself. (Try planning for the staging db as it avoids a lot of other problems.)
Now, having just a small set of dedicated test users starts to be a problem. Tests are running all the time, both automated and by dozens of engineers all working on their own bits of work. Since the staging db is probably shared, you easily start getting weird conflicts as the same test user is doing all kinds of things and starts causing tests to fail. A good solution I've seen for this is a kind of test account checkout server. You create say 100 or 1000 (or more) test user accounts. When your integration tests run, they literally check out a test user account from the server. When the tests are done, the integration tests clean up whatever changes they made on that user and tell the checkout server that the user is free again. Then it randomly gets checked out by someone/something else and the cycle continues.
So the take aways that related directly to your question:
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