Just a quick post now that I'm back from a Christmas break.
One of the tests that I always write in my applications is one to check that my IoC container is configured properly. This is something that is often neglected and I'm not sure why.
It's just as case of writing a test (or tests) to try and resolve every 'entry point' class in your application. For example, in an MVC application you would test that each controller can be resolved. Any dependency that hasn't been registered in the IoC container will then cause a test failure, informing you at compile-time that you have an issue (rather than it rearing its head at runtime).
To take it to the next level of detail you could have a set of tests that verify that each registered depenedency resolves to the correct type, however I've never felt the need to take it this far.
