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import os
from pathlib import Path
from textual.file_monitor import FileMonitor
def test_repr() -> None:
file_monitor = FileMonitor([Path(".")], lambda: None)
assert "FileMonitor" in repr(file_monitor)
def test_file_never_found():
path = "doesnt_exist.tcss"
file_monitor = FileMonitor([Path(path)], lambda: None)
file_monitor.check() # Ensuring no exceptions are raised.
async def test_file_deletion(tmp_path):
"""In some environments, a file can become temporarily unavailable during saving.
This test ensures the FileMonitor is robust enough to handle a file temporarily being
unavailable, and that it recovers when the file becomes available again.
Regression test for: https://github.com/Textualize/textual/issues/3996
"""
def make_file():
path = tmp_path / "will_be_deleted.tcss"
path.write_text("#foo { color: dodgerblue; }")
return path
callback_counter = 0
def callback():
nonlocal callback_counter
callback_counter += 1
path = make_file()
file_monitor = FileMonitor([path], callback)
# Ensure the file monitor survives after the file is gone
await file_monitor()
os.remove(path)
# The file is now unavailable, but we don't crash here
await file_monitor()
await file_monitor()
# Despite multiple checks, the file was only available for the first check,
# and we only fire the callback while the file is available.
assert callback_counter == 1
# The file is made available again.
make_file()
# Since the file is available, the callback should fire when the FileMonitor is called
await file_monitor()
assert callback_counter == 2
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