11-pytest-assert断言

Posted 2021-11-01 爱学习de测试小白

目录

前言

 断言passed

 断言failed

 断言error

 异常断言

 常用断言

---

前言

• 在做自动化测试中，怎么把实际结果和预期结果作比较呢，有个专业的术语叫做断言，符合预期的用例状态是pass，不符合预期用例状态是 failed

 断言passed

# -*- coding: utf-8 -*-
# @Time    : 2021/10/14
# @Author  : 大海
# @File    : test_20.py
import pytest


def four():
    return 4


def test_function():
    # 调用four方法返回4，与期望结果相同，结果为passed
    assert four() == 4


if __name__ == '__main__':
    pytest.main(["-s", "test_20.py"])

 断言failed

# -*- coding: utf-8 -*-
# @Time    : 2021/10/14
# @Author  : 大海
# @File    : test_21.py
import pytest


def four():
    return 4


def test_function():
    # 调用four方法返回4，与期望结果不同，结果为failed
    assert four() == 5


if __name__ == '__main__':
    pytest.main(["-s", "test_21.py"])

 断言error

# -*- coding: utf-8 -*-
# @Time    : 2021/10/14
# @Author  : 大海
# @File    : test_22.py

import pytest


@pytest.fixture()
def user():
    print("这是登录操作！")
    user = '小白'
    assert user == "小白兔"  # 1.在fixture中断言失败就是error
    return user


def test_1(user):
    assert user == "小白"


# 2.代码写的有问题也会error，此处未定义名为login的fixture，
def test_2(login):
    assert login == '小白'


if __name__ == "__main__":
    pytest.main(["-s", "test_22.py"])

 异常断言

# -*- coding: utf-8 -*-
# @Time    : 2021/10/14
# @Author  : 大海
# @File    : test_23.py

import pytest


def test_zero_division():
    """断言除0异常"""
    with pytest.raises(ZeroDivisionError) as e_info:
        1 / 0

    # 断言异常类型type
    # e_info 是一个异常信息实例，它是围绕实际引发的异常的包装器。主要属性是.type、 .value 和 .traceback
    print('value:', e_info.value)
    print('type:', e_info.type)
    print('traceback:', e_info.traceback)
    assert e_info.type == ZeroDivisionError
    # 断言异常value值
    assert "division by zero" in str(e_info.value)


if __name__ == '__main__':
    pytest.main(["-s", "test_23.py"])

 常用断言

• assert xx 判断xx为真
• assert not xx 判断xx不为真
• assert a in b 判断b包含a
• assert a not in b 判断b不包含a
• assert a == b 判断a等于b
• assert a != b 判断a不等于b

# -*- coding: utf-8 -*-
# @Time    : 2021/10/14
# @Author  : 大海
# @File    : test_24.py
import pytest


def is_true(age):
    if age == 18:
        return True
    else:
        return False


def test_01():
    a = 5
    b = -1
    assert is_true(a)  # 断言为真
    assert not is_true(b)  # 断言为假


def test_02():
    # 断言包含
    a = "hello"
    b = "hello world"
    assert a in b


def test_03():
    # 断言不包含
    a = '小白'
    b = "大海"
    assert a not in b


def test_04():
    # 断言相等
    a = "小白"
    b = "小白"
    assert a == b


def test_05():
    # 断言不等
    a = 5
    b = 6
    assert a != b


if __name__ == "__main__":
    pytest.main(["-s", "test_24.py"])