def test_deselect_notesxisting():
application_control.selected_channels = []
with pytest.raises(application_control.Channel_name_Error):
application_control.deselect("FaceBook")
def test_deselect():
selected_channels = ["Twitter", "Facebook", "Mail"]
application_control.selected_channels = ["Twitter", "Facebook", "Mail"]
application_control.deselect("Mail")
selected_channels.remove("Mail")
assert application_control.selected_channels == selected_channels
