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

How to use unstable_trace method in Playwright Internal

Best JavaScript code snippet using playwright-internal

Tracing-test.internal.js

Source:Tracing-test.internal.js

...27  describe('enableSchedulerTracing enabled', () => {28    beforeEach(() => loadModules({enableSchedulerTracing: true}));29    it('should return the value of a traced function', () => {30      expect(31        SchedulerTracing.unstable_trace('arbitrary', currentTime, () => 123),32      ).toBe(123);33    });34    it('should return the value of a clear function', () => {35      expect(SchedulerTracing.unstable_clear(() => 123)).toBe(123);36    });37    it('should return the value of a wrapped function', () => {38      let wrapped;39      SchedulerTracing.unstable_trace('arbitrary', currentTime, () => {40        wrapped = SchedulerTracing.unstable_wrap(() => 123);41      });42      expect(wrapped()).toBe(123);43    });44    it('should pass arguments through to a wrapped function', done => {45      let wrapped;46      SchedulerTracing.unstable_trace('arbitrary', currentTime, () => {47        wrapped = SchedulerTracing.unstable_wrap((param1, param2) => {48          expect(param1).toBe('foo');49          expect(param2).toBe('bar');50          done();51        });52      });53      wrapped('foo', 'bar');54    });55    it('should return an empty set when outside of a traced event', () => {56      expect(SchedulerTracing.unstable_getCurrent()).toContainNoInteractions();57    });58    it('should report the traced interaction from within the trace callback', done => {59      advanceTimeBy(100);60      SchedulerTracing.unstable_trace('some event', currentTime, () => {61        const interactions = SchedulerTracing.unstable_getCurrent();62        expect(interactions).toMatchInteractions([63          {name: 'some event', timestamp: 100},64        ]);65        done();66      });67    });68    it('should report the traced interaction from within wrapped callbacks', done => {69      let wrappedIndirection;70      function indirection() {71        const interactions = SchedulerTracing.unstable_getCurrent();72        expect(interactions).toMatchInteractions([73          {name: 'some event', timestamp: 100},74        ]);75        done();76      }77      advanceTimeBy(100);78      SchedulerTracing.unstable_trace('some event', currentTime, () => {79        wrappedIndirection = SchedulerTracing.unstable_wrap(indirection);80      });81      advanceTimeBy(50);82      wrappedIndirection();83    });84    it('should clear the interaction stack for traced callbacks', () => {85      let innerTestReached = false;86      SchedulerTracing.unstable_trace('outer event', currentTime, () => {87        expect(SchedulerTracing.unstable_getCurrent()).toMatchInteractions([88          {name: 'outer event'},89        ]);90        SchedulerTracing.unstable_clear(() => {91          expect(SchedulerTracing.unstable_getCurrent()).toMatchInteractions(92            [],93          );94          SchedulerTracing.unstable_trace('inner event', currentTime, () => {95            expect(SchedulerTracing.unstable_getCurrent()).toMatchInteractions([96              {name: 'inner event'},97            ]);98            innerTestReached = true;99          });100        });101        expect(SchedulerTracing.unstable_getCurrent()).toMatchInteractions([102          {name: 'outer event'},103        ]);104      });105      expect(innerTestReached).toBe(true);106    });107    it('should clear the interaction stack for wrapped callbacks', () => {108      let innerTestReached = false;109      let wrappedIndirection;110      const indirection = jest.fn(() => {111        expect(SchedulerTracing.unstable_getCurrent()).toMatchInteractions([112          {name: 'outer event'},113        ]);114        SchedulerTracing.unstable_clear(() => {115          expect(SchedulerTracing.unstable_getCurrent()).toMatchInteractions(116            [],117          );118          SchedulerTracing.unstable_trace('inner event', currentTime, () => {119            expect(SchedulerTracing.unstable_getCurrent()).toMatchInteractions([120              {name: 'inner event'},121            ]);122            innerTestReached = true;123          });124        });125        expect(SchedulerTracing.unstable_getCurrent()).toMatchInteractions([126          {name: 'outer event'},127        ]);128      });129      SchedulerTracing.unstable_trace('outer event', currentTime, () => {130        wrappedIndirection = SchedulerTracing.unstable_wrap(indirection);131      });132      wrappedIndirection();133      expect(innerTestReached).toBe(true);134    });135    it('should support nested traced events', done => {136      advanceTimeBy(100);137      let innerIndirectionTraced = false;138      let outerIndirectionTraced = false;139      function innerIndirection() {140        const interactions = SchedulerTracing.unstable_getCurrent();141        expect(interactions).toMatchInteractions([142          {name: 'outer event', timestamp: 100},143          {name: 'inner event', timestamp: 150},144        ]);145        innerIndirectionTraced = true;146      }147      function outerIndirection() {148        const interactions = SchedulerTracing.unstable_getCurrent();149        expect(interactions).toMatchInteractions([150          {name: 'outer event', timestamp: 100},151        ]);152        outerIndirectionTraced = true;153      }154      SchedulerTracing.unstable_trace('outer event', currentTime, () => {155        // Verify the current