Is it important to unit test a constructor?

Question

Ought I to unit test constructors? Say I have a constructor like this:

IMapinfoWrapper wrapper;
public SystemInfo(IMapinfoWrapper mapinfoWrapper)
{
    this.         


        

Answer 1

I think the answer to this is "Yes".

There's plenty of code out there which assumes, horribly, an initialised object state, instead of a null reference - often when there are no explicit values assigned in the constructor.

I am happy to have constructor tests break to alert me when initialised public member values have been changed. This is about defensive testing - I'm pragmatic, and happier to have tests than not, and remove them when they're shown to not be helpful or useful.