Python-测试属性引发异常 [英] Python - test a property throws exception

问题描述

给出:

def test_to_check_exception_is_thrown(self):
    # Arrange
    c = Class()
    # Act and Assert
    self.assertRaises(NameError, c.do_something)

如果do_something引发异常，则测试通过.

If do_something throws an exception the test passes.

但是我有一个属性，当我用c.name = "Name"替换c.do_something时，我收到一条错误消息，提示我的测试模块未导入，并且Eclipse突出显示了等号.

But I have a property, and when I replace c.do_something with c.name = "Name" I get an error about my Test Module not being imported and Eclipse highlights the equals symbol.

如何测试属性会引发异常?

How do I test a property throws an exception?

setattr和getattr对我来说是新手.在这种情况下，他们当然有所帮助，谢谢.

setattr and getattr are new to me. They've certainly helped in this case, thanks.

推荐答案

assertRaises需要可调用的对象.您可以创建一个函数并将其传递:

assertRaises expects a callable object. You can create a function and pass it:

obj = Class()
def setNameTest():
    obj.name = "Name"        
self.assertRaises(NameError, setNameTest)

另一种可能性是使用setattr:

self.assertRaises(NameError, setattr, obj, "name", "Name")

您的原始代码引发语法错误，因为赋值是一条语句，不能放在表达式中.

Your original code raises a syntax error because assignment is a statement and cannot be placed inside an expression.

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