# 為測試結(jié)果作斷言
?
import pytest
from func import *
?
class TestFunc:
?def test_add_by_class(self):
? assert add(2,3) == 5

# 為斷言不通過的結(jié)果添加說明信息
?
def test_login():
? ? # 使用python內(nèi)置的斷言
?? ?# "1是不等于2的"是斷言失敗后，拋出異常輸出的自定義提示信息
? ? assert 1 == 2, "1是不等于2的"
? ??
test_login()
?
# 運行結(jié)果：
AssertionError: 1是不等于2的

# 變量存儲該異常的所有信息
with pytest.raises(TypeError) as 變量: 
    # 獲取變量的所有屬性，即type、value、traceback
    print(變量.__dict__)

import pytest
 
def test_zero_division_long():
    with pytest.raises(ZeroDivisionError) as excinfo:
        1 / 0
 
    # 斷言異常類型 type
    assert excinfo.type == ZeroDivisionError
    # 斷言異常 value 值
    assert "division by zero" in str(excinfo.value)

# 為預期異常作斷言完整示例，執(zhí)行用例為True
 
# ./func.py
def add(a,b):
    if isinstance(a,int) and isinstance(b,int):
        return a+b
    else:
        raise TypeError('數(shù)據(jù)類型錯誤')
 
# ./test_case/test_func.py
import pytest
from func import *
 
class TestFunc:
 
 # 正常測試用例
 def test_add_by_class(self):
    assert add(2,3) == 5
 
 # 異常測試用例，期望結(jié)果為拋出TypeError異常
 def test_add_by_func_aaa(self,*args, **kwargs):
    with pytest.raises(TypeError) as E:
        add('3',4)
    print(E.type)
    print(E.value)
    print(E.traceback)  
 
# ./run_test.py
import pytest
 
if __name__ == '__main__':
 pytest.main(['-v'])

# 木有拋出預期異常的示例，執(zhí)行用例為False
 
# ./func.py
def add(a,b):
 # 指定異常，從此處直接拋出異常
    raise NameError("名稱錯誤")
    if isinstance(a,int) and isinstance(b,int):
        return a+b
    else:
        raise TypeError('數(shù)據(jù)類型錯誤')
 
# ./test_case/test_func.py
import pytest
from func import *
 
class TestFunc:
    # 異常測試用例，期望結(jié)果為爆出TypeError異常
    def test_add_by_func_aaa(self,*args, **kwargs):
        with pytest.raises(TypeError):
            add('3',4)
  
# ./run_test.py
import pytest
 
if __name__ == '__main__':
 pytest.main(['-v'])

import pytest
 
def test_zero_division_long():
    with pytest.raises(ZeroDivisionError, match=".*zero.*") as excinfo:
        1 / 0
 
# match方法相當于re.search功能，即match="zero"也是允許的
def test_zero_division_long():
    with pytest.raises(ZeroDivisionError, match="zero") as excinfo:
        1 / 0

pytest.raises(ExpectedException, func, *args, **kwargs)

# ./func.py
def add(a,b):
    raise NameError('名字錯了')
    if isinstance(a,int) and isinstance(b,int):
        return a+b
    else:
        raise TypeError('數(shù)據(jù)類型錯誤')
 
# ./test_case/test_func.py
import pytest
from func import *
 
class TestFunc:
    # 異常測試用例，期望結(jié)果為爆出TypeError異常
    def test_add_by_func_aaa(self,*args, **kwargs):
    # 將預期中多個錯誤信息組成一個元組
        with pytest.raises((TypeError,NameError),match=r'.*錯.*$') as E:
            add('3',4)
 
 
# ./run_test.py
import pytest
 
if __name__ == '__main__':
 pytest.main(['-v'])

# 單個異常時斷言裝飾器使用
 
@pytest.mark.xfail(raises=ZeroDivisionError)
def test_f():
    1 / 0

# 多個異常時斷言裝飾器使用
@pytest.mark.xfail(raises=(TypeError, NameError))
def test_add_by_func_aaa2():
    add("3", 4)