How to de-route dll calls?

Question

I have the following piece of code which needs to be unit tested:
namespace namespace1
{
public class A {
public void method( B obj) {
}
}
}

class B definition is something like this:
namespace namespace1
{
internal class B {
private MyWrapper myWrapper;

    public B() {
        this.myWrapper = new MyWrapper();
    }
}

}

Here MyWrapper class is in wrapper.dll file which needs to be faked,
namespace namespace2
{
public class MyWrapper {
public MyWrapper();
}
}

So far I tried creating shims for wrapper.dll. But the actual wrapper.dll cannot be accessed/referenced so I am getting a file not found exception.

Is there a way to de-route the 'new MyWrapper();' call?

Answer 1

Hi, @NewCodee

Welcome to Microsoft Q&A!

I created a project with reference to the code you provided, but the method (B obj) of class A will throw a compilation exception CS0051.
Can your code run before unit testing? According to this document, The return type and parameter types of a method must be at least as accessible as the method itself.
You can try to modify the access modifier of class B before unit testing.

Sincerely,
Peng
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