traced event156        let interactions = SchedulerTracing.unstable_getCurrent();157        expect(interactions).toMatchInteractions([158          {name: 'outer event', timestamp: 100},159        ]);160        advanceTimeBy(50);161        const wrapperOuterIndirection = SchedulerTracing.unstable_wrap(162          outerIndirection,163        );164        let wrapperInnerIndirection;165        let innerEventTraced = false;166        // Verify that a nested event is properly traced167        SchedulerTracing.unstable_trace('inner event', currentTime, () => {168          interactions = SchedulerTracing.unstable_getCurrent();169          expect(interactions).toMatchInteractions([170            {name: 'outer event', timestamp: 100},171            {name: 'inner event', timestamp: 150},172          ]);173          // Verify that a wrapped outer callback is properly traced174          wrapperOuterIndirection();175          expect(outerIndirectionTraced).toBe(true);176          wrapperInnerIndirection = SchedulerTracing.unstable_wrap(177            innerIndirection,178          );179          innerEventTraced = true;180        });181        expect(innerEventTraced).toBe(true);182        // Verify that the original event is restored183        interactions = SchedulerTracing.unstable_getCurrent();184        expect(interactions).toMatchInteractions([185          {name: 'outer event', timestamp: 100},186        ]);187        // Verify that a wrapped nested callback is properly traced188        wrapperInnerIndirection();189        expect(innerIndirectionTraced).toBe(true);190        done();191      });192    });193    describe('error handling', () => {194      it('should reset state appropriately when an error occurs in a trace callback', done => {195        advanceTimeBy(100);196        SchedulerTracing.unstable_trace('outer event', currentTime, () => {197          expect(() => {198            SchedulerTracing.unstable_trace('inner event', currentTime, () => {199              throw Error('intentional');200            });201          }).toThrow();202          expect(SchedulerTracing.unstable_getCurrent()).toMatchInteractions([203            {name: 'outer event', timestamp: 100},204          ]);205          done();206        });207      });208      it('should reset state appropriately when an error occurs in a wrapped callback', done => {209        advanceTimeBy(100);210        SchedulerTracing.unstable_trace('outer event', currentTime, () => {211          let wrappedCallback;212          SchedulerTracing.unstable_trace('inner event', currentTime, () => {213            wrappedCallback = SchedulerTracing.unstable_wrap(() => {214              throw Error('intentional');215            });216          });217          expect(wrappedCallback).toThrow();218          expect(SchedulerTracing.unstable_getCurrent()).toMatchInteractions([219            {name: 'outer event', timestamp: 100},220          ]);221          done();222        });223      });224    });225    describe('advanced integration', () => {226      it('should return a unique threadID per request', () => {227        expect(SchedulerTracing.unstable_getThreadID()).not.toBe(228          SchedulerTracing.unstable_getThreadID(),229        );230      });231      it('should expose the current set of interactions to be externally manipulated', () => {232        SchedulerTracing.unstable_trace('outer event', currentTime, () => {233          expect(SchedulerTracing.__interactionsRef.current).toBe(234            SchedulerTracing.unstable_getCurrent(),235          );236          SchedulerTracing.__interactionsRef.current = new Set([237            {name: 'override event'},238          ]);239          expect(SchedulerTracing.unstable_getCurrent()).toMatchInteractions([240            {name: 'override event'},241          ]);242        });243      });244      it('should expose a subscriber ref to be externally manipulated', () => {245        SchedulerTracing.unstable_trace('outer event', currentTime, () => {246          expect(SchedulerTracing.__subscriberRef).toEqual({247            current: null,248          });249        });250      });251    });252  });253  describe('enableSchedulerTracing disabled', () => {254    beforeEach(() => loadModules({enableSchedulerTracing: false}));255    it('should return the value of a traced function', () => {256      expect(257        SchedulerTracing.unstable_trace('arbitrary', currentTime, () => 123),258      ).toBe(123);259    });260    it('should return the value of a wrapped function', () => {261      let wrapped;262      SchedulerTracing.unstable_trace('arbitrary', currentTime, () => {263        wrapped = SchedulerTracing.unstable_wrap(() => 123);264      });265      expect(wrapped()).toBe(123);266    });267    it('should return null for traced interactions', () => {268      expect(SchedulerTracing.unstable_getCurrent()).toBe(null);269    });270    it('should execute traced callbacks', done => {271      SchedulerTracing.unstable_trace('some event', currentTime, () => {272        expect(SchedulerTracing.unstable_getCurrent()).toBe(null);273        done();274      });275    });276    it('should return the value of a clear function', () => {277      expect(SchedulerTracing.unstable_clear(() => 123)).toBe(123);278    });279    it('should execute wrapped callbacks', done => {280      const wrappedCallback = SchedulerTracing.unstable_wrap(() => {281        expect(SchedulerTracing.unstable_getCurrent()).toBe(null);282        done();283      });284      wrappedCallback();285    });...

