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

How to use emulate_media method in Playwright Python

Best Python code snippet using playwright-python

test_page.py

Source:test_page.py

...966async def test_should_emulate_reduced_motion(page, server):967    assert await page.evaluate(968        "matchMedia('(prefers-reduced-motion: no-preference)').matches"969    )970    await page.emulate_media(reduced_motion="reduce")971    assert await page.evaluate("matchMedia('(prefers-reduced-motion: reduce)').matches")972    assert not await page.evaluate(973        "matchMedia('(prefers-reduced-motion: no-preference)').matches"974    )975    await page.emulate_media(reduced_motion="no-preference")976    assert not await page.evaluate(977        "matchMedia('(prefers-reduced-motion: reduce)').matches"978    )979    assert await page.evaluate(980        "matchMedia('(prefers-reduced-motion: no-preference)').matches"981    )982async def test_input_value(page: Page, server: Server):983    await page.goto(server.PREFIX + "/input/textarea.html")984    await page.fill("input", "my-text-content")985    assert await page.input_value("input") == "my-text-content"986    await page.fill("input", "")987    assert await page.input_value("input") == ""988async def test_drag_and_drop_helper_method(page: Page, server: Server):989    await page.goto(server.PREFIX + "/drag-n-drop.html")990    await page.drag_and_drop("#source", "#target")991    assert (992        await page.eval_on_selector(993            "#target", "target => target.contains(document.querySelector('#source'))"994        )995        is True996    )997async def test_drag_and_drop_with_position(page: Page, server: Server):998    await page.goto(server.EMPTY_PAGE)999    await page.set_content(1000        """1001      <div style="width:100px;height:100px;background:red;" id="red">1002      </div>1003      <div style="width:100px;height:100px;background:blue;" id="blue">1004      </div>1005    """1006    )1007    events_handle = await page.evaluate_handle(1008        """1009        () => {1010        const events = [];1011        document.getElementById('red').addEventListener('mousedown', event => {1012            events.push({1013            type: 'mousedown',1014            x: event.offsetX,1015            y: event.offsetY,1016            });1017        });1018        document.getElementById('blue').addEventListener('mouseup', event => {1019            events.push({1020            type: 'mouseup',1021            x: event.offsetX,1022            y: event.offsetY,1023            });1024        });1025        return events;1026        }1027    """1028    )1029    await page.drag_and_drop(1030        "#red",1031        "#blue",1032        source_position={"x": 34, "y": 7},1033        target_position={"x": 10, "y": 20},1034    )1035    assert await events_handle.json_value() == [1036        {"type": "mousedown", "x": 34, "y": 7},1037        {"type": "mouseup", "x": 10, "y": 20},1038    ]1039async def test_should_check_box_using_set_checked(page: Page):1040    await page.set_content("`<input id='checkbox' type='checkbox'></input>`")1041    await page.set_checked("input", True)1042    assert await page.evaluate("checkbox.checked") is True1043    await page.set_checked("input", False)1044    assert await page.evaluate("checkbox.checked") is False1045async def test_should_set_bodysize_and_headersize(page: Page, server: Server):1046    await page.goto(server.EMPTY_PAGE)1047    async with page.expect_request("*/**") as request_info:1048        await page.evaluate(1049            "() => fetch('./get', { method: 'POST', body: '12345'}).then(r => r.text())"1050        )1051    request = await request_info.value1052    sizes = await request.sizes()1053    assert sizes["requestBodySize"] == 51054    assert sizes["requestHeadersSize"] >= 3001055async def test_should_set_bodysize_to_0(page: Page, server: Server):1056    await page.goto(server.EMPTY_PAGE)1057    async with page.expect_request("*/**") as request_info:1058        await page.evaluate("() => fetch('./get').then(r => r.text())")1059    request = await request_info.value1060    sizes = await request.sizes()1061    assert sizes["requestBodySize"] == 01062    assert sizes["requestHeadersSize"] >= 2001063@pytest.mark.skip_browser("webkit")  # https://bugs.webkit.org/show_bug.cgi?id=2252811064async def test_should_emulate_forced_colors(page):1065    assert await page.evaluate("matchMedia('(forced-colors: none)').matches")1066    await page.emulate_media(forced_colors="none")1067    assert await page.evaluate("matchMedia('(forced-colors: none)').matches")1068    assert not await page.evaluate("matchMedia('(forced-colors: active)').matches")1069    await page.emulate_media(forced_colors="active")1070    assert await page.evaluate("matchMedia('(forced-colors: active)').matches")1071    assert not await page.evaluate("matchMedia('(forced-colors: none)').matches")1072async def test_should_not_throw_when_continuing_while_page_is_closing(1073    page: Page, server: Server1074):1075    done = None1076    def handle_route(route: Route) -> None:1077        nonlocal done1078        done = asyncio.gather(route.continue_(), page.close())1079    await page.route("**/*", handle_route)1080    with pytest.raises(Error):1081        await page.goto(server.EMPTY_PAGE)1082    await done1083async def test_should_not_throw_when_continuing_after_page_is_closed(...

