KaneAI - World’s First E2E Software Testing Agent.Book a Demo Join TestMu Conference

How to use assert_to_be_golden method in Playwright Python

Best Python code snippet using playwright-python

test_interception.py

Source:test_interception.py

...572        server.PREFIX,573    )574    img = await page.query_selector("img")575    assert img576    assert_to_be_golden(await img.screenshot(), "mock-binary-response.png")577async def test_request_fulfill_should_allow_mocking_svg_with_charset(578    page, server, assert_to_be_golden579):580    await page.route(581        "**/*",582        lambda route: route.fulfill(583            content_type="image/svg+xml ; charset=utf-8",584            body='<svg width="50" height="50" version="1.1" xmlns="http://www.w3.org/2000/svg"><rect x="10" y="10" width="30" height="30" stroke="black" fill="transparent" stroke-width="5"/></svg>',585        ),586    )587    await page.evaluate(588        """PREFIX => {589      const img = document.createElement('img');590      img.src = PREFIX + '/does-not-exist.svg';591      document.body.appendChild(img);592      return new Promise((f, r) => { img.onload = f; img.onerror = r; });593    }""",594        server.PREFIX,595    )596    img = await page.query_selector("img")597    assert_to_be_golden(await img.screenshot(), "mock-svg.png")598async def test_request_fulfill_should_work_with_file_path(599    page: Page, server, assert_to_be_golden, assetdir600):601    await page.route(602        "**/*",603        lambda route: route.fulfill(604            content_type="shouldBeIgnored", path=assetdir / "pptr.png"605        ),606    )607    await page.evaluate(608        """PREFIX => {609      const img = document.createElement('img');610      img.src = PREFIX + '/does-not-exist.png';611      document.body.appendChild(img);612      return new Promise(fulfill => img.onload = fulfill);613    }""",614        server.PREFIX,615    )616    img = await page.query_selector("img")617    assert img618    assert_to_be_golden(await img.screenshot(), "mock-binary-response.png")619async def test_request_fulfill_should_stringify_intercepted_request_response_headers(620    page, server621):622    await page.route(623        "**/*",624        lambda route: route.fulfill(625            status=200, headers={"foo": True}, body="Yo, page!"626        ),627    )628    response = await page.goto(server.EMPTY_PAGE)629    assert response.status == 200630    headers = response.headers631    assert headers["foo"] == "True"632    assert await page.evaluate("() => document.body.textContent") == "Yo, page!"...

test_locators.py

Source:test_locators.py

...287    )288    page.goto(server.PREFIX + "/grid.html")289    page.evaluate("window.scrollBy(50, 100)")290    element = page.locator(".box:nth-of-type(3)")291    assert_to_be_golden(element.screenshot(), "screenshot-element-bounding-box.png")292def test_locators_should_return_bounding_box(page: Page, server: Server) -> None:293    page.set_viewport_size(294        {295            "width": 500,296            "height": 500,297        }298    )299    page.goto(server.PREFIX + "/grid.html")300    element = page.locator(".box:nth-of-type(13)")301    box = element.bounding_box()302    assert box == {303        "x": 100,304        "y": 50,305        "width": 50,...

test_emulation_focus.py

Source:test_emulation_focus.py

...98    screenshots = await asyncio.gather(99        page.screenshot(),100        page2.screenshot(),101    )102    assert_to_be_golden(screenshots[0], "screenshot-sanity.png")103    assert_to_be_golden(screenshots[1], "grid-cell-0.png")104async def test_should_change_focused_iframe(page, server, utils):105    await page.goto(server.EMPTY_PAGE)106    [frame1, frame2] = await asyncio.gather(107        utils.attach_frame(page, "frame1", server.PREFIX + "/input/textarea.html"),108        utils.attach_frame(page, "frame2", server.PREFIX + "/input/textarea.html"),109    )110    logger = """() => {111        self._events = [];112        const element = document.querySelector('input');113        element.onfocus = element.onblur = (e) => self._events.push(e.type);114    }"""115    await asyncio.gather(116        frame1.evaluate(logger),117        frame2.evaluate(logger),...

conftest.py

Source:conftest.py

...117        default=False,118        help="Run tests in headful mode.",119    )120@pytest.fixture(scope="session")121def assert_to_be_golden(browser_name: str):122    def compare(received_raw: bytes, golden_name: str):123        golden_file = (_dirname / f"golden-{browser_name}" / golden_name).read_bytes()124        received_image = Image.open(io.BytesIO(received_raw))125        golden_image = Image.open(io.BytesIO(golden_file))126        if golden_image.size != received_image.size:127            pytest.fail("Image size differs to golden image")128            return129        diff_pixels = pixelmatch(130            from_PIL_to_raw_data(received_image),131            from_PIL_to_raw_data(golden_image),132            golden_image.size[0],133            golden_image.size[1],134            threshold=0.2,135        )...

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.