I discovered today the "Object Test Bench" : pretty interesting for quickly testing some classes .
Unfortunatly (and I don’t understand why) , this can only be used in Visual C#, not in VB.net.
Here is how to use it:
In the class View, right click on a class, select "create instance".
The Object Test Bench window will be visible with a instance of the select class (an object); on this window, right click on this object, select ("Invoke method") a method to test and provide the value for the matching parameters; select save value.
This doesn’t replace unit testing, but is convenient anyway…