How to change default path in Nunit test?

Question

C++ / C#

Hello.
Nuyuans in the following:
There is a method which eats string of a file name of a certain project.

...
   var actual = obj.LoadProject("UnitTest");
            Assert.AreEqual(expected, actual);

During standard program operation, even in Debug or exe mode , part of the code calls Directory.GetCurrentDirectory() + part of the path in hardcode (yes, it is necessary) to determine the path.
Usually there is a creation in Debug on D: \ project \ project \ * (the desired file)

The problem appears at the start of the Nunit test, it generally goes to drive C and in the user's directory. After some googling, I realized that there is a json file somewhere where these paths are possible. So I wanted to know how to win it? Because the tests will be run not only on my local PC.

The error itself:

Answer 1

Until then, this is the solution. Recognize the method as "not testable".
But the method is well tested in the negative)