Ability to mock that a function throws an Error #67

I haven't found this anywhere and I feel like the library should handle this. I even looked at open and closed tickets but couldn't find this functionality.

I'd like to be able to have my mocked dependencies throw exceptions, for example:

const calculatorMock = Substitute.for<Calculator>();
calculatorMock.add(1, 1).throws(new Error('error message'))

Is there any reason why this is not supported?