How to simulate throwing an exception in Unit tests?

Question

How can I simulate an exception being thrown in C# unit tests?

I want to be able to have 100% coverage of my code, but I can\'t test the code with exceptions that may oc

Answer 1

You need to create a mock object that stands in for the real objects that can throw these exceptions. Then you can create tests that simply are something like this:

public void ExampleMethod()
{
    throw new OutOfMemoryException();
}

If you are using a dependency injection framework it makes replacing the real code with the mock code much easier.