pytest 如何测试函数中抛出的异常

一般Python中异常可以用 raise 来抛出，此时单测中想要测试错误用例是否触发异常了，可以用pytest中的 with pytest.raises(xxx) 如下：

import pytest
import unittest


class Info(object):
    """info class"""

    def __init__(self, name):
        """
        初始化
        Args:
            name (str): 用户名称
        """
        if name == "":
            raise Exception("name is empty")
        self.name = name


class TestInfo(unittest.TestCase):
	"""
    Testcase for Info
    """
    def test_init(self):
    	some_value = ""
        # 判断是否raise了一个Exception
        with pytest.raises(Exception):
            one = Info("")
        expected = ""
        assert some_value == expected