How to use Moq to simulate exceptions thrown by the StackExchange.Redis library?

I'm working on a project where I would like to use the StackExchange.Redis library to connect to a Redis database. In addition, I'd like to use Moq for the mocking library in our unit tests, but I'm running into a roadblock that I need some help to resolve.

My specific issue, is that I have a command/response architecture and I'm trying to test a cache "wrapper" that checks if a command can be satisfied by the cache before doing the actual work to return the response. An important consideration is that cache failures should never stop a request from being handled, so I want to to mock out certain failures for the StackExchange.Redis IDatabase interface. However, I can't seem to figure out how to throw a RedisException from my mocked object. For example, I'd like to just use the following code, but it doesn't compile because there's no public constructor for the exceptions thrown by this library.

    Mock<IDatabase> _mockCache = new Mock<IDatabase>();

    // Simulate a connection exception to validate how the cache layer handles it
    //  THIS DOESN'T COMPILE THOUGH
    //
    _mockCache.Setup(cache => cache.StringGetAsync("a", CommandFlags.None)).Throws<RedisException>();

Is there a better way to mock up failures within the StackExchange.Redis library? I feel like I'm missing something obvious either with Moq or with how to test against this library.