How to use stop_tracing method in Playwright Python

Best Python code snippet using playwright-python

kvm_flightrecorder

Source:kvm_flightrecorder

...44    write_file(trace_path('events', subsystem, 'enable'), '1' if enable else '0')45def start_tracing():46    enable_subsystem('kvm', True)47    write_file(trace_path('tracing_on'), '1')48def stop_tracing():49    write_file(trace_path('tracing_on'), '0')50    enable_subsystem('kvm', False)51    write_file(trace_path('events', 'enable'), '0')52    write_file(trace_path('current_tracer'), 'nop')53def dump_trace():54    tracefile = open(trace_path('trace'), 'r')55    try:56        lines = True57        while lines:58            lines = tracefile.readlines(64 * 1024)59            sys.stdout.writelines(lines)60    except KeyboardInterrupt:61        pass62def tail_trace():63    try:64        for line in open(trace_path('trace_pipe'), 'r'):65            sys.stdout.write(line)66    except KeyboardInterrupt:67        pass68def usage():69    print 'Usage: %s start [buffer_size_kb] | stop | dump | tail' % sys.argv[0]70    print 'Control the KVM flight recorder tracing.'71    sys.exit(0)72def main():73    if len(sys.argv) < 2:74        usage()75    cmd = sys.argv[1]76    if cmd == '--version':77        print 'kvm_flightrecorder version 1.0'78        sys.exit(0)79    if not os.path.isdir(tracing_dir):80        print 'Unable to tracing debugfs directory, try:'81        print 'mount -t debugfs none /sys/kernel/debug'82        sys.exit(1)83    if not os.access(tracing_dir, os.W_OK):84        print 'Unable to write to tracing debugfs directory, please run as root'85        sys.exit(1)86    if cmd == 'start':87        stop_tracing() # clean up first88        if len(sys.argv) == 3:89            try:90                buffer_size_kb = int(sys.argv[2])91            except ValueError:92                print 'Invalid per-cpu trace buffer size in KB'93                sys.exit(1)94            write_file(trace_path('buffer_size_kb'), str(buffer_size_kb))95            print 'Per-CPU ring buffer size set to %d KB' % buffer_size_kb96        start_tracing()97        print 'KVM flight recorder enabled'98    elif cmd == 'stop':99        stop_tracing()100        print 'KVM flight recorder disabled'101    elif cmd == 'dump':102        dump_trace()103    elif cmd == 'tail':104        tail_trace()105    else:106        usage()107if __name__ == '__main__':...

test_chromium_tracing.py

Source:test_chromium_tracing.py

...22):23    output_file = tmpdir / "trace.json"24    await browser.start_tracing(page=page, screenshots=True, path=output_file)25    await page.goto(server.PREFIX + "/grid.html")26    await browser.stop_tracing()27    assert os.path.getsize(output_file) > 028@pytest.mark.only_browser("chromium")29async def test_should_create_directories_as_needed(30    browser: Browser, page: Page, server, tmpdir31):32    output_file = tmpdir / "these" / "are" / "directories" / "trace.json"33    await browser.start_tracing(page=page, screenshots=True, path=output_file)34    await page.goto(server.PREFIX + "/grid.html")35    await browser.stop_tracing()36    assert os.path.getsize(output_file) > 037@pytest.mark.only_browser("chromium")38async def test_should_run_with_custom_categories_if_provided(39    browser: Browser, page: Page, tmpdir: Path40):41    output_file = tmpdir / "trace.json"42    await browser.start_tracing(43        page=page,44        screenshots=True,45        path=output_file,46        categories=["disabled-by-default-v8.cpu_profiler.hires"],47    )48    await browser.stop_tracing()49    with open(output_file, mode="r") as of:50        trace_json = json.load(of)51        assert (52            "disabled-by-default-v8.cpu_profiler.hires"53            in trace_json["metadata"]["trace-config"]54        )55@pytest.mark.only_browser("chromium")56async def test_should_throw_if_tracing_on_two_pages(57    browser: Browser, page: Page, tmpdir: Path58):59    output_file_1 = tmpdir / "trace1.json"60    await browser.start_tracing(page=page, screenshots=True, path=output_file_1)61    output_file_2 = tmpdir / "trace2.json"62    with pytest.raises(Exception):63        await browser.start_tracing(page=page, screenshots=True, path=output_file_2)64    await browser.stop_tracing()65@pytest.mark.only_browser("chromium")66async def test_should_return_a_buffer(67    browser: Browser, page: Page, server, tmpdir: Path68):69    output_file = tmpdir / "trace.json"70    await browser.start_tracing(page=page, path=output_file, screenshots=True)71    await page.goto(server.PREFIX + "/grid.html")72    value = await browser.stop_tracing()73    with open(output_file, mode="r") as trace_file:74        assert trace_file.read() == value.decode()75@pytest.mark.only_browser("chromium")76async def test_should_work_without_options(browser: Browser, page: Page, server):77    await browser.start_tracing()78    await page.goto(server.PREFIX + "/grid.html")79    trace = await browser.stop_tracing()80    assert trace81@pytest.mark.only_browser("chromium")82async def test_should_support_a_buffer_without_a_path(83    browser: Browser, page: Page, server84):85    await browser.start_tracing(page=page, screenshots=True)86    await page.goto(server.PREFIX + "/grid.html")87    trace = await browser.stop_tracing()...

tests.py

Source:tests.py

...21        # on the output of read().22        content = 'A file.'23        project.start_tracing()24        self.assertEqual(render('text.txt'), 'A file.')25        trace = project.stop_tracing()26        self.assertEqual(trace.splitlines(), [27            "calling render('text.txt')",28            ". calling read('text.txt')",29        ])30        # Second check: with more interesting content, render() will31        # also call hash().32        content = 'My hash is $HASH.'33        print(project._cache)34        t = Task(read, ('text.txt',))35        print(t)36        print(t in project._cache)37        project.invalidate(t)38        project.start_tracing()39        project.rebuild()40        trace = project.stop_tracing()41        self.assertEqual(render('text.txt'), 'My hash is 28.')42        self.assertEqual(trace.splitlines(), [43            "calling read('text.txt')",44            "calling render('text.txt')",45            ". calling hash_of('text.txt')",46        ])47        # Final check: if we then remove the interesting content, does48        # Contingent recognize the hash no longer needs to be computed?49        content = 'Simple file again.'50        print(project._cache)51        t = Task(read, ('text.txt',))52        print(t)53        print(t in project._cache)54        project.invalidate(t)55        project.start_tracing()56        project.rebuild()57        trace = project.stop_tracing()58        self.assertEqual(render('text.txt'), 'Simple file again.')59        self.assertEqual(trace.splitlines(), [60            "calling read('text.txt')",61            "calling render('text.txt')",...

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.