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import asyncio
import pytest
from textual.app import App
from textual.worker import (
DeadlockError,
NoActiveWorker,
Worker,
WorkerCancelled,
WorkerError,
WorkerFailed,
WorkerState,
get_current_worker,
)
async def test_initialize():
"""Test initial values."""
def foo() -> str:
return "foo"
app = App()
async with app.run_test():
worker = Worker(app, foo, name="foo", group="foo-group", description="Foo test")
repr(worker)
assert worker.state == WorkerState.PENDING
assert not worker.is_cancelled
assert not worker.is_running
assert not worker.is_finished
assert worker.completed_steps == 0
assert worker.total_steps is None
assert worker.progress == 0.0
assert worker.result is None
async def test_run_success() -> None:
"""Test successful runs."""
def foo() -> str:
"""Regular function."""
return "foo"
async def bar() -> str:
"""Coroutine."""
return "bar"
async def baz() -> str:
"""Coroutine."""
return "baz"
class RunApp(App):
pass
app = RunApp()
async with app.run_test():
# Call regular function
foo_worker: Worker[str] = Worker(
app, foo, name="foo", group="foo-group", description="Foo test", thread=True
)
# Call coroutine function
bar_worker: Worker[str] = Worker(
app, bar, name="bar", group="bar-group", description="Bar test"
)
# Call coroutine
baz_worker: Worker[str] = Worker(
app, baz(), name="baz", group="baz-group", description="Baz test"
)
# Call coroutine function in a thread
bar_thread_worker: Worker[str] = Worker(
app, bar, name="bar", group="bar-group", description="Bar test", thread=True
)
# Call coroutine in a thread.
baz_thread_worker: Worker[str] = Worker(
app,
baz(),
name="baz",
group="baz-group",
description="Baz test",
thread=True,
)
assert foo_worker.result is None
assert bar_worker.result is None
assert baz_worker.result is None
assert bar_thread_worker.result is None
assert baz_thread_worker.result is None
foo_worker._start(app)
bar_worker._start(app)
baz_worker._start(app)
bar_thread_worker._start(app)
baz_thread_worker._start(app)
assert await foo_worker.wait() == "foo"
assert await bar_worker.wait() == "bar"
assert await baz_worker.wait() == "baz"
assert await bar_thread_worker.wait() == "bar"
assert await baz_thread_worker.wait() == "baz"
assert foo_worker.result == "foo"
assert bar_worker.result == "bar"
assert baz_worker.result == "baz"
assert bar_thread_worker.result == "bar"
assert baz_thread_worker.result == "baz"
async def test_run_error() -> None:
async def run_error() -> str:
await asyncio.sleep(0.1)
1 / 0
return "Never"
class ErrorApp(App):
pass
app = ErrorApp()
with pytest.raises(WorkerFailed):
async with app.run_test():
worker: Worker[str] = Worker(app, run_error)
worker._start(app)
await worker.wait()
async def test_run_cancel() -> None:
"""Test run may be cancelled."""
async def run_error() -> str:
await asyncio.sleep(0.1)
return "Never"
class ErrorApp(App):
pass
app = ErrorApp()
async with app.run_test():
worker: Worker[str] = Worker(app, run_error)
worker._start(app)
await asyncio.sleep(0)
worker.cancel()
assert worker.is_cancelled
with pytest.raises(WorkerCancelled):
await worker.wait()
async def test_run_cancel_immediately() -> None:
"""Edge case for cancelling immediately."""
async def run_error() -> str:
await asyncio.sleep(0.1)
return "Never"
class ErrorApp(App):
pass
app = ErrorApp()
async with app.run_test():
worker: Worker[str] = Worker(app, run_error)
worker._start(app)
worker.cancel()
assert worker.is_cancelled
with pytest.raises(WorkerCancelled):
await worker.wait()
async def test_get_worker() -> None:
"""Check get current worker."""
async def run_worker() -> Worker:
worker = get_current_worker()
return worker
class WorkerApp(App):
pass
app = WorkerApp()
async with app.run_test():
worker: Worker[Worker] = Worker(app, run_worker)
worker._start(app)
assert await worker.wait() is worker
def test_no_active_worker() -> None:
"""No active worker raises a specific exception."""
with pytest.raises(NoActiveWorker):
get_current_worker()
async def test_progress_update():
async def long_work():
pass
app = App()
async with app.run_test():
worker = Worker(app, long_work)
worker._start(app)
worker.update(total_steps=100)
assert worker.progress == 0
worker.advance(50)
assert worker.progress == 50
worker.update(completed_steps=23)
assert worker.progress == 73
async def test_double_start():
async def long_work():
return 0
app = App()
async with app.run_test():
worker = Worker(app, long_work)
worker._start(app)
worker._start(app)
assert await worker.wait() == 0
async def test_self_referential_deadlock():
async def self_referential_work():
await get_current_worker().wait()
app = App()
with pytest.raises(WorkerFailed) as exc:
async with app.run_test():
worker = Worker(app, self_referential_work)
worker._start(app)
await worker.wait()
assert exc.type is DeadlockError
async def test_wait_without_start():
async def work():
return
app = App()
async with app.run_test():
worker = Worker(app, work)
with pytest.raises(WorkerError):
await worker.wait()
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