def test_FileManager_ls_fail():
"""
The on_list_fail signal is emitted when a problem is encountered.
"""
fm = FileManager("/dev/ttyUSB0")
fm.on_list_fail = mock.MagicMock()
with mock.patch('mu.modes.base.microfs.ls', side_effect=Exception('boom')):
fm.ls()
fm.on_list_fail.emit.assert_called_once_with()
def test_FileManager_ls():
"""
The on_list_files signal is emitted with a tuple of files when microfs.ls
completes successfully.
"""
fm = FileManager("/dev/ttyUSB0")
fm.serial = mock.MagicMock()
fm.on_list_files = mock.MagicMock()
mock_ls = mock.MagicMock(return_value=["foo.py", "bar.py"])
with mock.patch("mu.modes.base.microfs.ls", mock_ls):
fm.ls()
fm.on_list_files.emit.assert_called_once_with(("foo.py", "bar.py"))
def test_FileManager_on_start():
"""
When a thread signals it has started, create a serial connection and then
list the files.
"""
fm = FileManager("/dev/ttyUSB0")
fm.ls = mock.MagicMock()
with mock.patch('mu.modes.base.Serial') as mock_serial:
fm.on_start()
mock_serial.assert_called_once_with("/dev/ttyUSB0",
115200,
timeout=1,
parity='N')
fm.ls.assert_called_once_with()