Textual hangs instead of exiting after raising StylesheetError if run headless

[tconbeer]

This program will not exit if foo.tcss does not exist:

import asyncio
from textual.app import App

class MyApp(App):
    CSS_PATH = "foo.tcss"

async def my_test():
    app = MyApp()
    async with app.run_test() as pilot:
        pilot.press("enter")

asyncio.run(my_test())

We see the StyleSheetError printed to the console, but the app then continues (or hangs).

In pytest, this test will simply hang, and not fail if the stylesheet doesn't exist:

import asyncio
from textual.app import App

@pytest.mark.asyncio
def test_cannot_find_stylesheet():
    class MyApp(App):
        CSS_PATH = "foo.tcss"
    app = MyApp()
    async with app.run_test() as pilot:
        pilot.press("enter")

In contrast, this raises and exits:

from textual.app import App

class MyApp(App):
    CSS_PATH = "foo.tcss"

app = MyApp()
app.run()

Textual Diagnostics

Versions

Name	Value
Textual	0.36.0
Rich	13.5.2

Python

Name	Value
Version	3.8.10
Implementation	CPython
Compiler	GCC 9.3.0
Executable	/home/tco/.cache/pypoetry/virtualenvs/textual-stylesheet-repro-Y33mgdBe-py3.8/bin/python

Operating System

Name	Value
System	Linux
Release	5.10.60.1-microsoft-standard-WSL2
Version	#1 SMP Wed Aug 25 23:20:18 UTC 2021

Terminal

Name	Value
Terminal Application	Windows Terminal
TERM	xterm-256color
COLORTERM	Not set
FORCE_COLOR	Not set
NO_COLOR	Not set

Rich Console options

Name	Value
size	width=156, height=40
legacy_windows	False
min_width	1
max_width	156
is_terminal	True
encoding	utf-8
max_height	40
justify	None
overflow	None
no_wrap	False
highlight	None
markup	None
height	None

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