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We can use hasattr() function to find if a python object obj has a certain attribute or property. hasattr(obj, 'attribute'): The convention in python is that, if the property is likely to be there, simply call it and catch it with a try/except block.
If you want to determine whether a given object has a particular attribute then hasattr() method is what you are looking for. The method accepts two arguments, the object and the attribute in string format.
To check if an object in python has a given attribute, we can use the hasattr() function. The function accepts the object's name as the first argument 'object' and the name of the attribute as the second argument 'name. ' It returns a boolean value as the function output.
Python hasattr() Function The hasattr() function returns True if the specified object has the specified attribute, otherwise False .
check that
Attribute.GetCustomAttribute(typeof(ScheduleController),
typeof(SubControllerActionToViewDataAttribute))
isn't null (Assert.IsNotNull or similar)
(the reason I use this rather than IsDefined is that most times I want to validate some properties of the attribute too....)
The same you would normally check for an attribute on a class.
Here's some sample code.
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.
It is also possible to use generics on this:
var type = typeof(SomeType);
var attribute = type.GetCustomAttribute<SomeAttribute>();
This way you do not need another typeof(...), which can make the code cleaner.
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.
typeof(MyPresentationModel).Should().BeDecoratedWith<SomeAttribute>();
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