ConsoleApplication.cs

using Moq;

namespace ConsoleApplication15
{
    public class Documents
    {
        public string Abc { get; set; }

        public Documents()
        {
            
        }

        public Documents(string abc)
        {
            Abc = abc;
        }
    }

    public interface IDocumentRepository
    {
        Documents GetDocuments(
            int projectPK,
            int? folderPK,
            bool useFolders,
            string search,
            int user,
            int page,
            int pageSize,
            string customerConnectionString);
    }

    public class DocumentsController
    {
        public IDocumentRepository DocumentRepository { get; private set; }

        public DocumentsController(IDocumentRepository documentRepository)
        {
            DocumentRepository = documentRepository;
        }

        public Documents GetDocuments(int projectPK, int? folderPK, string search, int page, int pageSize)
        {
            Documents documents =
                DocumentRepository.GetDocuments(
                    projectPK,
                    folderPK,
                    true,
                    search,
                    55, //saved in HttpConfiguration
                    page,
                    pageSize,
                    "CustomerConnectionString" //saved in HttpConfiguration
                );

            return documents;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var repositoryMock = new Mock<IDocumentRepository>(MockBehavior.Strict);
            repositoryMock
                .Setup(
                    c => c.GetDocuments(
                            It.IsAny<int>(),
                            It.IsAny<int?>(),
                            It.IsAny<bool>(),
                            It.IsAny<string>(),
                            It.IsAny<int>(),
                            It.IsAny<int>(),
                            It.IsAny<int>(),
                            It.IsAny<string>()
                        )
                )
                .Returns(new Documents("it works"));

            var documentsController = new DocumentsController(repositoryMock.Object);

            var response =
                    documentsController.GetDocuments(
                            It.IsAny<int>(),
                            It.IsAny<int?>(),
                            It.IsAny<string>(),
                            It.IsAny<int>(),
                            It.IsAny<int>()
                    );

            //response.Abc == "it works"
        }
    }
}