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const context = await browser.newContext();5  const page = await context.newPage();6  const trace = await page.context().newTrace();7  await trace.start({ screenshots: true, snapshots: true });8  await page.click('text=Show more');9  await trace.stop({ path: 'trace.zip' });10  await browser.close();11})();

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  await page.unstable_trace('trace.zip');6  await browser.close();7})();

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const context = await browser.newContext();5  const page = await context.newPage();6  page.on('pageerror', err => {7    console.log(err);8  });9  await page.click('text=No thanks');10  await page.click('text=Sign in');11  await page.click('text=Sign in');12  await browser.close();13})();14    at assertExecutionContext (/Users/xxxxxx/xxxxxx/xxxxxx/xxxxxx/xxxxxx/node_modules/playwright/lib/server/frames.js:138:13)15    at Frame._click (/Users/xxxxxx/xxxxxx/xxxxxx/xxxxxx/xxxxxx/xxxxxx/node_modules/playwright/lib/server/frames.js:444:5)16    at Frame.click (/Users/xxxxxx/xxxxxx/xxxxxx/xxxxxx/xxxxxx/xxxxxx/node_modules/playwright/lib/server/frames.js:433:21)17    at Page.click (/Users/xxxxxx/xxxxxx/xxxxxx/xxxxxx/xxxxxx/xxxxxx/node_modules/playwright/lib/server/page.js:1010:31)18    at main (/Users/xxxxxx/xxxxxx/xxxxxx/xxxxxx/xxxxxx/xxxxxx/test.js:15:10)19    at processTicksAndRejections (internal/process/task_queues.js:95:5)20await page.waitForLoadState('networkidle');21await page.waitForNavigation();22await page.waitForLoadState('load');23await page.waitForLoadState('domcontentloaded');24await page.waitForLoadState('networkidle');

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch({ headless: false });4  const context = await browser.newContext();5  const page = await context.newPage();6  await page.screenshot({ path: `example.png` });7  await browser.close();8})();

Using AI Code Generation

1const playwright = require('playwright');2(async () => {3  const browser = await playwright.chromium.launch();4  const page = await browser.newPage();5  const trace = await page._trace.start({ screenshots: true, snapshots: true });6  await page.click('text=Get Started');7  await page.close();8  await browser.close();9  await trace.stop({ path: 'trace.zip' });10})();

