[InternalsVisibleToAttribute] for Unit Testing Private Methods

One of the unit testing challenge developers face is – How to Test a Private Method?

Solution: Use InternalsVisibleToAttribute method in .Net Core

// Enter the Assembly Name of the Unit Test project

// Use internal modifier instead of private

[assembly: InternalsVisibleToAttribute(“UnitTestProject1”)]

namespace ConsoleApp7


public class IndustryBL
internal int InternalMethod(int x, int y)
return x + y;


Now we can Invoke the method from Unit Test.

namespace UnitTestProject1

public class UnitTest1
public void TestMethod1()
IndustryBL bl = new IndustryBL();
bl.InternalMethod(2, 3);



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