How to run pytest.playwright tests on a dash app wtith multiple simulated users as load test (2024)

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Luggie : How to run pytest.playwright tests on a dash app wtith multiple simulated users as load test
I'd like to test my minimal dash app:

Code:

from dash import Dash, html, callbackfrom dash.dependencies import Input, Outputimport dash_bootstrap_components as dbcfrom time import sleepapp = Dash(__name__)app.layout = html.Div([ dbc.Button('Click me', id='button'), html.Div(id='output')])@callback( Output('output', 'children'), Input('button', 'n_clicks'))def click_and_sleep(n_clicks): sleep(1) return f'Button clicked {n_clicks} times'if __name__ == '__main__': app.run_server(debug=True, port=8000)

with this pytest.playwright test:

Code:

from playwright.sync_api import Page, expectdef test_app(page: Page): page.goto("http://localhost:8000/") page.wait_for_selector("#output") for n in range(3): page.click("#button") expect(page.locator("#output")).to_have_text(f"Button clicked {n+1} times")

Is there a way to use this setup so that it simulates multiple users simultaneously to load test my app?

/EDIT 1:

Based on the idea from @EricLavault I build a page factory, that outputs n users:

Code:

def page_factory( num_users: int,) -> list[Page]: pages = [] for _ in range(num_users): context = browser.new_context() page = context.new_page() pages.append(page) return pages

and a decorator that can be wrapped around the test functions to emulate n users:

Code:

def run_with_multiple_users(num_users: int) -> Callable: def decorator(test_func: Callable) -> Callable: @wraps(test_func) def wrapper*args, **kwargs): pages = page_factory(num_users) for page in pages: test_func(page, *args, **kwargs) page.close() return wrapper return decorator

when I run the test now with

Code:

@run_with_multiple_users(num_users=10)def test_app(...) ...

and pytest -k test_app -n 10 a browser is opened with 10 tabs, each serially making the test instead of all at once.

How can I run the page loop in parallel?

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