How to divert “non public” method in public class moles

Question

I have a public method that uses a local private method to get data from the Db.

private string SomeMethod(string) { ... Doing some operations ... string data = GetDBData(string); Doing some operations ... }

I want to divert/isolate the private method GetDBData(string) using moles so my test will not require the DB.

Obviously, my question is: how to do it? thank you Uria

EDIT
Additional information:

i tried to change the method accessors both to public and internal protected, in both cases i can now see the methods as moles. BUT when running the test, the original method is still being used and not the detour I've implemented in the PexMethod.

Answer 1

I figured it out

If i have the public MyClass with private SomeMethod

public class MyClass
{
    private string SomeMethod(string str){}
}

if you want to mole the SomeMethod method you need to use AllInstances in the test method:

[PexMethod]
SomeMethod(string str)
{
    MMyClass.AllInstances.SomeMethod = (instance, str) => { return "A return string"; };
}

• notice that the lambda receives an instance parameter as the first parameter. I'm not sure what it's function is.

Answer 2

You can try any of the following.

• Make the method internal and add an attribute like this to the assembly:

  [assembly: InternalsVisibleTo("<corresponding-moles-assembly-name>")]

• Change the method access to protected virtual and then use a stub.

• Refactor your class so that it gets an interface (IDataAccessObject) as a constructor parameter, SomeMethod being one of the methods of that interface, and then pass a stub of that interface to your class in test methods.