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

How to use expose_binding method in Playwright Python

Best Python code snippet using playwright-python

test_page.py

Source:test_page.py

...229            }"""230        )231    response = await response_info.value232    assert response.url == server.PREFIX + "/digits/2.png"233async def test_expose_binding(page):234    binding_source = []235    def binding(source, a, b):236        binding_source.append(source)237        return a + b238    await page.expose_binding("add", lambda source, a, b: binding(source, a, b))239    result = await page.evaluate("add(5, 6)")240    assert binding_source[0]["context"] == page.context241    assert binding_source[0]["page"] == page242    assert binding_source[0]["frame"] == page.main_frame243    assert result == 11244async def test_expose_function(page, server):245    await page.expose_function("compute", lambda a, b: a * b)246    result = await page.evaluate("compute(9, 4)")247    assert result == 36248@pytest.mark.skip("todo mxschmitt")249async def test_expose_function_should_throw_exception_in_page_context(page, server):250    def throw():251        raise Exception("WOOF WOOF")252    await page.expose_function("woof", lambda: throw())253    result = await page.evaluate(254        """async() => {255            try {256                await woof()257            } catch (e) {258                return {message: e.message, stack: e.stack}259            }260        }"""261    )262    assert result["message"] == "WOOF WOOF"263    assert __file__ in result["stack"]264async def test_expose_function_should_be_callable_from_inside_add_init_script(page):265    called = []266    await page.expose_function("woof", lambda: called.append(True))267    await page.add_init_script("woof()")268    await page.reload()269    assert called == [True]270async def test_expose_function_should_survive_navigation(page, server):271    await page.expose_function("compute", lambda a, b: a * b)272    await page.goto(server.EMPTY_PAGE)273    result = await page.evaluate("compute(9, 4)")274    assert result == 36275async def test_expose_function_should_await_returned_promise(page):276    async def mul(a, b):277        return a * b278    await page.expose_function("compute", mul)279    assert await page.evaluate("compute(3, 5)") == 15280async def test_expose_function_should_work_on_frames(page, server):281    await page.expose_function("compute", lambda a, b: a * b)282    await page.goto(server.PREFIX + "/frames/nested-frames.html")283    frame = page.frames[1]284    assert await frame.evaluate("compute(3, 5)") == 15285async def test_expose_function_should_work_on_frames_before_navigation(page, server):286    await page.goto(server.PREFIX + "/frames/nested-frames.html")287    await page.expose_function("compute", lambda a, b: a * b)288    frame = page.frames[1]289    assert await frame.evaluate("compute(3, 5)") == 15290async def test_expose_function_should_work_after_cross_origin_navigation(page, server):291    await page.goto(server.EMPTY_PAGE)292    await page.expose_function("compute", lambda a, b: a * b)293    await page.goto(server.CROSS_PROCESS_PREFIX + "/empty.html")294    assert await page.evaluate("compute(9, 4)") == 36295async def test_expose_function_should_work_with_complex_objects(page, server):296    await page.expose_function("complexObject", lambda a, b: dict(x=a["x"] + b["x"]))297    result = await page.evaluate("complexObject({x: 5}, {x: 2})")298    assert result["x"] == 7299async def test_expose_bindinghandle_should_work(page, server):300    targets = []301    def logme(t):302        targets.append(t)303        return 17304    await page.expose_binding("logme", lambda source, t: logme(t), handle=True)305    result = await page.evaluate("logme({ foo: 42 })")306    assert (await targets[0].evaluate("x => x.foo")) == 42307    assert result == 17308async def test_page_error_should_fire(page, server, is_webkit):309    async with page.expect_event("pageerror") as error_info:310        await page.goto(server.PREFIX + "/error.html")311    error = await error_info.value312    assert error.message == "Fancy error!"313    stack = await page.evaluate("window.e.stack")314    # Note that WebKit reports the stack of the 'throw' statement instead of the Error constructor call.315    if is_webkit:316        stack = stack.replace("14:25", "15:19")317    assert error.stack == stack318async def test_page_error_should_handle_odd_values(page, is_firefox):...

