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import sys
import pytest
from textual.app import App, SuspendNotSupported
from textual.drivers.headless_driver import HeadlessDriver
async def test_suspend_not_supported() -> None:
"""Suspending when not supported should raise an error."""
async with App().run_test() as pilot:
# Pilot uses the headless driver, the headless driver doesn't
# support suspend, and so...
with pytest.raises(SuspendNotSupported):
with pilot.app.suspend():
pass
async def test_suspend_supported(capfd: pytest.CaptureFixture[str]) -> None:
"""Suspending when supported should call the relevant driver methods."""
calls: set[str] = set()
class HeadlessSuspendDriver(HeadlessDriver):
@property
def is_headless(self) -> bool:
return False
@property
def can_suspend(self) -> bool:
return True
def suspend_application_mode(self) -> None:
nonlocal calls
calls.add("suspend")
def resume_application_mode(self) -> None:
nonlocal calls
calls.add("resume")
class SuspendApp(App[None]):
def on_suspend(self, _) -> None:
nonlocal calls
calls.add("suspend signal")
def on_resume(self, _) -> None:
nonlocal calls
calls.add("resume signal")
def on_mount(self) -> None:
self.app_suspend_signal.subscribe(self, self.on_suspend, immediate=True)
self.app_resume_signal.subscribe(self, self.on_resume, immediate=True)
async with SuspendApp(driver_class=HeadlessSuspendDriver).run_test(
headless=False
) as pilot:
calls = set()
with pilot.app.suspend():
_ = capfd.readouterr() # Clear the existing buffer.
print("USE THEM TOGETHER.", end="", flush=True)
print("USE THEM IN PEACE.", file=sys.stderr, end="", flush=True)
assert ("USE THEM TOGETHER.", "USE THEM IN PEACE.") == capfd.readouterr()
assert calls == {"suspend", "resume", "suspend signal", "resume signal"}
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