按最新版的pytest测试框架。
如果只是单一的mark，不要加任何引号。
如果是要作and ,not之类的先把，一定要是双引号！
这个要记清楚，好像和以前版本的书上介绍的不一样，切记！
import pytest
import tasks
@pytest.mark.smoke
def test_list_raises():
with pytest.raises(TypeError):
tasks.list_tasks(owner=123)
@pytest.mark.get
@pytest.mark.smoke
def test_get_raises():
with pytest.raises(TypeError):
tasks.get(task_id=')
def test_add_raises():
with pytest.raises(TypeError):
tasks.add(task="not a task object")
def test_start_db_raises():
with pytest.raises(ValueError) as excinfo:
tasks.start_tasks_db('some/great/path', 'mysql')
exception_msg = excinfo.value.args[0]
assert exception_msg == "db_type must be a 'tiny' or 'mongo'"