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import asyncio
import gc
import pytest
from textual.app import App, ComposeResult
from textual.containers import Vertical
from textual.widgets import Footer, Header, Label
def count_nodes() -> int:
"""Count number of references to DOMNodes."""
dom_nodes = [
obj
for obj in gc.get_objects()
if any(cls.__name__ == "DOMNode" for cls in obj.__class__.__mro__)
]
print(dom_nodes)
return len(dom_nodes)
async def run_app() -> None:
"""Run a dummy app."""
class DummyApp(App):
"""Dummy app with a few widgets."""
def compose(self) -> ComposeResult:
yield Header()
with Vertical():
yield Label("foo")
yield Label("bar")
yield Footer()
app = DummyApp()
async with app.run_test() as pilot:
# We should have a bunch of DOMNodes while the test is running
assert count_nodes() > 0
await pilot.press("ctrl+c")
assert not app._running
# Force a GC collection
gc.collect()
# After the test, all DOMNodes will have been torn down
assert count_nodes() == 1
async def _count_app_nodes() -> None:
"""Regression test for https://github.com/Textualize/textual/issues/4959"""
# Should be no DOMNodes yet
assert count_nodes() == 0
await run_app()
await asyncio.sleep(0)
gc.collect()
nodes_remaining = count_nodes()
if nodes_remaining:
print("NODES REMAINING")
import objgraph
objgraph.show_backrefs(
[
obj
for obj in gc.get_objects()
if any(cls.__name__ == "App" for cls in obj.__class__.__mro__)
],
filename="graph.png",
max_depth=15,
)
assert nodes_remaining == 0
# It looks like PyTest holds on to references to DOMNodes
# So this will only pass if ran in isolation
@pytest.mark.xfail
async def test_gc():
"""Regression test for https://github.com/Textualize/textual/issues/4959"""
await _count_app_nodes()
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