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How to use test_should_expose_function_from_browser_context method in Playwright Python

Best Python code snippet using playwright-python

test_popup.py

Source:test_popup.py

...201    popup = await popup_info.value202    assert await popup.evaluate("injected") == 123203    await popup.reload()204    assert await popup.evaluate("injected") == 123205async def test_should_expose_function_from_browser_context(context, server):206    await context.expose_function("add", lambda a, b: a + b)207    page = await context.new_page()208    await page.goto(server.EMPTY_PAGE)209    added = await page.evaluate(210        """async () => {211            win = window.open('about:blank')212            return win.add(9, 4)213        }"""214    )215    assert added == 13216async def test_should_work(context):217    page = await context.new_page()218    async with page.expect_popup() as popup_info:219        await page.evaluate('window.__popup = window.open("about:blank")')...

Playwright tutorial

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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.
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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.
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