Surface exceptions from workers to testing frameworks.

CHANGELOG.md

@@ -12,7 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Fixed a crash in `TextArea` when undoing an edit to a selection the selection was made backwards https://github.com/Textualize/textual/issues/4301
 - Fixed issue with flickering scrollbars https://github.com/Textualize/textual/pull/4315
 - Fix progress bar ETA not updating when setting `total` reactive https://github.com/Textualize/textual/pull/4316
-- Exceptions inside `Widget.compose` weren't bubbling up in tests https://github.com/Textualize/textual/issues/4282
+- Exceptions inside `Widget.compose` or workers weren't bubbling up in tests https://github.com/Textualize/textual/issues/4282
 
 ### Changed 
 

src/textual/worker.py

@@ -375,7 +375,7 @@ async def _run(self, app: App) -> None:
 
             app.log.worker(Traceback())
             if self.exit_on_error:
-                app._fatal_error()
+                app._handle_exception(error)
         else:
             self.state = WorkerState.SUCCESS
             app.log.worker(self)

tests/test_pilot.py

@@ -2,7 +2,7 @@
 
 import pytest
 
-from textual import events
+from textual import events, work
 from textual.app import App, ComposeResult
 from textual.binding import Binding
 from textual.containers import Center, Middle
@@ -71,7 +71,7 @@ def compose(self) -> ComposeResult:
             pass
 
 
-async def test_pilot_exception_cathing_widget_compose():
+async def test_pilot_exception_catching_widget_compose():
     class SomeScreen(Screen[None]):
         def compose(self) -> ComposeResult:
             1 / 0
@@ -101,6 +101,20 @@ def action_beep(self) -> None:
             await pilot.press("b")
 
 
+async def test_pilot_exception_catching_worker():
+    class SimpleAppThatCrashes(App[None]):
+        def on_mount(self) -> None:
+            self.crash()
+
+        @work(name="crash")
+        async def crash(self) -> None:
+            1 / 0
+
+    with pytest.raises(ZeroDivisionError):
+        async with SimpleAppThatCrashes().run_test():
+            pass
+
+
 async def test_pilot_click_screen():
     """Regression test for https://github.com/Textualize/textual/issues/3395.