def test_file_watch_os_error():
cb = MagicMock()
with make_file(b'test', 'csv') as fname:
fw = df.FileWatcher(fname, cb)
fw.check_for_changes()
assert cb.call_count == 0
def test_file_watch_os_error():
cb = MagicMock()
with make_file(b'test', 'csv') as fname:
fw = df.FileWatcher(fname, cb)
with pytest.warns(UserWarning, match='Cannot access'):
fw.check_for_changes()
assert cb.call_count == 0
def test_file_watch_os_error():
cb = MagicMock()
with make_file(b'test', 'csv') as fname:
fw = df.FileWatcher(fname, cb)
with warnings.catch_warnings(record=True) as w:
fw.check_for_changes()
assert len(w) == 1
assert str(w[0].message).startswith('Cannot access')
assert cb.call_count == 0
def test_file_watch():
cb = MagicMock()
with make_file(b'test', 'csv') as fname:
fw = df.FileWatcher(fname, cb)
fw.check_for_changes()
assert cb.call_count == 0
# fudge stat_cache to simulate filechange
# we could just change the file, but
# the underlying OS check has low time resolution
# and would require a sleep
fw.stat_cache -= 1
fw.check_for_changes()
assert cb.call_count == 1
