Default Java accessibility is package and it's a known practice to put production classes and test-cases in the same package structure for testing package methods.

We translate package accessibility to similar protected internal but internal accessibility refer to assemblies. In .Net, developers usually put test-cases in a different project (assembly) from production classes. However, test-cases namespace will be same as production classes, they couldn't access 'protected internal' members.

We translate these calls to use Reflection.

[Java]

package project.core;
public class Shape
{
        int method(int a, int b)
        {
                return 0;
        }
}

package project.core;
public class ShapeTest extends TestCase
{
    public void testMethod()
    {
        Shape shape = new Shape();
        assertEquals(0, shape.method(0, 1));
    }
}

[C#]

namespace Project.Core
{
        public class Shape
        {
            protected internal int method(int a, int b)
            {
                return 0;
            }
        }
}

namespace Project.Core
{
    [TestFixture]
    public class ShapeTest
    {
        [Test]
        public void testMethod()
        {
            Shape shape = new Shape();
            assertEquals(0, Helpers.ReflectionHelper.CallInternalMethod("method", shape, new object[] {0, 1}););
        }
    }
}