Using AI Code Generation

1const { chromium } = require("playwright");2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  const trace = await page._context._browserContext._browser._channel.unstable_trace({ screenshots: true, snapshots: true });6  await page.click("text=Get started");7  await page.close();8  await browser.close();9  const result = await trace.stop();10  console.log(result);11})();12    at ChannelOwner._wrapApiCall (/Users/XXX/Projects/playwright/trace/node_modules/playwright/lib/protocol/channels.js:411:20)13    at ChannelOwner._wrapApiCall (/Users/XXX/Projects/playwright/trace/node_modules/playwright/lib/protocol/channels.js:413:20)14    at ChannelOwner._wrapApiCall (/Users/XXX/Projects/playwright/trace/node_modules/playwright/lib/protocol/channels.js:413:20)15    at ChannelOwner._wrapApiCall (/Users/XXX/Projects/playwright/trace/node_modules/playwright/lib/protocol/channels.js:413:20)16    at ChannelOwner._wrapApiCall (/Users/XXX/Projects/playwright/trace/node_modules/playwright/lib/protocol/channels.js:413:20)17    at ChannelOwner._wrapApiCall (/Users/XXX/Projects/playwright/trace/node_modules/playwright/lib/protocol/channels.js:413:20)18    at ChannelOwner._wrapApiCall (/Users/XXX/Projects/playwright/trace/node_modules/playwright/lib/protocol/channels.js:413:20)19    at ChannelOwner._wrapApiCall (/Users/XXX/Projects/playwright/trace/node_modules/playwright/lib/protocol/channels.js:413:20)20    at ChannelOwner._wrapApiCall (/Users/XXX/Projects/playwright/trace/node_modules/playwright/lib/protocol/channels.js:413:20)

Using AI Code Generation

1const playwright = require('playwright');2const trace = require('playwright/lib/trace/recorder');3const fs = require('fs');4(async () => {5  const browser = await playwright.chromium.launch();6  const context = await browser.newContext();7  const page = await context.newPage();8  const tracePath = 'trace.json';9  await trace.start(page, tracePath);10  await trace.stop(page);11  await browser.close();12})();13{14  "metadata": {15  },16    {17      "page": {18        "frame": {19        }20      },21        {22          "data": {23          }24        },25        {26          "data": {27            "responseHeaders": {28              "content-type": "text/html; charset=utf-8",29              "x-xss-protection": "1; mode=block"30            },31          }32        },33        {34          "data": {

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch({ headless: false });4  const context = await browser.newContext();5  await context.tracing.start({ screenshots: true, snapshots: true });6  const page = await context.newPage();7  await context.tracing.stop({ path: 'trace.zip' });8  await browser.close();9})();

Playwright tutorial

LambdaTest’s Playwright tutorial will give you a broader idea about the Playwright automation framework, its unique features, and use cases with examples to exceed your understanding of Playwright testing. This tutorial will give A to Z guidance, from installing the Playwright framework to some best practices and advanced concepts.

Chapters:

What is Playwright : Playwright is comparatively new but has gained good popularity. Get to know some history of the Playwright with some interesting facts connected with it.
How To Install Playwright : Learn in detail about what basic configuration and dependencies are required for installing Playwright and run a test. Get a step-by-step direction for installing the Playwright automation framework.
Playwright Futuristic Features: Launched in 2020, Playwright gained huge popularity quickly because of some obliging features such as Playwright Test Generator and Inspector, Playwright Reporter, Playwright auto-waiting mechanism and etc. Read up on those features to master Playwright testing.
What is Component Testing: Component testing in Playwright is a unique feature that allows a tester to test a single component of a web application without integrating them with other elements. Learn how to perform Component testing on the Playwright automation framework.
Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
Functions and Selectors in Playwright: Learn how to launch the Chromium browser with Playwright. Also, gain a better understanding of some important functions like “BrowserContext,” which allows you to run multiple browser sessions, and “newPage” which interacts with a page.
Handling Alerts and Dropdowns in Playwright : Playwright interact with different types of alerts and pop-ups, such as simple, confirmation, and prompt, and different types of dropdowns, such as single selector and multi-selector get your hands-on with handling alerts and dropdown in Playright testing.
Playwright vs Puppeteer: Get to know about the difference between two testing frameworks and how they are different than one another, which browsers they support, and what features they provide.
Run Playwright Tests on LambdaTest: Playwright testing with LambdaTest leverages test performance to the utmost. You can run multiple Playwright tests in Parallel with the LammbdaTest test cloud. Get a step-by-step guide to run your Playwright test on the LambdaTest platform.
Playwright Python Tutorial: Playwright automation framework support all major languages such as Python, JavaScript, TypeScript, .NET and etc. However, there are various advantages to Python end-to-end testing with Playwright because of its versatile utility. Get the hang of Playwright python testing with this chapter.
Playwright End To End Testing Tutorial: Get your hands on with Playwright end-to-end testing and learn to use some exciting features such as TraceViewer, Debugging, Networking, Component testing, Visual testing, and many more.
Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.