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"""Regression test for https://github.com/Textualize/textual/issues/2914
Make sure that calls to render only happen after a widget being mounted.
"""
import asyncio
from textual.app import App
from textual.widget import Widget
class W(Widget):
def render(self):
return self.renderable
async def on_mount(self):
await asyncio.sleep(0.1)
self.renderable = "1234"
async def test_render_only_after_mount():
"""Regression test for https://github.com/Textualize/textual/issues/2914"""
app = App()
async with app.run_test() as pilot:
app.mount(W())
app.mount(W())
await pilot.pause()
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