Checking constructor arguments passed via `Substitute.For`/`Substitute.ForPartsOf`

[dtchepak]

Using an analyser for this came up in NSub#314, so I thought I'd raise this issue here for discussion and to see how practical it would be to implement.

[tpodolak]

I took an initial look at this one, and as for today I think I know how to write analyzer which prevents you from using

• ForPartsOf on delegates and interfaces
• ForPartsOf/For without arguments if there is no parameters constructor
• ForPartsOf/For with wrong arguments if there is only one constructor and you pass the parameters directly (not via new [] { arg1, arg2, arg3 }) - this one is tricky but probably possible

The real problem for me will be situation when your class has multiple constructors and then I have to figure out proper overload to choose based on arguments user provided. I didn't find any public API in Roslyn which would do that for me, so this particular feature might not be implemented.