Do we mock a class from a different library imported from nuget package?

I'm fairly new to unit tests. I wanted to know that my method uses a static class from a library imported from nuget package. So it validates a model that was passed and if invalidated it returns back a exception. How do I unit test this? Do I have to mock that static class? It does not have a interface either. So its simply like this Validateblah.Validateblahblah where the first is a class and second is a method

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