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* Managing exceptions when watched CSS files are unavailable * Handling scenario where FileMonitor crashes when file temporarily becomes unavailable. * Update CHANGELOG * Update log level to warning
87 lines
2.3 KiB
Python
87 lines
2.3 KiB
Python
import os
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from pathlib import Path
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from textual.app import App, ComposeResult
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from textual.screen import Screen
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from textual.widgets import Label
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CSS_PATH = (Path(__file__) / "../css_reloading.tcss").resolve()
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class BaseScreen(Screen[None]):
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def compose(self) -> ComposeResult:
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yield Label("I am the base screen")
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class TopScreen(Screen[None]):
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DEFAULT_CSS = """
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TopScreen {
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opacity: 1;
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background: green 0%;
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}
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"""
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class MyApp(App[None]):
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CSS_PATH = CSS_PATH
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def on_mount(self) -> None:
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self.push_screen(BaseScreen())
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self.push_screen(TopScreen())
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async def test_css_reloading_applies_to_non_top_screen(monkeypatch) -> None: # type: ignore
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"""Regression test for https://github.com/Textualize/textual/issues/3931"""
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monkeypatch.setenv(
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"TEXTUAL", "debug"
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) # This will make sure we create a file monitor.
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# Write some initial CSS.
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Path(CSS_PATH).write_text(
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"""\
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Label {
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height: 5;
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border: panel white;
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}
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"""
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)
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app = MyApp()
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async with app.run_test() as pilot:
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await pilot.pause()
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first_label = pilot.app.screen_stack[-2].query(Label).first()
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# Sanity check.
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assert first_label.styles.height is not None
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assert first_label.styles.height.value == 5
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# Clear the CSS from the file.
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Path(CSS_PATH).write_text("/* This file has no rules intentionally. */\n")
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await pilot.pause()
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await pilot.app._on_css_change()
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# Height should fall back to 1.
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assert first_label.styles.height is not None
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assert first_label.styles.height.value == 1
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async def test_css_reloading_file_not_found(monkeypatch, tmp_path):
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"""Regression test for https://github.com/Textualize/textual/issues/3996
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Files can become temporarily unavailable during saving on certain environments.
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"""
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monkeypatch.setenv("TEXTUAL", "debug")
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css_path = tmp_path / "test_css_reloading_file_not_found.tcss"
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with open(css_path, "w") as css_file:
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css_file.write("#a {color: red;}")
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class TextualApp(App):
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CSS_PATH = css_path
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app = TextualApp()
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async with app.run_test() as pilot:
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await pilot.app._on_css_change()
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os.remove(css_path)
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assert not css_path.exists()
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await pilot.app._on_css_change()
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