Assert.WillRaise should use inheritance check instead of equality check about dunitx

[staticcat]

I wonder if being more verbose here would fix the issue. It would also mean reading the tests would clearer. I suggest:

class procedure WillRaise(const AMethod : TTestLocalMethod; const exceptionClass : ExceptClass; const msg : string = ''); overload;
class procedure WillRaiseDescendant(const AMethod : TTestLocalMethod; const exceptionClass : ExceptClass; const msg : string = ''); overload;
class procedure WillRaiseAny(const AMethod : TTestLocalMethod; const msg : string = ''); overload;

Also should the Assert.CheckExceptionClass() procedure be changed to have its gate condition to throw an invalid argument exception?

[vincentparrett]

If you are checking that a method throws an exception under certain circumstances, then you are probably expecting a specific exception, in which case, the current WillRaise behaviour is correct. Jason's idea has merit though, and would be backwards compatible.

[LarsFosdal]

Jason's approach is satisfactory.

[rlove]

Lars, hopefully my changes will work for you.