Python AssertionError:未引发ValueError
init类异常不会引发由assetRaises()标识的异常 当我为类单独创建一个实例时,定义的异常被正确地打印出来Python AssertionError:未引发ValueError,python,python-3.x,python-unittest,Python,Python 3.x,Python Unittest,init类异常不会引发由assetRaises()标识的异常 当我为类单独创建一个实例时,定义的异常被正确地打印出来 import unittest class Circle: def __init__(self, radius): # Define the initialization method below self.radius = radius try : if radius < 0 or radiu
import unittest
class Circle:
def __init__(self, radius):
# Define the initialization method below
self.radius = radius
try :
if radius < 0 or radius > 1000 : raise ValueError
except ValueError :
print("radius must be between 0 and 1000 inclusive")
class TestCircleCreation(unittest.TestCase):
def test_creating_circle_with_negative_radius(self):
# Try Defining a circle 'c' with radius -2.5 and see
# if it raises a ValueError with the message
# "radius must be between 0 and 1000 inclusive"
with self.assertRaises(ValueError) as e:
c = Circle(-2.5)
self.assertEqual(str(e.exception),"radius must be between 0 and 1000 inclusive")
assertRaises
仅测试上下文管理器中是否引发异常。您捕获异常,并且不重新访问它,因此unittest永远不会看到它
提出一个异常然后立即捕获它也没有什么意义。
相反,你应该:
class Circle:
def __init__(self, radius):
# Define the initialization method below
self.radius = radius
if radius < 0 or radius > 1000:
raise ValueError("radius must be between 0 and 1000 inclusive")
类圆:
定义初始(自身,半径):
#在下面定义初始化方法
自半径=半径
如果半径<0或半径>1000:
raise VALUE ERROR(“半径必须介于0和1000之间,包括0和1000之间”)
您正在捕获\uuuu init\uuuu
中的异常。您的测试断言异常是从\uuuu init\uuuu
抛出的,而不是在它内部捕获的。像这样:
def __init__(self, radius):
if radius < 0 or radius > 1000:
raise ValueError("radius must be between 0 and 1000 inclusive")
self.radius = radius
def\uuuu初始(自,半径):
如果半径<0或半径>1000:
raise VALUE ERROR(“半径必须介于0和1000之间,包括0和1000之间”)
自半径=半径
您正在捕获\uuuuu init\uuuu
中的异常。您的测试断言异常是从\uuuu init\uuuu
抛出的,而不是在它内部捕获的。那么如何在init外部抛出异常呢?
def __init__(self, radius):
if radius < 0 or radius > 1000:
raise ValueError("radius must be between 0 and 1000 inclusive")
self.radius = radius