You need to use multiple accessors. Consider this:
// Assembly A
public class ClassA
{
protected int someInt = 1;
private void DoSthmWithA()
{
someInt = 10;
}
}
// Assembly B
public class ClassB : ClassA
{
private void DoSthmWithB()
{
someInt = 11;
}
}
[TestMethod()]
public void Testing
{
var target = new ClassB();
var poA = new PrivateObject(target, new PrivateType(typeof (ClassA)));
var poB = new PrivateObject(target);
var accA = new ClassA_Accessor(poA);
var accB = new ClassB_Accessor(poB);
accA.DoSthmWithA();
Assert.AreEqual(accA.someInt, 10);
accB.DoSthmWithB();
Assert.AreEqual(accA.someInt, 11);
}
or
[TestMethod()]
public void Testing
{
var target = new ClassB();
var poA = new PrivateObject(target, new PrivateType(typeof(ClassA)));
var poB = new PrivateObject(target);
poA.Invoke("DoSthmWithA");
var accA = new ClassA_Accessor(poA);
Assert.AreEqual(accA.someInt, 10);
poB.Invoke("DoSthmWithB");
Assert.AreEqual(accA.someInt, 11);
}