测试一个类是否有属性？

I'm trying to do a little Test-First development, and I'm trying to verify that my classes are marked with an attribute:

我正在尝试进行一些Test-First开发，我正在尝试验证我的类是否标有属性：

[SubControllerActionToViewDataAttribute]
public class ScheduleController : Controller

How do I unit test that the class has that attribute assigned to it?

如何对该类具有分配给它的属性进行单元测试？

4 个解决方案

#1

102

check that

检查一下

Attribute.GetCustomAttribute(typeof(ScheduleController),
    typeof(SubControllerActionToViewDataAttribute))

isn't null (Assert.IsNotNull or similar)

不为null（Assert.IsNotNull或类似）

(the reason I use this rather than IsDefined is that most times I want to validate some properties of the attribute too....)

（我使用它而不是IsDefined的原因是大多数时候我想要验证属性的某些属性....）

#2

The same you would normally check for an attribute on a class.

您通常会检查类的属性。

Here's some sample code.

这是一些示例代码。

typeof(ScheduleController)
.IsDefined(typeof(SubControllerActionToViewDataAttribute), false);

I think in many cases testing for the existence of an attribute in a unit test is wrong. As I've not used MVC contrib's sub controller functionality I can't comment whether it is appropriate in this case though.

我认为在许多情况下测试单元测试中是否存在属性是错误的。由于我没有使用MVC contrib的子控制器功能，我无法评论它是否适合这种情况。

#3

It is also possible to use generics on this:

也可以在此使用泛型：

var type = typeof(SomeType);
var attribute = type.GetCustomAttribute<SomeAttribute>();

This way you do not need another typeof(...), which can make the code cleaner.

这样您就不需要另一种类型（...），这可以使代码更清晰。

#4

I know this thread is really old, but if somebody stumble upon on it you may find fluentassertions project very convenient for doing this kind of assertions.

我知道这个线程真的很老，但如果有人偶然发现它你可能会发现fluentassertions项目非常方便做这种断言。

typeof(MyPresentationModel).Should().BeDecoratedWith<SomeAttribute>();

#1

102