WCF Service Test

WCFServiceTest.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
using ElmSelect.DomainModel;
using DataAccessLayer;

namespace WCFService
{    
    public class ElmResourcesService : IElmResourcesService
    {
        readonly IQueryable<School> _schools;
        readonly IQueryable<Lender> _lenders;

        public ElmResourcesService(IQueryable<School> schools, IQueryable<Lender> lenders)
        {
            _schools = schools;
            _lenders = lenders;
        }

        public IList<string> GetSchools(string partialText)
        {
            return _schools.Where(x => x.Name.Contains(partialText)).Select(x => x.Name).ToList();
        }

        public School GetSchool(string schoolName)
        {
            return _schools.SingleOrDefault(x => x.Name == schoolName);
        }

        public IList<string> GetLenders(string partialText)
        {
            return _lenders.Where(x => x.Name.Contains(partialText)).Select(x => x.Name).ToList();
        }

        public Lender GetLender(string lenderName)
        {
            return _lenders.SingleOrDefault(x => x.Name == lenderName);
        }
    }
}

namespace WCFService.Test
{
    class FakeSchools : List<School>
    {
    }

    class FakeLenders : List<Lender>
    {
    }

    [TestFixture]
    public class WCFServiceTests
    {
        [Test]
        public void GetSchools_PartialTextMatch_ListOfSchoolsWithPartialMatch()
        {
            //Arrange
            var schools = new FakeSchools(new[]{new School("Ohio State University"), new School("Florida State University")});
            var service = new WCFService(schools, null);

            //Act
            var result = service.GetSchools("Ohio");

            //Assert
            CollectionAssert.AreEquivalent(new[] {"Ohio State University"}, result)
        }
    }
}

functionally equivalent to what you were doing, but without the potential NullReferenceExceptions from the Try/Finally stuff.

When you instantiate your ElmResourcesService, you give it 2 enumerations of strings. These can be anything from an array to a not-yet-materialized LINQ-to-SQL, EF, or NHibernate enumerable.

technically, to compile, you probably need to instantiate new lists from the ILists