def test_process_step_only_starts_current_note_when_previous_note_is_empty(
self, mock_send_message, mock_get_previous_step):
mock_get_previous_step.return_value = Note(None, is_hold=False)
sequencer = Sequencer(0, 1, 4, 4)
sequencer.set_midi_channel(0)
sequencer.process_step(Note(1, is_hold=False))
self.assertEquals(mock_send_message.call_count, 1)
self.assertEquals(mock_send_message.call_args[0], ('NoteOn', 0, 1))
def test_process_steps_stops_previous_note_when_previous_note_is_hold_and_current_note_is_empty(
self, mock_send_message, mock_get_previous_step):
mock_get_previous_step.return_value = Note(99, is_hold=True)
sequencer = Sequencer(0, 1, 4, 4)
sequencer.set_midi_channel(0)
sequencer.process_step(Note(None, is_hold=False))
self.assertEquals(mock_send_message.call_count, 1)
self.assertEquals(mock_send_message.call_args_list[0][0],
('NoteOff', 0, 99))
