The PrivateType class is very handy when it comes to run unit tests on methods that are either private, either in an internal class.

The constructor signature is:

public PrivateType(
	string assemblyName,
	string typeName
)

You use it this way:

PrivateType t = new PrivateType("Myassembly", "Myassembly.MyNamespaces.MyInternalClass");

MyType result = t.InvokeStatic("MyMethod") as MyType ; // MyType  can be any object type

But when you are in the specific case of testing a method from an nested class of an internal class, there is a little trick

The TypeName argument of the PrivateType’s constructor is not (as we could imagine) “Myassembly.MyNamespaces.MyInternalClass.MyInnerClass” but “Myassembly.MyNamespaces.MyInternalClass+MyInnerClass” (notice the “+”)

So :

PrivateType t = new PrivateType("Myassembly", "Myassembly.MyNamespaces.MyInternalClass+MyInnerClass");

MyType result = t.InvokeStatic("MyMethod") as MyType ; // MyType  can be any object type

Help found thanks to :https://stackoverflow.com/questions/3200875/how-to-instantiate-privatetype-of-inner-private-class/22700890#22700890

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