_page.py

Source:_page.py

...367        self, url: str = None, path: Union[str, Path] = None, content: str = None368    ) -> ElementHandle:369        return await self._main_frame.add_style_tag(**locals_to_params(locals()))370    async def expose_function(self, name: str, callback: Callable) -> None:371        await self.expose_binding(name, lambda source, *args: callback(*args))372    async def expose_binding(373        self, name: str, callback: Callable, handle: bool = None374    ) -> None:375        if name in self._bindings:376            raise Error(f'Function "{name}" has been already registered')377        if name in self._browser_context._bindings:378            raise Error(379                f'Function "{name}" has been already registered in the browser context'380            )381        self._bindings[name] = callback382        await self._channel.send(383            "exposeBinding", dict(name=name, needsHandle=handle or False)384        )385    async def set_extra_http_headers(self, headers: Dict[str, str]) -> None:386        await self._channel.send(...

test_browsercontext.py

Source:test_browsercontext.py

...279    binding_source = []280    def binding(source, a, b):281        binding_source.append(source)282        return a + b283    await context.expose_binding("add", lambda source, a, b: binding(source, a, b))284    page = await context.new_page()285    result = await page.evaluate("add(5, 6)")286    assert binding_source[0]["context"] == context287    assert binding_source[0]["page"] == page288    assert binding_source[0]["frame"] == page.main_frame289    assert result == 11290async def test_expose_function_should_work(context):291    await context.expose_function("add", lambda a, b: a + b)292    page = await context.new_page()293    await page.expose_function("mul", lambda a, b: a * b)294    await context.expose_function("sub", lambda a, b: a - b)295    result = await page.evaluate(296        """async function() {297      return { mul: await mul(9, 4), add: await add(9, 4), sub: await sub(9, 4) }298    }"""299    )300    assert result == {"mul": 36, "add": 13, "sub": 5}301async def test_expose_function_should_throw_for_duplicate_registrations(302    context, server303):304    await context.expose_function("foo", lambda: None)305    await context.expose_function("bar", lambda: None)306    with pytest.raises(Error) as exc_info:307        await context.expose_function("foo", lambda: None)308    assert exc_info.value.message == 'Function "foo" has been already registered'309    page = await context.new_page()310    with pytest.raises(Error) as exc_info:311        await page.expose_function("foo", lambda: None)312    assert (313        exc_info.value.message314        == 'Function "foo" has been already registered in the browser context'315    )316    await page.expose_function("baz", lambda: None)317    with pytest.raises(Error) as exc_info:318        await context.expose_function("baz", lambda: None)319    assert (320        exc_info.value.message321        == 'Function "baz" has been already registered in one of the pages'322    )323async def test_expose_function_should_be_callable_from_inside_add_init_script(324    context, server325):326    args = []327    await context.expose_function("woof", lambda arg: args.append(arg))328    await context.add_init_script("woof('context')")329    page = await context.new_page()330    await page.add_init_script("woof('page')")331    args = []332    await page.reload()333    assert args == ["context", "page"]334async def test_expose_bindinghandle_should_work(context):335    targets = []336    def logme(t):337        targets.append(t)338        return 17339    page = await context.new_page()340    await page.expose_binding("logme", lambda source, t: logme(t), handle=True)341    result = await page.evaluate("logme({ foo: 42 })")342    assert (await targets[0].evaluate("x => x.foo")) == 42343    assert result == 17344async def test_route_should_intercept(context, server):345    intercepted = []346    def handle(route, request):347        intercepted.append(True)348        assert "empty.html" in request.url349        assert request.headers["user-agent"]350        assert request.method == "GET"351        assert request.post_data is None352        assert request.is_navigation_request353        assert request.resource_type == "document"354        assert request.frame == page.main_frame...

_browser_context.py

Source:_browser_context.py

...133                script = file.read()134        if not isinstance(script, str):135            raise Error("Either path or source parameter must be specified")136        await self._channel.send("addInitScript", dict(source=script))137    async def expose_binding(138        self, name: str, callback: Callable, handle: bool = None139    ) -> None:140        for page in self._pages:141            if name in page._bindings:142                raise Error(143                    f'Function "{name}" has been already registered in one of the pages'144                )145        if name in self._bindings:146            raise Error(f'Function "{name}" has been already registered')147        self._bindings[name] = callback148        await self._channel.send(149            "exposeBinding", dict(name=name, needsHandle=handle or False)150        )151    async def expose_function(self, name: str, callback: Callable) -> None:152        await self.expose_binding(name, lambda source, *args: callback(*args))153    async def route(self, url: URLMatch, handler: RouteHandler) -> None:154        self._routes.append(RouteHandlerEntry(URLMatcher(url), handler))155        if len(self._routes) == 1:156            await self._channel.send(157                "setNetworkInterceptionEnabled", dict(enabled=True)158            )159    async def unroute(160        self, url: URLMatch, handler: Optional[RouteHandler] = None161    ) -> None:162        self._routes = list(163            filter(164                lambda r: r.matcher.match != url or (handler and r.handler != handler),165                self._routes,166            )...

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.