feedsdb.py

Source:feedsdb.py

...212                }213            }''')214        mediatype = spec.pop('mediatype', None)215        if mediatype is not None:216            await page.emulate_media(media = mediatype)217        await page.wait_for_timeout(500)218        await page.pdf(**spec)219    async def get_pdf(browser, spec):220        context_opts = dict(221            accept_downloads = True,222            java_script_enabled = False,223            color_scheme = 'light'224        )225        if 'useragent' in spec:226            context_opts['user_agent'] = spec.pop('useragent')227        if 'viewport' in spec:228            context_opts['viewport'] = spec.pop('viewport')229        context = await browser.new_context(**context_opts)230        page = await context.new_page()...

cli.py

Source:cli.py

...313        }314        if output != "-":315            kwargs["path"] = output316        if media_screen:317            page.emulate_media(media="screen")318        pdf = page.pdf(**kwargs)319        if output == "-":320            sys.stdout.buffer.write(pdf)321        else:322            click.echo(323                "Screenshot of '{}' written to '{}'".format(url, output), err=True324            )325        browser.close()326@cli.command()327def install():328    """329    Install Playwright browser needed by this tool.330    Usage:331        shot-scraper install...

main.py

Source:main.py

1import os2import sys3import shutil4import argparse5from bowler import Query6methods = [7    ("addInitScript", "add_init_script"),8    ("addScriptTag", "add_script_tag"),9    ("addStyleTag", "add_style_tag"),10    ("bringToFront", "bring_to_front"),11    ("dispatchEvent", "dispatch_event"),12    ("emulateMedia", "emulate_media"),13    ("evalOnSelector", "eval_on_selector"),14    ("evalOnSelectorAll", "eval_on_selector_all"),15    ("evaluateHandle", "evaluate_handle"),16    ("expectDownload", "expect_download"),17    ("expectFileChooser", "expect_file_chooser"),18    ("exposeBinding", "expose_binding"),19    ("exposeFunction", "expose_function"),20    ("newPage", "new_page"),21    ("newContext", "new_context"),22    ("innerHTML", "inner_html"),23    ("innerText", "inner_text"),24    ("setContent", "set_content"),25    ("setDefaultNavigationTimeout", "set_default_navigation_timeout"),26    ("setDefaultTimeout", "set_default_timeout"),27    ("setExtraHTTPHeaders", "set_extra_http_headers"),28    ("setInputFiles", "set_input_files"),29    ("setViewportSize", "set_viewport_size"),30    ("textContent", "text_content"),31    ("viewportSize", "viewport_size"),32    ("waitForEvent", "wait_for_event"),33    ("waitForFunction","wait_for_function"),34    ("waitForLoadState", "wait_for_load_state"),35    ("waitForSelector", "wait_for_selector"),36    ("querySelector", "query_selector"),37    ("querySelectorAll", "query_selector_all"),38    ("waitForTimeout","wait_for_timeout"),39]40class RefactorTool:41    def __init__(self, input, nobackups, show_diffs):42        """43        Args:44            input: path to file to be refactored.45            nobackups: If true no backup '.bak' files will be created for those46                files that are being refactored.47            show_diffs: Should diffs of the refactoring be printed to stdout?48        """49        self.nobackups = nobackups50        self.show_diffs = show_diffs51        self.fn = input52        self.query = Query([self.fn])53    def rename_methods(self):54        for old_name, new_name in methods:55            self.query.select_method(old_name).rename(new_name)56    def fix_imports(self):57        # Fix old style: from playwright import sync_playwright58        self.query.select_module("sync_playwright").select_module("playwright").rename(59            "playwright.sync_api"60        )61        pass62    def output_diffs(self):63        self.query.diff()64    def write_file(self):65        if not self.nobackups:66            # Make a backup before refactor67            backup = self.fn + ".bak"68            if os.path.lexists(backup):69                try:70                    os.remove(backup)71                except OSError as err:72                    self.log_message("Cannot remove backup %s" % backup)73            try:74                shutil.copyfile(self.fn, backup)75            except OSError as err:76                self.log_message("Cannot copy %s to %s" % (self.fn, backup))77        self.query.write()78    def log_message(self, msg):79        print("Info: " + msg)80    def log_error(self, msg):81        print("Error: " + msg)82def main(args=sys.argv[1:]):83    """Main program.84    Args:85        args: optional; a list of command line arguments. If omitted,86              sys.argv[1:] is used.87    """88    # Set up arg parser89    parser = argparse.ArgumentParser(description="Migrate playwright code to 1.8+")90    parser.add_argument(91        "--no-diffs",92        action="store_true",93        default=False,94        help="Don't show diffs of the refactoring",95    )96    parser.add_argument(97        "-n",98        "--nobackups",99        action="store_true",100        default=False,101        help="Don't write backups for modified files",102    )103    parser.add_argument(104        "-w",105        "--write",106        action="store_true",107        default=False,108        help="Write back modified files",109    )110    parser.add_argument("path", metavar="path", type=str, help="the path to the file")111    args = parser.parse_args()112    fix = RefactorTool(args.path, nobackups=False, show_diffs=(not args.no_diffs))113    fix.fix_imports()114    fix.rename_methods()115    if not args.no_diffs:116        fix.output_diffs()117    if args.write:118        fix.write_file()119if __name__ == "__main__":...

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.